| ArjenShenzhen |
I do have good news my fellow DIYers,
I will soon be selling a new Design TA3020 board that sports around 150 to 200 Watts per channel, ive been testing it these weeks and i do LOVE the sound of it.
When everything is done i will post photo's. This will be as all my boards are a fully finished PCB, all you nee to do is connect it to the PSU/Speakers/source.
Greetings,,
Arjen |
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| dede |
Great news,
Could we have some details on it?
Regards anthony |
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| ArjenShenzhen |
As soon as testing is finished and i have chosen the best mosfets i will post all the specifications online.
This will be soon!
With thanks to my friend Cristy for designing and advice help ! your a great engineer!
Greetings,
Arjen Helder |
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| v-bro |
Hi, funny, it's the same for me, I'm working on a 2x500W version and also on a moderate power version....
I'm testing with them, so it can still end up in a 'back to the drawingboard' situation.
It's a great chip and I am glad the availability is still good. |
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| dede |
Hi,
Did someone try the TA3020 with input transformer for balanced operation ?
Regards
Anthony |
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| v-bro |
Nope, but I did with the TC2001...
I used Neutrik transformers here... NTE4, but I've also had good experiences with NTL1 and OEP A262A2E, Amplimo, Lundahl...... |
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| nicoch46 |
| tripath party ? nice :D |
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| nicoch46 |
after one year I love this amp......
now a new Mr Borbely phono sound soo good ....need to try an amp just to see if........
cd no thanks! |
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| dede |
| quote: | Originally posted by v-bro
Nope, but I did with the TC2001...
I used Neutrik transformers here... NTE4, but I've also had good experiences with NTL1 and OEP A262A2E, Amplimo, Lundahl...... |
Interesting :) what's your favourite ? |
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| xaudiox |
any updates ArjenShenzhen? :D
Been wanting to try the TA3020 in a long time now..
thanks |
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| v-bro |
| quote: | Originally posted by dede
Interesting :) what's your favourite ? |
Lundahl LL1592 is really great, but although some give bad raps about them I love the OEP A262 series transformers. The Neutrik are great because they are very small and very affordable AND still formidable quality... I have tested most of them on a Neutrik A1 audio analizer and most manufacturers are quite honest in their spec sheets (like freq. response..)
In general Lundahl makes the best transformers.... |
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| dede |
Hi,
Indeed the Lundahl LL1592 look great but the price :bawling: i don't know how much the ta3020 module will cost but it's probably cheaper to bridge them than to use the lundahl.
Does a passive pre amplifier could work well with this kind of transformer ?
Anthony |
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| col |
I'm using TAA4100A with the Nuetrik NTE1 to get balanced inputs. They were very reasonably priced and sound great. I had to build a metal box to enclose them, soldered them onto the backs of the XLR connectors.
http://pix.minirig.org.au/main.php?g2_itemId=339
col. |
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| v-bro |
| quote: | Originally posted by dede
Hi,
Indeed the Lundahl LL1592 look great but the price :bawling: i don't know how much the ta3020 module will cost but it's probably cheaper to bridge them than to use the lundahl.
Does a passive pre amplifier could work well with this kind of transformer ?
Anthony |
Well I was lucky I didn't have to pay them myself, but was unlucky the preamp I built with them wasn't for me either...:(
You can certainly build a passive pre with transformers and like Col said the Neutrik have excellent specs too and are really well affordable... You can always upgrade later when you may ever win the lottery ;) |
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| col |
Arjen,
I am very interested in your new TA3020 design. I am in the market to build another amp now. I want something that is class D and around similar spec to a UcD180. Will your design use a dual rail 45v power supply? I already have all the components for that. I'm hoping to just buy the modules to complete a stereo amp. With the economic situation a UcD180 is almost %40 more expensive than when I last bought one.
col. |
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| dede |
| quote: | Originally posted by ArjenShenzhen
As soon as testing is finished and i have chosen the best mosfets i will post all the specifications online.
This will be soon!
Arjen Helder |
Any news ? |
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| v-bro |
Guys, I already got mine working, not to full satisfaction yet, a few minor changes need to be done and it's ready to release...
I'll post here when it's available...
