This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
The frequency of this oscillator depends on the crystal used and the transistors. The circuit was...
This circuit is for collectors. It is the circuit of one of the most popular transistor radios of the...
Another of the many tachometer circuits we have on our site. This one is from the September 1976...