This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
This circuit generates trains of pulses in regular intervals determined by R1 and C1. The...
This circuit was found in a 1977 Radio Shack documentation. The unijunction transistor can be...
In the figure we show how to use a varicap to modulate a signal in frequency. The circuit can be...