
First testing with the 555 timer IC: Casperelectronics LFO for the Speak & X family.
You can find all the needed info for building this one, on Casper’s site, here:

First testing with the 555 timer IC: Casperelectronics LFO for the Speak & X family.
You can find all the needed info for building this one, on Casper’s site, here: