RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic and the frequency is determined by the crystal.
We found this circuit in an American 1980s documentation. The operational ones used are not common...
This low frequency square wave oscillator using the 741 Operational Amplifier produces sound when...
May 2017 - New sequencers UDC9090A for monitoring up to 10 power supplies from Texas Instruments...