(I'm talking about a design with dual to220 fets in the power stage and ready made inductors, power supply on board so only a transformer is necessary.. Operating voltage depending on voltage sensing resistors will be between +/-20Vdc and +/-60Vdc, power will be about 200W/ch...) |
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| dede |
Hi,
Sound nice, it will be a commercial product ?
Regards
Anthony |
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| col |
OH no, please don't put the power supply on board. I like to keep them separate and build my own with my preferred rectifiers and caps.
col. |
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| v-bro |
Hi, yes it'll become a commercial product at a really favourable price...
Hey Col don't panic, you don't HAVE to use the on board power supply...;) |
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| v-bro |
| By the way nice supply, but +/-75Vdc will be too high and +/-30Vdc is a bit low... |
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| dweekie |
| How would it compete sonically with a Truepath? Is your goal to make a cheaper, easily accessible version or a comparative alternative? |
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| dweekie |
| quote: | Originally posted by v-bro
By the way nice supply, but +/-75Vdc will be too high and +/-30Vdc is a bit low... |
They custom make all voltages to your liking, with the default being 60V for the Truepath. It was the specific smps discussed in the 41hz forums (http://www.41hz.com/Forums/topic.asp?TOPIC_ID=1946). |
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| dede |
| quote: | Originally posted by v-bro
Hi, yes it'll become a commercial product at a really favourable price...
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Good news, i could stop stalcking the guy selling a second hand bel canto evo
Could we get an idea of price and availabilities ? My 7 channel amplifier still don`t know wich part it will be made of ;)
Regards
Anthony |
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| ArjenShenzhen |
Hi there Fellow DIYers,
Ive ordered the first 20 pieces now, and it will take about one week before there done.
Exact specs will be posted after ive tested the first production units, i still need a 60+60 volts powersupply!! so sofar ive only tested at 30+30 volts.
This is why the specs have not been posted yet.
Greetings,
Arjen Helder |
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| v-bro |
| The THD+N will be lower than Truepath in the regions above 1Khz... |
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| v-bro |
Nope, it's something entirely different... It's much smaller in the first place, it has numerous PCB holes to fit all kinds of input caps (like on the AMP11). It's got 5V and VN10 supplies on board, but of course they can also be done externally when this is preferred...
Can't tell much more because it's not released yet... |
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| Havoc08 |
Hi V-bro
Sounds exciting :)
Just joined diyaudio and stumbled across this thread. Looking forward to seing pictures of your kit. |
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| col_s |
Looks interesting v-bro. Having all power supply components on-board has a lot of advantages. The TA3020 Bel Canto had all power supply components other than mains filtering and soft start located on the amplifier board:
http://www.belcantodesign.com/pdfs/eVo_architecture.pdf
It makes it easier and cheaper to build a multi-channel amplifier or run two amps in bridged mode.
It would be nice to also provide some sort of speaker protection and silent on-off as this is another thing that needs to be added to the truepath with external boards.
A two channel truepath build with all the power supply components and speaker protection takes up a lot of real estate inside the case. It looks nice though :) |
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| BWRX |
| quote: | Originally posted by v-bro
The THD+N will be lower than Truepath in the regions above 1Khz... |
Do you have performance data to back up this claim or are you just speculating? |
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| ArjenShenzhen |
Ladies and Gentleman,
Finally im done with testing, and from now on ready for ordering,
The TA3020 Fully Finished amplifer PCB.
The following specs,
-Supply voltage, 30-60 Volts
Output power, at 60 volts supply voltage:
- 300 Watt at 4 Ohms
- 150 Watts at 8 Ohms
At more normal power levels,
- 0.02% THD+N @ 50W, 8Ù
- 0.03% IHF-IM @ 30W, 8Ù
The Powersupply needs 2 X 60 volts, and does not need any other voltages.
Later today i will add a photo of the PCB ( im still @ work )
Price is the equalivant of 1000 RMB, or 117 Euro at the current ratings, for a fully finished and tested PCB. |
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| v-bro |
Congratulations Arjen!
| quote: | Originally posted by BWRX
Do you have performance data to back up this claim or are you just speculating? |
Measured of course!
More features are
-jumper to choose between star ground or full ground planes.
