My first DIY modules - starting a Kosmo format build

[eric]

Have you tried this :

1222 Tuner VCO Module

I finally got around to powering up my #1222 VCOs, I was waiting for the mica caps to arrive from AliExpress but they’re still at least a couple weeks away, so I gave up. While poking around trying to figure out why I can’t seem to be able to calibrate the frequencies (more on that later), I noticed a resistor getting quite hot. It is R42, the resistors in series with the 4.1 voltage reference. [image] I did a bit of math : The current through R42 is I=V/R= (12-4.1)/220 = 35.9mA which seem…

This just makes a lot of sense and I will build mine with a R42 of 1K from the start.