Hi bangla,
Nice work. Heat sink I feel is a bit small, how hot do they get?. Especially running it at recommended 160mA bias?
Also recommend you to twist the transformer wires as they run all the way across sensitive areas , for final build.
I used a 50k stereo MFR step pot , that solved all problems of hum and noise... Also I didn't install the ground lifter 10ohm resistor.
Reg
Prasi.
Nice work. Heat sink I feel is a bit small, how hot do they get?. Especially running it at recommended 160mA bias?
Also recommend you to twist the transformer wires as they run all the way across sensitive areas , for final build.
I used a 50k stereo MFR step pot , that solved all problems of hum and noise... Also I didn't install the ground lifter 10ohm resistor.
Reg
Prasi.
Hallo Jason, MM- Patrick, Prasi. and other Enthusiasts.
Thanks Patrick sold me generously his last boards i could now also finish one of
Jasons Amps last days.
First short Test was done late night with CT225 (Cheap Trick Speaker form
German DIY Magazin) with 100k pot and ended with an "aha"- impression.
The PSU is self wired Mr. Evil/PMI Cap Multiplier- nice regulated PSU!, gives it any news whereabouts PMI today?
After bad wiring transformer wire between speaker wire, gives slight hum- so
bad test Szenario!- i started my second test yesterday.
In use is:
http://fostexinternational.com/docs/speaker_components/pdf/FE126En.pdf
These Partnership blows also up my mind, like Jason wrote earlier to his TO-3
version.
The FE126is a real Diva, it needs a R-C-L correction 4,7R+4,7µ(DME,MKP+PIO)+0,82mH air gap, all parallel on + wire and bit dumping in
horn cabinet filled behind speaker.
lock here:http://www.youtube.com/watch?v=OKuzYr1WqL8- nice work with
music.
The VSSA plays really remiss the Fostex, very impressing, long time search could end here- but so many other delicate stuff to do.
If i look to still4given works out so many and:
HTML:What I have found is that as time passes I become less critical of how the amp sounds and more appreciative of the wonderful musical content. An amp like the VSSA is a huge help in that endeavor.
that is a real applicable given comment.
For prasi, also Jason: i am also on same search, right positioned pot.
Actually the Amp is used with simple 50k mono pot- and i feel it is in right
dimension.
The Input Cap(DME- PP+ Pio 40U-9) i have seen in still4given- terry's pictures and also N. Pass used them, so i teste it out- nothing wrong- very nice tonality.
This combination goes in my range.
I'm on the way now to etch my own shaan PiCiBi Board- John Bali version, to
build the simple without ccs, to find out the different.
Jason was amazed about TO-3 with genuine SK135/SJ50- that in mind-
all time on search.
Now some testcase, only pics.
I would also count in if Jason finished next time new boards.
The Amp is to good to only have ONE!
Best Regards, enjoy listening Music.
Bangla 50+.
P.S. yesterday i found from xrk971:"I was having temporary senior moments.", that sounds to good not to share.
Congratulations on the build. Looks great. I need to make some PSU bases like yours with trafo and PSU caps etc and space for different amps to go in and out. Maybe a 35v board, a 40v board and a 50v board should suffice for most amp projects around here. They would all have identical FASTON connectors X 2 sets and speaker binding posts. I don't need an enclosure but just a base to hold it all together.
Ha ha - my senior moments happen more often that you think. 🙂
forgot to give reference of the pot. here is a link to the pot i used in my build and is working flawlessly since 6 months.
21 Step High Precision Step Potentiometer A50KX2
run all the way across sensitive areas
Hallo prasi & xrk971.
Yes, i know, bad wiring, it peeves me actually by listening- one channel few hum. Will be change later in real case.
The Heat sink is a Fischer SK53-75mm high and has 0,85K/W. In my upset
150ma (over 10R/10W measured- 1,5V) and ~ 30-35°C- not much.
On ACA Pass Amp i use these one 100mm high- 0,65K/W to manage 1,26A
and it works daylong safe with single 19V supply rail.
And!!! 😱 it works, hope safe, without 22p compensation with older genuine 1380/3502 bought from AmpsLab- Michael Chua in hfe 150-160 region.
Could this be a reason for lower tend to oscillating? 😕
What i registered by listening more and more with the Fostex is the human
voice and over all clearance.
The naturalness sound, also 3D Imaging is very fine.
