This circuit with unijunction transistors was found in a documentation from the 80's. The trigger times of the SCRs depend on the capacitors and are adjusted in the 5M (4M7) potentiometers.
Using junction FETs, a configurable configuration is achieved for very low frequencies. FETs can...
This is a conventional circuit with triac but no diac which would be nice in place of R2. In the...
This simple teaching circuit uses 5 transistors in a monophonic organ version whose notes are...