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Old 21st June 2019, 05:33 AM   #1411
Nenola is offline Nenola  Finland
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Finally got my class D 2.1 amp assembled. Inside two TPA3118 boards with gain mod for main channels, one TPA3116 mono amp for subwoofer and a Wondom DSP. Power supply is 24V 5A.

I got frustrated with the poor quality of pre-assembled 2.1 boards and decided to go this way. Of course the costs are bigger, but I'm very happy with the result. No hiss and only a little bit audible whine when not playing music. Might be the supply, need to do some research if I could lower the noise.
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Old 21st June 2019, 10:54 PM   #1412
enio nery is offline enio nery  Philippines
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i got the same board for my very 1st class d amp. the psu is a little overkill
still waiting for the tube buffer,relay and the bluetooth receiver so i can start working on it.

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Old 28th June 2019, 08:57 AM   #1413
chermann is offline chermann  Austria
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Quote:
Originally Posted by Nenola View Post
Finally got my class D 2.1 amp assembled. Inside two TPA3118 boards with gain mod for main channels, one TPA3116 mono amp for subwoofer and a Wondom DSP. Power supply is 24V 5A.

I got frustrated with the poor quality of pre-assembled 2.1 boards and decided to go this way. Of course the costs are bigger, but I'm very happy with the result. No hiss and only a little bit audible whine when not playing music. Might be the supply, need to do some research if I could lower the noise.


+1

@ noise...try the cables separate and short as possible
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Old 29th June 2019, 02:41 AM   #1414
Turbowatch2 is offline Turbowatch2  Germany
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You know you have to use rectivier and capacitors and this will give about DC=AC x 1.45?

18 volt AC will be quite much for this chip.
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Old 29th June 2019, 04:41 PM   #1415
DUG is offline DUG  Canada
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Quote:
Originally Posted by Turbowatch2 View Post
You know you have to use rectivier and capacitors and this will give about DC=AC x 1.45?

18 volt AC will be quite much for this chip.
DC=18 x 1.414 -1.2 = 24.25

no problems even at 10% high line voltage.
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Old 29th June 2019, 04:47 PM   #1416
DUG is offline DUG  Canada
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So I start with a TPA3251/3255 pcb, a front end for it and heatsink sliced from a computer heatsink.
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Old 29th June 2019, 05:08 PM   #1417
DUG is offline DUG  Canada
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Put on some parts and mount to the bottom plate of a Hammond extruded box.
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Old 29th June 2019, 05:14 PM   #1418
DUG is offline DUG  Canada
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And put the whole thing together.
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Old 4th July 2019, 09:06 AM   #1419
Nenola is offline Nenola  Finland
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Quote:
Originally Posted by chermann View Post
+1

@ noise...try the cables separate and short as possible
That would probably be worth a shot. The wiring as it is, is probably the worst possible with power and signal wires mixed and crossed

Output relay with a delay would also be good, I'm having quite a thump when powering on and off. I could use the mute on TPA3118s but I think it's not accessible in the TPA3116 board. But no room for that kind of additions
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Old 4th July 2019, 11:06 AM   #1420
chermann is offline chermann  Austria
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Quote:
Originally Posted by Nenola View Post
That would probably be worth a shot. The wiring as it is, is probably the worst possible with power and signal wires mixed and crossed

Output relay with a delay would also be good, I'm having quite a thump when powering on and off. I could use the mute on TPA3118s but I think it's not accessible in the TPA3116 board. But no room for that kind of additions
Hi

i use a small "coax" cable for the imputs
yes at this compact size its a problem to fit everything

chris
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