NEW Audio amplifier kits, modules and many others.

[col]

I think if you make a balanced version of the TA3020 board then you have something that will really compete with the Hypex modules. This will be very interesting!

My DA-1 is still sitting in its cardboard box. I don't have an idea for a power supply. I'm hoping that the SMPS will be available shortly, waiting paiently for that

Iv'e been testing my TA2022 board today but I am having alot of problems with noise. Sounds like static from tuning a radio and I can't get rid of it. Iv'e tried balancing up the connections using NTE transformers but no difference.

col.

[Cristi]

col,
try to use diferent location for connectinng the signal gnd with power gnd. and also, try to make an stand off for the output inductors, so they will not be that close to the signal path. furthermore, can try to route signal directely to the pins of the IC so, in this way can eliminate the noise completely. i can give you instructions how to do that.
anyway the new version whicj i sell now is totaly remade and has better layout, and no signal or noise issues at all.

[MartinQ]

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

Here's what happened Col.

I saw the question about the DA-1 and had some vague memory of that module. I went to the website to find out more about it and only found a minimal amount of information (one picture, a brief description, and a PDF link). So, I came back here and asked my questions. If I cannot find the information at the source I will ask. I would not consider digging for the information unless it was necessary.

I will say that the website has improved quite a bit and I've noticed that many of the modules now have a great deal of information available and that is great to see.

[col]

furthermore, can try to route signal directely to the pins of the IC so, in this way can eliminate the noise completely. i can give you instructions how to do that.

Yes, please give instructions on how to do this, I think that will be the most effective solution.

cheers,
col.

[e_fortier]

Hi,

I would also be interested since I also bought a TA2022 from you, it was an older version without mounting holes and with no heatsink (but very good price), does it has the same problem.

Regarding the TDA8920BTH PCB, the amp is finished and sounds pretty good (way too much work to change these capacitors), I will bring it next Saturday to a DIY gathering in Montreal so I will get some feedback from many musicians, I will report back since they have way better ears than I do

Thanks,
Eric

[ttan98]

CNX,

any chance of answering post 104/

[xaudiox]

i did tried my ta3020 amp with +-35Vdc before while waiting for my toroidal to arrive.

It did work fine and didnt noticed any problems running with the said supply..

[Cristi]

Originally posted by ttan98
CNX,

any chance of answering post 104/

sorry, i missed your question.

theoretically the amplifier can work from +-28V to +- 65. but to make-it work with less than 35V need to replace few resistors from under/over voltage detection circuit. right now is set at 36-64V range. of course it has about 10% tolerance and can be working even with less than 36, as xaudiox mention before. but without changing this resistors values, it is very possible to enter in undervoltage lockout when playing loud and voltage drops.

if you will modify the range to start at 28V, it will also change the upper limit from 64 to about 56V so cannot use at higher voltages until replacing the resistors with the previous ones.

[MartinQ]

Originally posted by cnx
theoretically the amplifier can work from +-28V to +- 65. but to make-it work with less than 35V need to replace few resistors from under/over voltage detection circuit. right now is set at 36-64V range. of course it has about 10% tolerance and can be working even with less than 36, as xaudiox mention before. but without changing this resistors values, it is very possible to enter in undervoltage lockout when playing loud and voltage drops.

if you will modify the range to start at 28V, it will also change the upper limit from 64 to about 56V so cannot use at higher voltages until replacing the resistors with the previous ones.

Based on this information, would it be possible to raise the operating voltage beyond 64V using a similar change in resistor values?

I have a non-functional amplifier with a +-80V supply that I would like to make use of.

[chris7916]

Originally posted by MartinQ
Based on this information, would it be possible to raise the operating voltage beyond 64V using a similar change in resistor values?
I have a non-functional amplifier with a +-80V supply that I would like to make use of.

If you have a look at datasheet, you will quickly notice that answer is a big NO.
If I remember well, absolute max is 70V or even a bit less.

Christian