-fets and rectifier diodes are all faced downwards so the whole amp can be bolted to a heatsink with large flat surface, this makes it ideal to use as a plate amp.
-traces towards the fets are EXTREMELY short.
-all electrolytic caps will be very low impedance and long life.
-just a transformer with double voltage is needed. |
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| dede |
Nice,
It will be difficult to choose beetween your product:
Do you have the input impedance ?
Is it possible to bridge them for a balanced input ?
Regards
Anthony |
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| ArjenShenzhen |
What a amazing coincidence, two Dutchman, one in China, one in Holland both with the same IC, and comparable design.
The PCB here is also a Flat design that cools al the mosfets and the TA3020 on one heatsink, and it bearly gets even warm, even at high power i have let it run without any heat sink at all, without it getting hot. i didnt expect this, nor reccomend this, but this is one " green " amplifier!
As for the specs, yeah, gotta admit, there guessed, i measured the output power for as far as i could, ( speakers started to get a bit smelly and ears started bleeding ;-)
And if there is anyone who has such equipment to measure output power and THD levels at different output power and load.... im your new friend, please help me get it tested :-)
Other than that, here is the photo, more photo's will follow as soon as i have the time taking them.
Greetings from the far east,
Arjen Helder |
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| john65b |
| quote: | | Price is the equalivant of 1000 RMB, or 117 Euro at the current ratings, for a fully finished and tested PCB. |
Please excuse the question, but just PCB or fully populated with all components including heatsink? Is the PCB stereo or single channel?
Sorry to ask |
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| ArjenShenzhen |
The PCB is fully finished, thus populated and tested, and includes the heatsink.
its the stereo version, but with some small mods it can also be bridged.
all you need are:
- 2 X 60 volts powersupply
- Housing and connectors
- Speakers
- CD player or other source |
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| fabioch |
Hi Arjen this is Fabio ... maybe I'll go for this one too...
It´s tempting me, and easy to hide from the wife too.
Nice work if you can get it. |
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| ArjenShenzhen |
Does it help to say that my girl loves the sound of it ? :-)
She even helps assamble them! hahah
not to worry ill give you the photo's tomorrow and put some more info online. just have been too busy last days so im too tired to actually think.....
im also making PDF files for all different PCB's i have to make sure everyone is well informed and knows how to use and modd them.
ive also bought some empty inductor " rods " if you will, to wind my own coils. im listning to the TA2020 now whil using them. the amp seems a bit more stabile and it reduced the resistance in the outpout stage with about 50 milli ohms. they keep stone cold, so i think the losses in the coils are very low.
Anyways, feel free to pre-order, as the first lot is only 10 pieces and ive got quite some requests. no need to pay in advance, and first come fist serve.
Greetings from my un-heated house at 14 degrees in Shenzhen. Brrrr..... |
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| revintage |
Hello Arjen,
Got the 2020s thank you.
About the 3020 I suppose one need to add a 2*30V up to 2*60V DC supply, not only transformer?
Are the inputs easy accessable as I want to remove the input caps for transformer input? |
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| col |
117 Euro is around AUD$228 that is $20 short of the price of 2 x Hypex UcD180. It's over priced and under tested. :whazzat:
col. |
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| ArjenShenzhen |
Hi there lars, hope your happy with them, ive been playing with the TA2020 just now, adding some bigger coils, 1.3mm wire, ill show that somewhere else.
The TA3020's inpu caps are just under the heatsink, this might make soldering the trannies to the PCB hard. i suggest you just short it, and connect the input transformer to the input connector.
Ill show it to morrow with more photo's
Greetings,
Arjen ( its still cold... ) |
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| ArjenShenzhen |
Hi there Col,
Tue, defenetly undertested, aldoh the design is not much different from the Tripath Application notes and those are tested designs that work Very very well. anyways, this always comes down to personal taste and to measurements, if there is somone what wants to help me measure the preformance of this board, it will be rewarded by me and we will all know more.
I have how ever tested the amp, and i really do like it allot. but this is nothing more than a personal opinion.
