Hi guys, once again I'm going to do this in english to make it a bit easier (given all sources I found on this topic are in english). I have recently built a shin ei univibe replica from the late 1960's. There is a lot in the circuit, but right now I am having some issues with the LFO, Ibelieve at least.
The situation is as follows: I got it to work perfectly, when I installed it into the chassis I shorted some things on accident and fried some transistors. I have now replaced all the transistors and the circuit works almost perfectly, I am getting the right sound form both the vibrato and chorus section,
BUT
The bulb doesn't oscillate slow enough. right now it only does a very fast flicker and when I turn down the speed it stops flickering and just sit on at full brightness. What could this be?
I shared the pcb layout I am using and a more detailed schematic similar to the the LFO/ lamp driver of the pcb (the princible is the same in both).
Here are some things it almost definitly is not:
I am using a stacked potentiometer (100k) for the speed, as specified, so this shouldn't be an issue, and all the wires connecting to the pots end in and outputs are also perfect. So I am thinking it might be a capacitor? But I dont know which one could be responsible for this.
Any input will really be appreciated as I am very lost at the moment.