Found in an EEE this circuit uses FETs of the time and a bipolar one. Current equivalent transistors can be used.
This circuit came out in a publication called Electronics Handbook of 1993. Q1 can be a 2N2222 or even...
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...
This circuit was found in General Electric documentation from 1965. The transistors are from that...