If anyone could help out testing, i would really appriciate it, and where it comes to pricing, yes 117 Euro is allot, but its also allot of time and money that go's in to these projects, and it should be worth while to do so. I personally dont know many people that dont mind turning there living room in to a small factory, therfore i do thank god for giving me a girlfiend that does not complain about this :-D
Greetings from China,
Arjen |
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| v-bro |
Hi all,
the design I'm working on has ready made inductors which are fully shielded, the PCB has a full copper pour and as said a star ground right under the chip, but the option to go for full ground planes. It is a design done by several people, I'm just one of them and all I can say is I'm VERY impressed by the soundquality and neat lay-out.
The design is quite different from the Tripath evaluation boards.
Say Arjen, what BBM timing is your's set to? |
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| ArjenShenzhen |
Hi there V-bro,
The PCB has multiple settings, 40-80-120 ns so its adjustable with a solder bridge.
Page 22 of the datasheet shows the table.
Im working now on some better coils, bought some shieldable core inductors and some good quality copper.
time to toy this weekend!
Greetings and have a nice weekend there in Amsterdam!
Arjen Helder
China |
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| nicoch46 |
HI All
this are not commercial place...... |
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| revintage |
| quote: | | 117 Euro is around AUD$228 that is $20 short of the price of 2 x Hypex UcD180. It's over priced and under tested. |
How can you know if its overpriced if you haven´t tried or tested it? It might sound better than the UcDs.
As I understand it you build amps with Ucd modules for others, is this the reason for your sour comment?
Please administrator move all threads concerning trading to Vendors Bazar. |
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| col |
I build amps for my friends. Not commercially. Maybe the amp isn't overpriced, just I was expecting it to be much cheaper than a pair of UcD180. Doesn't really matter anyway. I wish Arjen all the luck in his endevour :D
col. |
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| revintage |
Hi Col,
Sorry, maybe I overreacted:clown:!
Anyway, I have seen test both in favour of UCD180 and Tripath3020 based amps, so probably its just a matter of taste.
I see no reason why a Truepath style should be cheaper than the UcDs as the first seems to sound at least as good. |
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| ArjenShenzhen |
Hi there Guy's,
sorry if i annoy anyone with comercialized posts, its not my intention to annoy, but more to enjoy DIY audio and value electronics,
Its of no doubt money is made on modules that are sold, but in the end it really isnt that simple to make it, and the amount that is made is not in comparison with the time spend.
The time that go's in sourcing and QC, especially here in China where 90% of the trades doesn't want to trade if you want less than 1000 parts, all the fake and used ***** etc, is allot, and im lucky to speak the language and be able to test all components at the company i work for.
all that added up together, i make allot less on selling PCB's then i do with working for my boss per hour and all my cosumers can be thankfull to my Girlfriend that helps me do logistics and packaging in her free time or i would not be able to do this at all.
That beeing said, this thread is about the TA3020, and that is what i am trying to discuss here aswell, hopefully to improve the existing design from what i can learn here and ofcource to enjoy myself in the process.
Price and product things i will post on the market place, discussion about the board as it is, i will post here.
Greetings,
Arjen Helder
Shenzhen China |
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| Havoc08 |
@V-bro
Do you have a ball-park price for your Truepath?
Is it assembled or does it come as a kit you need to solder yourself? |
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| v-bro |
Hi,
I'm merely participating in the design of the amp, therefore I can't give cost estimates or date of release, nor can I tell where the amp will become available. This in order to prevent a frenzy of emails asking about it at the doors of the shop...
I can only speak about the design itself, nothing else.
I want to add that I'm not commercially involved in this myself, I have an excellent paying day time job and doing this purely as a hobby.
My estimate about the price? Depends very much on the eventual parts that are going to be used, but somewhere between 90 and 150 euro for a kit... |
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| revintage |
Hello Arjen,
About your nicelooking 3020 board:
Is it to be fed directly from transformer AC or do I have to add rectifier-bridge and caps too? |
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| v-bro |
| quote: | Originally posted by revintage
Hello Arjen,
About your nicelooking 3020 board:
Is it to be fed directly from transformer AC or do I have to add rectifier-bridge and caps too? |
Looking at the cap size it is fed by DC and still needs rectifiers and bulk caps.... |
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| ArjenShenzhen |
Thanks there Bro, thats right. :-)
it has caps on board, but needs more buffer after the rectifier. i didnt make a PCB for that yet, it might not be neccesary to do so, but ill decide that in a later stage. |
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| revintage |
Then it was as I thought. My reaction was about the tiny 3300uF.
