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.
We found this circuit in a 1990 documentation. Its purpose is to maintain the charge of a battery, the...
This circuit has a very fast switching action from an input signal. It can be applied to almost any...
This infrared “radar” was found in a 2000 documentation. Its range varies between 20 cm and 1...