Pedal: fixing a Temu digital delay

A Temu guitar pedal… Well 5 euro (or usd) is not a lot for a pedal that is for sure, so I tried this out, yet arrived broken. So got a refund but lets try and fix it anyway I thought.

Interesting design, it’s made on two pcb’s the thinnest and flomsiest pcbs I ever saw, and they come with a fix from factory due to a built in error. The red wire, jumping power to the right spot

The error turned out to be several misstages in a voltage devider so the opamp could not function. But could retrieve the neccesary voltage from another chip the pt2399 surface mount equivalent.

Not bad though, theese pedals, cost next to nothing, in essence same price as the footswitch alone (if it wasn’t a cheap copy). And for that you get a robust metal enclosure, true bypass switching and a decent circuit, if it wasn’t broken that is. I suppose the thin pcb might flex and cause a trace or two to brake down the line but as is, not too much to complain about. There is also a blog post I noted about nodding theese, so some inexpensive fun experimentation can be had, although you need a steady hand, and the right tools to work on the scale of theese tiny parts.