This circuit was found in Motorola documentation from 1968. The transistors are from the company, and the power supply is rated at 22 V.
This oscillator does not carry any resonant circuit, except for the one formed by the crystal...
This is the circuit of a small commercial amplifier from the 1970s from Philips Argentina. The...
This powerful high-fidelity amplifier was described in an article in Radio Electronics magazine in...