The 50k- stepped attenuator with SMD resistors is in watch list, but i am not
sure to use it because i have balance problems on source-TV- sh....!
X i have seen your thread about your active Fast Speaker- very impressing!B 80 - 8 Ohm
That one is also a very linear Fullrange, but i see not cheap in US.
A very good idea to create a universal use PSU- noticed, because senior moments.
Junm, nice work, you are right to set up the amp equal in nice recycled case.
The 175/56 are difficult to get, lucky who have some.
If i need LatFet i source from Profusion Exicon.
Hallo prasi & xrk971.
Yes, i know, bad wiring, it peeves me actually by listening- one channel few hum. Will be change later in real case.
The Heat sink is a Fischer SK53-75mm high and has 0,85K/W. In my upset
150ma (over 10R/10W measured- 1,5V) and ~ 30-35°C- not much.
On ACA Pass Amp i use these one 100mm high- 0,65K/W to manage 1,26A
and it works daylong safe with single 19V supply rail.
And!!! 😱 it works, hope safe, without 22p compensation with older genuine 1380/3502 bought from AmpsLab- Michael Chua in hfe 150-160 region.
Could this be a reason for lower tend to oscillating? 😕
What i registered by listening more and more with the Fostex is the human
voice and over all clearance.
The naturalness sound, also 3D Imaging is very fine.
The 50k- stepped attenuator with SMD resistors is in watch list, but i am not
sure to use it because i have balance problems on source-TV- sh....!
X i have seen your thread about your active Fast Speaker- very impressing!B 80 - 8 Ohm
That one is also a very linear Fullrange, but i see not cheap in US.
A very good idea to create a universal use PSU- noticed, because senior moments.
Junm, nice work, you are right to set up the amp equal in nice recycled case.
The 175/56 are difficult to get, lucky who have some.
If i need LatFet i source from Profusion Exicon.
BanglaH,
I found these lateral FETs to be the real thing. They work very well and are $5.40/pair.
Online Shop Original K1058 J162 2SK1058 2SJ162 one pair 22|Aliexpress Mobile
I found these lateral FETs to be the real thing. They work very well and are $5.40/pair.
Online Shop Original K1058 J162 2SK1058 2SJ162 one pair 22|Aliexpress Mobile
2SJ162 2SK1058 from Aliexpress- shop
Hallo X.
Thank you for information here.
I hope you have testet your LatMos with success.
In Trust and believe i also have ordered 4 Pairs, because the nearly unbeatable
price
. 🙄.
In other Thread you are i discussion about good SMPS, i agree that nice idea,
because it can lower project prices by not needing Toroids and Filter PSU Cap-
Bank.
But i've also registered that it is a challenge to find a real good one what works in Audio use.
Regards Bangla. 50+
Hallo X.
Thank you for information here.
I hope you have testet your LatMos with success.
In Trust and believe i also have ordered 4 Pairs, because the nearly unbeatable
price
. 🙄.In other Thread you are i discussion about good SMPS, i agree that nice idea,
because it can lower project prices by not needing Toroids and Filter PSU Cap-
Bank.
But i've also registered that it is a challenge to find a real good one what works in Audio use.
Regards Bangla. 50+
I have been doing much thinking about SMPS and have come to the conclusion that in order to get the supply clean for mids and HF, much more filtering is needed and not sure if savings in cost will be obtainable with SMPS. Weight savings definitely but performance may be best with toroid caps and CLC filtering.
I hope you find the source of hum. I had similar issue the other day and it was just how the power supply lines were connected - too close to input leads. Moving things around made it go away.
I hope you find the source of hum. I had similar issue the other day and it was just how the power supply lines were connected - too close to input leads. Moving things around made it go away.
I bought a pair of 90W smps to replace the 160VA toroid + 40mF PSU in a stereo chipamp.
When they arrived there was no way I could get them into the chassis. They were much bigger than the toroid+capacitors. And they cost more, even though they were a special low cost offer.
When they arrived there was no way I could get them into the chassis. They were much bigger than the toroid+capacitors. And they cost more, even though they were a special low cost offer.
I hope you find the source of hum.
😱 Hallo x.
Not real.
I have placed the PSU 180° moved direction, and put out the transformer wire
from sensitiv position, but still a little hum listenable.
I will change to normal Filter and see what happens.
In Cap Multiplier are pot to regulate balance between + and - rail? also to
reduce Hum possible?
xrk i have registered your Abletec SMPS.