No need for cap-board. Better to hardwire instead! |
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| john65b |
As far as the comparison to the UCD180 - the UCD180 is 180 wpc @ 4 ohm, the TA3020 is 300 wpc @ 4ohm...
Wouldn't a more fair comparison should be against a UCD400, which is nearly twice the cost of the UCD180?
I have a UCD400 and love it. I also have a crappy implementation of 5 channels of TA3020 (planned to tweak it). The 5 x TA3020 I have sounds OK, but UCD400 bests it in every way.
But again, a better implemented TA3020 design may be worth looking into... as I believe it is priced quite well at 117 euro... |
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| v-bro |
| quote: | Originally posted by john65b
As far as the comparison to the UCD180 - the UCD180 is 180 wpc @ 4 ohm, the TA3020 is 300 wpc @ 4ohm...
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The TA3020 isn't by itself, it drives fets and the power depends on them, you can squeeze out even more than 500W/ch with the right fets...
Arjen's board is not even 300W/ch, he posted the rated power earlier. Neither is the design I'm working on... Truepath however is and it compares quite well with my friend's UCD400...
My preference is still the Truepath, but it's a very close call... |
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| john65b |
| quote: | | The TA3020 isn't by itself, it drives fets and the power depends on them, you can squeeze out even more than 500W/ch with the right fets... |
I stand corrected...The TA3020 is more a Driver than a amp module like the UCD...
Looking to better compare the two Amp modules... |
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| v-bro |
| quote: | Originally posted by john65b
I stand corrected...The TA3020 is more a Driver than a amp module like the UCD...
Looking to better compare the two Amp modules... |
I think the multichannel amp you have does use the TA3020 to directly drive speakers not? |
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| ArjenShenzhen |
Hi there, V-bro,
Did you look at those IR Mosfets IRF6785MTR1PBF that can be used with a BBM of 0ns ? i want to order some, for a later board that is, because the package style of these things is far from suitable
here the link:
https://ec.irf.com/v6/en/US/adirect...=IRF6785MTR1PBF
They are quite strange mosfets, and parts express sells them for around 3¬4 USD per one at low QTY. |
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| ArjenShenzhen |
| i mean, have a look, this is odd stuff! |
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| dday_one |
| Sorry... wrong thread... |
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| v-bro |
Hey Arjen,
yes I have a few samples of them, but they are kinda hard to solder:( |
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| 232 |
Hot-plate, hot air, cold air :smash:
A TA3020 with DirectFET's sounds mojo!
(From AN-1035,
Rework guidelines
Modern rework stations for ball grid array and leadless
packages often use two heating stages. The first heats
the substrate, either with a conventional hot-plate or a
hot-air system. The second stage uses a hot-air
system for localized heating, often with the option of
unheated air for faster cooling of the solder
interconnections on the replaced device; this improves
the solder grain structure.) |
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| 232 |
| quote: | Originally posted by v-bro
-traces towards the fets are EXTREMELY short.
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BTW, say there will be room for air core inductors. :) |
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| v-bro |
Air core inductors?
I think I have found THE site for you here:
http://www.kosmic.us/access-acousticrevive.html
Joking...:clown:
Really aircore inductors have much better specs for anything under 20Khz, but to filter RF (up to 1,2Mhz in the case of a Tripath amp) it is absolutely much preferred to use something with a core to keep the EMI within boundaries. It is true that these inductors have a great influence on the audio quality, but don't just speculate that what's good for speaker filters is good for this task.
The inductors that are used on the design I am working on are custom value fully shielded dual inductors like the ones on several 41hz amps...but not SMD...
So there could be room for tweaking...there are two inductors in series per side, so there is room for one big one as well :)
The amp is VERY alive and kicking by the way! Not far away from a release now! |
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| 232 |
| quote: | Originally posted by v-bro
Air core inductors?
