I am wandering here from the Chip Amp pages having just completed an Lm3886 project. I am now keen to explore the world of Class D. So far my only experience is Fiio A1 desktop speaker amp. Pulled it out of the case and it seems to be based on TFA9815T with an OPA2134 op amp front end (nice touch!). This little critter sounds pretty good but I am keen to build a Class D amp for myself. I dont want to populate the boards so really am looking for advice on what sort of completed boards to source with a view to putting it all together. Maybe with a linear power supply (as I feel comfortable making one of those)?. Thanks
How about a Tripath board from Sure Electronics?
https://store.sure-electronics.com/product/AA-AB32155
https://www.ebay.com/itm/110932147227
It's ample power for desktop use or a small room.
Now, Tripath went bankrupt in 2007, but overproduced amp chips before that to inflate sales figures, so it's unclear how many genuine chips are still out there. I suspect Sure uses real chips, but when it comes to the current crop of cheap ebay boards with red capacitors, those could have fakes.
Other boards I've dabbled with are based on Yamaha chips, like YDA138 and YDA148, which have power comparable to the TA2024. YDA148 things are rare (unfortunate since they're rated for a higher supply voltage, like a 4S lithium battery), but there's a variety of YDA138 boards. Some with no output inductors, with inductors, with bluetooth, two chips strapped to mono (for 4 ohm loads), 2.1 (8 ohm L & R, 4 ohm sub). Most come complete with volume controls, so getting them up and running is easy.
As for power supplies, I've seen Wii 12V power bricks as cheap as $1 at local thrift stores, so that's what my TA2024 amp uses.
https://store.sure-electronics.com/product/AA-AB32155
https://www.ebay.com/itm/110932147227
It's ample power for desktop use or a small room.
Now, Tripath went bankrupt in 2007, but overproduced amp chips before that to inflate sales figures, so it's unclear how many genuine chips are still out there. I suspect Sure uses real chips, but when it comes to the current crop of cheap ebay boards with red capacitors, those could have fakes.
Other boards I've dabbled with are based on Yamaha chips, like YDA138 and YDA148, which have power comparable to the TA2024. YDA148 things are rare (unfortunate since they're rated for a higher supply voltage, like a 4S lithium battery), but there's a variety of YDA138 boards. Some with no output inductors, with inductors, with bluetooth, two chips strapped to mono (for 4 ohm loads), 2.1 (8 ohm L & R, 4 ohm sub). Most come complete with volume controls, so getting them up and running is easy.
As for power supplies, I've seen Wii 12V power bricks as cheap as $1 at local thrift stores, so that's what my TA2024 amp uses.
How about the Zoudio amp; www.zoudio.com? Maybe takes some time to get but well worth the wait, IMHO. You'd spend hundreds more to get equivalent functionality, which includes 4 output channels, BT, I2S, USB and even Analog connectivity and most significantly, DSP on each channel for crossover filters. Example, you can drive two, two-way speakers with it directly connected to the speaker terminals, crossover points and slopes programmed in software. How cool is that?
I think the latest in technology is digitally connected amplifiers with multi-outputs and built-in DSP crossover filtering. There are other offerings, like the Wondom JAB2-250 2x50W Class D Audio Amp Board Bluetooth 5.0 Amplifier Board With DSP / 4 x 30 Watt Watt Class D Audio Amplifier Board w ADAU1701 DSP & Bluetooth Ver5.0 JAB4-30.
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