Have you tested it on VHex- amplifier?
Regards Bangla H. 50+ 🙄
😱 Hallo x.
Not real.
I have placed the PSU 180° moved direction, and put out the transformer wire
from sensitiv position, but still a little hum listenable.
I will change to normal Filter and see what happens.
In Cap Multiplier are pot to regulate balance between + and - rail? also to
reduce Hum possible?
xrk i have registered your Abletec SMPS.
Have you tested it on VHex- amplifier?
Regards Bangla H. 50+ 🙄
😱 Hallo x.
Not real.
I have placed the PSU 180° moved direction, and put out the transformer wire
from sensitiv position, but still a little hum listenable.
I will change to normal Filter and see what happens.
In Cap Multiplier are pot to regulate balance between + and - rail? also to
reduce Hum possible?
xrk i have registered your Abletec SMPS.
Have you tested it on VHex- amplifier?
Regards Bangla H. 50+ 🙄
Hi,
you can try following that yielded success in my case.
1. Though not clear from pics, you appear to have installed 10ohm ground lift resistor near the anti parallel diodes. Replace that resistor with a jumper wire and test.
2. connect all speaker return cables to the PSU ground.
reg
Prasi
Mains transformer:
three pairs of wires in right pic of post800 show none as twisted. That will increase interference.
Do you have a star ground?
Have you taken some of your signal wiring to that star ground?
How far away from the PSU is your star ground?
three pairs of wires in right pic of post800 show none as twisted. That will increase interference.
Do you have a star ground?
Have you taken some of your signal wiring to that star ground?
How far away from the PSU is your star ground?
10ohm ground lift
Hallo Prasi & Andrew.
Thank you for helping advice.
About Ground lift 10ohm Resistor, i remember now i have read that originate
sometimes problems, but not in mind....old man.
[QUOTEnone as twisted][/QUOTE]
Yes thank you, Andrew, good advice to my bad wiring.... next to find out.
The PSU is original copy from Multiplier Ground loop- in the middle of Capbank is Star ground with hard 1,2mm Copper wire.
The Speaker are connected by shortest possible Way back to PSU Centerline.
I will work to the points and let you know the result..... sledge Hammer!!
Regards Bangla
Hallo Prasi & Andrew.
Thank you for helping advice.
About Ground lift 10ohm Resistor, i remember now i have read that originate
sometimes problems, but not in mind....old man.
[QUOTEnone as twisted][/QUOTE]
Yes thank you, Andrew, good advice to my bad wiring.... next to find out.
The PSU is original copy from Multiplier Ground loop- in the middle of Capbank is Star ground with hard 1,2mm Copper wire.
The Speaker are connected by shortest possible Way back to PSU Centerline.
I will work to the points and let you know the result..... sledge Hammer!!
Regards Bangla
:
xrk i have registered your Abletec SMPS.
Have you tested it on VHex- amplifier?
Regards Bangla H. 50+ 🙄
I have not had a chance to try the Abletec yet - busy putting together a new passive XO for a FAST speaker last night to test some full range drivers and a woofer with the VHex+. This amp really can drive a sealed speaker with some amazing bass extension. In the past when using a small class D amp, the RS225-8 in a 24liter sealed box started rolling off around 90Hz. It now goes to 40Hz F3 with this amp and no Linkwitz transform needed.
http://www.diyaudio.com/forums/full-range/292130-ff85wk-rs225-8-passive-fast.html
I should have some time tonight to give it a shot - it certainly would be very convenient if it worked well.
Last edited:
FF85K RS225
Hallo xrk.
I only have registered your activity in find eventualities smps use in A, AB- class Amps, but it means not every works fine and because that you lost some
money.
Your choice FF85K is pretty. With my first Test Fostex FE126En i also build a
little 3D Spiralhorn for FF85K and it seems they are perfect. It don't need any Filtercorrection.
The 3" speaker size is in diameter the best physically size to reproduce most
acoustic bandwidth spectrum in runtime to come to your ears.... so or likewise
i have read it from written engineer article.
I also build this little Horn with TB-W3-871- that gives a light bass buckling.
The second with Visaton FRS8M- not so bad, but sounds not so casually. 😀
The Japanese site is closed, nowhere to find.
You can listen FF85K Horn on your desk or near wall placed without subwoofer- it's real good.
Hallo xrk.
I only have registered your activity in find eventualities smps use in A, AB- class Amps, but it means not every works fine and because that you lost some
money.
