This low frequency oscillator circuit was found in an Electronic Design from the 90s. The transistors are common types, and the frequency is given by the crystal.
This amplifier for small cassette tape players was found in an English documentation from 1969. The...
This circuit is intended to trigger a TTL door or flip-flip from a signal coming from an SCR....
We find this circuit in a 1980s documentation. The circuit can be applied to modern operators with...