I think I have found THE site for you here:
http://www.kosmic.us/access-acousticrevive.html
Joking...:clown:
Really aircore inductors have much better specs for anything under 20Khz, but to filter RF (up to 1,2Mhz in the case of a Tripath amp) it is absolutely much preferred to use something with a core to keep the EMI within boundaries. It is true that these inductors have a great influence on the audio quality, but don't just speculate that what's good for speaker filters is good for this task.
The inductors that are used on the design I am working on are custom value fully shielded dual inductors like the ones on several 41hz amps...but not SMD...
So there could be room for tweaking...there are two inductors in series per side, so there is room for one big one as well :)
The amp is VERY alive and kicking by the way! Not far away from a release now! |
Sounds good. *Note to self, find a good reason (when the house practically already is full of Tripath stuff) to buy into these :D
I have this idea that wrapping the inductors in carbon fiber cloth might dampen and disperse much of the EMF.
How about a DirectFET version. :) |
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| v-bro |
Or silk :D Have you seen that on the bottom of the page that opens on that link? :D:D:D Absolutely hilarious!
I am VERY thinking of designing something with directfets! They just look too promising, plus I am still willing to bring the BBM timing down to lower than 80. So far that has never been possible due to overshoots... |
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| ArjenShenzhen |
Hey there Guy's
I think i we will not make any further changes to the PCB, so i will now post the photo's of the board, also i can pick up the coils today so all is looking real good.
have a look and let me know what you think.
Arjen |
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| 232 |
| quote: | Originally posted by v-bro
Or silk :D Have you seen that on the bottom of the page that opens on that link? :D:D:D Absolutely hilarious!
I am VERY thinking of designing something with directfets! They just look too promising, plus I am still willing to bring the BBM timing down to lower than 80. So far that has never been possible due to overshoots... |
40! 40! 40! 40! :D
How about intermittent layers of carbon and silk.
| quote: | Originally posted by ArjenShenzhen
Hey there Guy's
I think i we will not make any further changes to the PCB, so i will now post the photo's of the board, also i can pick up the coils today so all is looking real good.
have a look and let me know what you think.
Arjen |
The amp looks good, yet I have two Truepath amps to finish. After that I'm saving up for something with directfets in it, hopefully also using an all-digital signal path. |
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| ArjenShenzhen |
Ive tested the PCB at 40ns, and its not overheating at low power ( say 100 watts ) so i think it should not be a problem.
the direct fets look cool ill ask my friend if he wants to design something with them, but those parts are a bit expensive, and hard to solder. im sure i can find a way around it, but it might take a couple of months.
Greetings,
Arjen Helder |
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| 232 |
| quote: | Originally posted by ArjenShenzhen
Ive tested the PCB at 40ns, and its not overheating at low power ( say 100 watts ) so i think it should not be a problem.
the direct fets look cool ill ask my friend if he wants to design something with them, but those parts are a bit expensive, and hard to solder. im sure i can find a way around it, but it might take a couple of months.
Greetings,
Arjen Helder |
Best of luck, in particular with the direct fet project, should you go ahead with it :)
Is the BBM set by jumpers? |
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| revintage |
Hi Arjen,
The board looks great! |
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| Solve |
| What is BBM and what does it do to sound? |
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| ArjenShenzhen |
The BBM is the Brake Before Make timing,
If you have a H bridge, you dont want all mosfets to be switched on at the same time, because that means you short the rail voltage to ground, and blow up your mosfets.
Therefore, its better to make sure that just before one mosfet wants to switch on, the other one is properly switched off.
There fore they made the BBM timing, 40 or 80 or 120 milli seconds before one switches on and the other switches off to make sure there are no Shoot thrue currents that could damage the parts.
This means also that the eventual PWM wave form looks a bit different with a different BBM and the sound is also influenced by this, be it not very much. The PCB we designed has a minimum BBM of 40nS, but if you would use special mosfets, a BBM of 0 or no delay at all can be reached. this is more expensive in components and these components are very hard to solder, but its not impossible. IR has these mosfets and call's them DirectFET.
Hope that explains it to you. |
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| 232 |
Good price, very tempting :)
I wonder if the BBM setting can be pulsed, to enable fine adjustment. |
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| bnsbhat |
Hi Col,
Silly question, what are those three connectors close to TA3020 print on the board
+5v - 30 to 60v and -12v respectively? Could you point out to a Toroid which could supply all three?