Your choice FF85K is pretty. With my first Test Fostex FE126En i also build a
little 3D Spiralhorn for FF85K and it seems they are perfect. It don't need any Filtercorrection.
The 3" speaker size is in diameter the best physically size to reproduce most
acoustic bandwidth spectrum in runtime to come to your ears.... so or likewise
i have read it from written engineer article.
I also build this little Horn with TB-W3-871- that gives a light bass buckling.
The second with Visaton FRS8M- not so bad, but sounds not so casually. 😀
The Japanese site is closed, nowhere to find.
You can listen FF85K Horn on your desk or near wall placed without subwoofer- it's real good.
Hallo xrk.
I only have registered your activity in find eventualities smps use in A, AB- class Amps, but it means not every works fine and because that you lost some
money.
Your choice FF85K is pretty. With my first Test Fostex FE126En i also build a
little 3D Spiralhorn for FF85K and it seems they are perfect. It don't need any Filtercorrection.
The 3" speaker size is in diameter the best physically size to reproduce most
acoustic bandwidth spectrum in runtime to come to your ears.... so or likewise
i have read it from written engineer article.
I also build this little Horn with TB-W3-871- that gives a light bass buckling.
The second with Visaton FRS8M- not so bad, but sounds not so casually. 😀
The Japanese site is closed, nowhere to find.
You can listen FF85K Horn on your desk or near wall placed without subwoofer- it's real good.
The Abletec SMPS and a CRLC filter works very well for class AB.
http://www.diyaudio.com/forums/class-d/281698-abletec-53v-dual-rail-450w-supply-20-a-12.html
When you say spiral horn, do you mean like a Cornu? I have made many of those.
http://www.diyaudio.com/forums/full...k-building-cornu-spiral-horn-now-you-can.html
like a Cornu? I have made many of those.
Hallo X.
I was looking to your linked thread.
Now i registered that i be miles behind your experience/knowledge.
Interesting is the foam, what you also used in Trynergy Speaker.
Your activity is much more than simple diy stuff.
I will watch and learn, if i can. 😛 😀 😕 😱
And now i go sleep and dreaming crazy thinks about foam and construct
horns or so 😡 it's 1:30 morning.
reg Bangla.
Hallo X.
I was looking to your linked thread.
Now i registered that i be miles behind your experience/knowledge.
Interesting is the foam, what you also used in Trynergy Speaker.
Your activity is much more than simple diy stuff.
I will watch and learn, if i can. 😛 😀 😕 😱
And now i go sleep and dreaming crazy thinks about foam and construct
horns or so 😡 it's 1:30 morning.
reg Bangla.
Hi Bangla,Yes thank you, Andrew, good advice to my bad wiring.... next to find out.
The PSU is original copy from Multiplier Ground loop- in the middle of Capbank is Star ground with hard 1,2mm Copper wire.
The Speaker are connected by shortest possible Way back to PSU Centerline.
I will work to the points and let you know the result..... sledge Hammer!!
Regards Bangla
Star ground in the middle of Cap-Bank is not the best way.
Use this grounding scheme, by D. Self:
An externally hosted image should be here but it was not working when we last tested it.
Use this grounding scheme, by D. Self:
Hallo Guitar.mod.
Thank you for advice.
I have not really found cause of hum.
The Multiplier was redirected 180°, that the wire is bit more out of
sensitive Zone. I have add a little white wire to ground, that lowers the hum
to half.
I will test the Multiplier on other amp later, see what happens with hum there.
Now i have build in a save used PSU with 2x15000µF+ 2200µF BHC- slitfoil per rail.
The amp is silent. The right channel only a marginally hum, if you put your ear
nearly to cone.
With that i can live for moment, but needs rework to be fully contenting and i
have hopefully learnt than.
🙄
Rest showing test build pictures.
Hallo Guitar.mod.
Thank you for advice.
I have not really found cause of hum.
The Multiplier was redirected 180°, that the wire is bit more out of
sensitive Zone. I have add a little white wire to ground, that lowers the hum
to half.
I will test the Multiplier on other amp later, see what happens with hum there.
Now i have build in a save used PSU with 2x15000µF+ 2200µF BHC- slitfoil per rail.
The amp is silent. The right channel only a marginally hum, if you put your ear
nearly to cone.
With that i can live for moment, but needs rework to be fully contenting and i
have hopefully learnt than.
🙄Rest showing test build pictures.
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