This interesting transistor circuit has several effects and an included amplifier. The circuit is monophonic and powered by standard batteries. The number of keys can be changed.
This simple amplifier with transistors was obtained in a documentation of the 90's requiring a...
The presented circuit uses a symmetrical power source to supply an amplifier with the LM139 or...
This is half of a 4-channel amplifier from a system published in the October 1971 issue of Radio...