Impressive. It leaves me with a few questions:
You have two nice output filter chokes and one rather small power supply decoupling capacitor. Are the filter capacitors ceramic SMD or foil? It must be a mono amplifier operating in BTL configuration. I would expect 6-7 board connection terminals (in - eventually balanced, out and supply) but I see 9?
Clearly you have most components on the rear side which we do not see. Would it be possible to give us a look at that side as well? You use a 700KHz carrier frequency which is in the high end. 700KHz carrier and 75W will normally necessitate a small heatsink. Do you use a heatsink?
75W is in which impedance?
You have two nice output filter chokes and one rather small power supply decoupling capacitor. Are the filter capacitors ceramic SMD or foil? It must be a mono amplifier operating in BTL configuration. I would expect 6-7 board connection terminals (in - eventually balanced, out and supply) but I see 9?
Clearly you have most components on the rear side which we do not see. Would it be possible to give us a look at that side as well? You use a 700KHz carrier frequency which is in the high end. 700KHz carrier and 75W will normally necessitate a small heatsink. Do you use a heatsink?
75W is in which impedance?
At which point this is DIY without any more informations, photos or schematics?
The 4x4.5-inch active column uses two 75W class D amplifiers.
The 4x4 "active column uses a 75W class D amplifier.
The power supply can work at ac85v-ac265v 50Hz 60Hz
I have worked steadily for more than 2 years since DIY.
No fans, no radiators.
Attachments
If the point of this is only to brag, or sell these things, there's a more appropriate sub-forum for that:
https://www.diyaudio.com/forums/swap-meet/
https://www.diyaudio.com/forums/swap-meet/
Is there any more pictures in front of you? That's why I sent these pictures.
Very sorry!
I use TDK for chip capacitor, Siemens for power amplifier output and Philips for inductance. I wonder if these are very poor components.
I have applied for a patent for this power amplifier in China. The switching frequency is 700kHz, 75W without fan or radiator, and the medium and high frequency can be compared with ab. Is this a hifi amplifier?
I have been engaged in research and development of class D power amplifier for more than 10 years.
As long as you refuse to share any knowledge there will be little interest in your contributions.
Pictures and DIY product application pictures have been uploaded.
Although it looks very small, the power is only 75W, but it took me more than two years to have this small product. So...
I only sent it when someone asked about the product pictures.
Send DIY's finished product pictures
Thank you!
You do patent in China?
You want to sell amplifier.
You want to make money.
You do not do a DIYS project, anyone can do.
You want profit.
This is not the space to sell your amplifier, maybe you do not want to understand.
There is a space in this forum you can show your "amplifier for sale". But not here.
You ignore this, people get upset. When you signed into this forum you read rules. Maybe in China no rules for you. This forum not China. Be so polite to follow forum rules.
PS Every crappy China electronics part has fake Siemens, Nichicon, BB, TI, Philips, TDK and other "most expensive name" parts. Very happy to hear you use them too.
You want to sell amplifier.
You want to make money.
You do not do a DIYS project, anyone can do.
You want profit.
This is not the space to sell your amplifier, maybe you do not want to understand.
There is a space in this forum you can show your "amplifier for sale". But not here.
You ignore this, people get upset. When you signed into this forum you read rules. Maybe in China no rules for you. This forum not China. Be so polite to follow forum rules.
PS Every crappy China electronics part has fake Siemens, Nichicon, BB, TI, Philips, TDK and other "most expensive name" parts. Very happy to hear you use them too.
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