ProtoDAC TDA1387 X8 project

[hifinet]

I do not know if repeated clipping (due to too high a resistance I/V resistor) will lead to premature chip failure.

I have no explanation how a single channel in all eight chips could fail at once, as experienced by DRONE7. Of the modules that I reject for the kit (about 7%), most have a channel failure in one chip (manifest by low output in one channel). A much smaller number have low output in both channels.

The TDA1387 has a maximum supply voltage rating of 5.5V (and absolute max rating of 6.0V), which is close to the typical voltage. This is similar to the TDA1545, which are both CMOS. This compares to the TDA1543 with max rating of 8.0V (absolute max of 9V).

I obtain modules only from HuaXinHuiDianZi Store on Ali (w0174.jgvknymwp on eBay is the same seller, I think). He was the only seller of modules on Ali when I first obtained them (except for one other seller WhatSell DKK Store who sold in lots of 10; bought once from him, he shorted me and had high failures, never bought again from him).