TIA
S. Bhat |
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| col |
Probably better to let Arjen answer technical questions regarding this module. Well if it is his one anyway.
I would presume that the 3 connector blocks are the left and right speaker out and the center block the power rails. Signal in must be on the other side of the heatsink, obscured from view in that photo.
I also presume that this board only needs a dual 30-0-30 to 45-0-45 trafo but with the filter caps and rectifiers bringing the voltage up to a maximum of 60v+-. I'm hoping that 20000uF per rail should be fine.
col. |
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| bnsbhat |
| quote: | Originally posted by col
Probably better to let Arjen answer technical questions regarding this module. Well if it is his one anyway.
I would presume that the 3 connector blocks are the left and right speaker out and the center block the power rails. Signal in must be on the other side of the heatsink, obscured from view in that photo.
I also presume that this board only needs a dual 30-0-30 to 45-0-45 trafo but with the filter caps and rectifiers bringing the voltage up to a maximum of 60v+-. I'm hoping that 20000uF per rail should be fine.
col. |
Hi Col,
Thanks a lot for double quick reply. Have a look at post 72 on this thread which has a pic of Arjen's board. The other end of board has four double channels. Thought this would be two for audio in and two for audio out. Again assuming both the boards are same. Incidentally connexelectronic website says that board will be shipped from Hong Kong :)
S. Bhat |
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| col |
Hopefully, it will come with some instructions :)
col. |
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| bnsbhat |
| quote: | Originally posted by col
Hopefully, it will come with some instructions :)
col. |
Please do post your experience. Would like to build one too.
S. Bhat |
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| theAnonymous1 |
Just an FYI for anyone not willing to make an account just to check the total price.
$69.99 + 19.99 shipping + $13.30 for something called "FL TAX 19.0%" = $103.28 |
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| 232 |
| quote: | Originally posted by theAnonymous1
Just an FYI for anyone not willing to make an account just to check the total price.
$69.99 + 19.99 shipping + $13.30 for something called "FL TAX 19.0%" = $103.28 |
Do you think it would be workable to feed one of the BBM pins on the TA3020 with a PWM signal at say 1 MHz? |
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| cnx |
| quote: | Originally posted by 232
Do you think it would be workable to feed one of the BBM pins on the TA3020 with a PWM signal at say 1 MHz? |
why you would do that ? to overmodulate the carrier ? i would not suggest you to do this, since the result will be worst, possible fatal for MOS-FET's and IC. |
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| 232 |
| quote: | Originally posted by cnx
why you would do that ? to overmodulate the carrier ? i would not suggest you to do this, since the result will be worst, possible fatal for MOS-FET's and IC. |
Excuse this delayed reply. It was merely a question if the TA3020 might have a built-in 'hidden feature', for example, if the BBM1 was set at 1 and BBM0 was pulsed at 25/75 (1/0) duty cycle, would this give a deadtime of 30 ns? |
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| 232 |
Nice! I'm hoping for the SMT and DirectFET version :) |
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| tinitus |
| Looks good, but I am sorry they still arent monos |
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| 232 |
| Mono is easy by using the balanced signal from for example a DAC. |
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| tinitus |
| quote: | Originally posted by 232
Mono is easy by using the balanced signal from for example a DAC. |
Yeah, but it will hurt in respect of handling speaker impedance, which is 8 ohm as it is...in balanced the amp will see it as 4ohm, which it supposedly wont like, unless you lower voltage/output
But sure, its really neat as a stereo amp with onboard supply, which does have some attraction...and could be convenient in a multiamp setup, which means 2 x stereoamps offering 2 exstra channels fore free...man, how could I forget that, now Im really tempted :D |
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| Havoc08 |
Looks nice V-bro :)
How do you expect the sound quality would be compared to truepath which has seperate psu etc. ? |
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| 232 |
| quote: | Originally posted by tinitus
Yeah, but it will hurt in respect of handling speaker impedance, which is 8 ohm as it is...in balanced the amp will see it as 4ohm, which it supposedly wont like, unless you lower voltage/output
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Thermoelectric cooling might be an alternative also :c_flag: :) |
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