12-06-2024, 12:16 AM
[attachment=4242 Wrote:hifinet pid='59029' dateline='1731363529'][attachment=4241][attachment=4240][attachment=4239]
(11-09-2024, 01:29 PM)eculcea Wrote: It looks the more TDA1387 the better. I think physically I could solder another 8 chips adapter on top of each other to make it 16 chips, from electronics standpoint would this work?
I am a hobbyist learning about audio electronics and maybe this is a dumb question.
Yes, it works. I removed all of the pins from two modules, and then soldered 7 wires (pins 1, 2, 3, 5, 6, 25, 28) connecting the two boards to the PCB. The IV resistor needs to be reduced in half to about 210R (or less than 215R), since the current will be doubled. This will reduce noise by another 3dB, and also reduce the output impedence. I think the power supply decoupling capacitors will need to be doubled.
I did not hear much of a difference in sound quality, but there were some limitations in that I used standard metal film IV resistors, and I didn't double the decoupling capacitors.
I got this working. I used tantalum SMD resistors in serial to make it 200R. I changed the capacitors to 2200uF. Listening between the 2 I think the 16 chips TDA1387 has a better and more detailed sound at the lower frequencies. It could be just a placebo effect since this is all subjective
