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Old 5th March 2009, 06:52 AM   #101
Cristi is offline Cristi  Europe
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you can try to replace the capacitors from the LC network (C28 and C34), i made 2 versions of this boards, one with 1uF and one with 0.22uF. the advantage of the lower capacity is the higher cut-off freq. of the filter, which lead to more clear and natural sound. i assume that on your board they are 220nF, change them with 1uF capacitors, and also the capacitors from RC network (C29 and C35) with 1uF. this will decrease the amplitude of the residual noise to less than 1V but it may lower the filter cut-off frequency. you can increase the value of this capacitors up to 2.2uF, but not more, otherwise the sound quality will be altered.
i will send you the schematic by mail later.
if you don't have the capacitors, i can send you and whatever else u need for this. i didn't forgot about the input connector which i didn't sent last time, when i saw the message after i sent the parcel. i said that i will send to you at the next delivery.
i won't charge you anything for the parts, but i preffer to send them at a next order, since the shipping cost...
furthermore, as i sad before if you want to reduce even more, you can increase the order of the filter, by adding anothrer LC and RC network with same values on each channel.
let meknow the result after you change them.
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Old 6th March 2009, 04:01 PM   #102
Cristi is offline Cristi  Europe
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New version of TA3020 amplifier released

the new version includes the rectifier bridge, bigger capacitors, supply for the fan, improved layout and routing. this version will replace the actual one, which stock is almost finished.
the size of the board is the same, and arangement is similar, but some parts which are under the heatsink were added, and rerouted.
the price will be a little higher that the previous version, considering that has the supply included, but lower price than an TA3020 amplifier board and a separate supply.
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Old 6th March 2009, 10:12 PM   #103
col is offline col  Australia
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I guess many DIYers will prefer to have the power supply on the board. I for one though prefer not to have it on board and to create my own. Plenty of options for purchasing caps etc.. here, don't need to pay the postage cost from China. Also, later on when a SMPS option become available if you purchase PCB without the power supply gives you the option to change.

One thing I would appreciate though, is somekind of option on the board to use balanced inputs. All these Tripath amp modules and kits from all the different suppliers don't have this option. Is a hassle if you are using Pro-audio gear or all your other stuff has balanced connections.

People in Pro-audio industry won't use anything without balanced connectivity, your product is missing an entire market.

col.
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Old 7th March 2009, 01:06 AM   #104
ttan98 is offline ttan98  Australia
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CNX,

Hi,

I am thinking of buying the TA3020, also I have already a power transformer which gives me +/- 34Vdc, norminal. The min. dc voltage for this board is +/- 35Vdc. Is is easy to modify the board to accept 30Vdc min.?
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Old 7th March 2009, 02:35 AM   #105
Ceibal is offline Ceibal  United States
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Default DA-1

Has anyone compared these amps to Hypex? I am interested in the DA-1. What are the performance figures on this amp?
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Old 7th March 2009, 02:44 AM   #106
MartinQ is offline MartinQ  Canada
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What chip is the DA-1 amplifier based on? Is there any more information on this?
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Old 7th March 2009, 04:48 AM   #107
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Quote:
Originally posted by cnx
New version of TA3020 amplifier released

the new version includes the rectifier bridge, bigger capacitors, supply for the fan, improved layout and routing. this version will replace the actual one, which stock is almost finished.
the size of the board is the same, and arangement is similar, but some parts which are under the heatsink were added, and rerouted.
the price will be a little higher that the previous version, considering that has the supply included, but lower price than an TA3020 amplifier board and a separate supply.
Hi,

Good news (although current version is fine).

Power supply on board... hmm, for this kind of amplifier, I prefer not to have it on board. It permits to go for SMPS or have linear power supply adapted to your needs.

In case you are not yet 100% done with PCB, there is a couple of point I'de like to share:

- Fan connector: connector like what we have on computer motherboard (3 pins) is really more convenient as it authorizes to try different fans without having to cut cables.

- Am I the only one who would appreciate to have holes used to fix PCB on case to be isolated from amplifier ground ?

Anyway, nice amplifier. Thank you.
Cheers,

Christian
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Old 7th March 2009, 04:52 AM   #108
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Quote:
Originally posted by col
One thing I would appreciate though, is somekind of option on the board to use balanced inputs. All these Tripath amp modules and kits from all the different suppliers don't have this option. Is a hassle if you are using Pro-audio gear or all your other stuff has balanced connections.

People in Pro-audio industry won't use anything without balanced connectivity, your product is missing an entire market.
I had similar feeling some time ago but then realized that having both 5balanced + unbalanced) will make it more expensive and a bit more complex. Maybe you reach another market (although I'm not sure pro audio market is looking at this stuff) but you loose an existing one.

If balanced inputs is a must, why not going for Neutrik input transformer or additional board dealing with this stuff ?

Christian
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Old 7th March 2009, 06:06 AM   #109
col is offline col  Australia
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I have already been using NTE transformers or Balanced input PCB (plus power supply), see the projects on my website.

I think the Hypex approach is the best one. Just make the default connection balanced. If any one wants unbalanced they can just use psuedo-balanced leads.

Martin-Q, the question you ask about DA-1 has already been answered. Why don't you read this entire thread.

col.
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Old 7th March 2009, 06:24 AM   #110
Cristi is offline Cristi  Europe
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thanks everybody for advices. as i said before, i will take into account the users requests and oppinions, so, i will update the next version based on this.
this new version, v2 has the mounting oles insulated from the ground, but i kept the star ground at the mounting hole between the output coils, just in case somebody want to use that for connecting to the chassis.
from this board can also remove the rectifier bridge, and use external capacitors, if somebody consider that those from the board are not big enough or want to use an SMPS.
the fan connector which i use right now has two pins, due to limited space. and can use one from mainboards, which has also 2 pins.
balanced input option i will include also in the next version, and the advantage of having it is not only the use with pro-audio, but is also more simple bridging the board using +- and -+ connection.
any other sugestions are welcome.

DA-1 amp, is based on TPA2001 chip, class D filterless audio amplifier, followed by two power stages for each channel, since they are connected in BTL mode. this amp is more suited for subwoofer applications, since the freq. response favorize the frequencies below 10 KHZ, is not linear on all audio bandwidth, but has high efficiency and requires single power supply and one control supply only.
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