We found this circuit in a 1960 Radioarama magazine. The instrument tests common general-purpose transistors indicating their gain on a moving coil instrument. The loop serves to adjust the circuit.
On this 1960s circuit, stations are pre-tuned in trimmers and then selected by a switch. The...
This small shaver bender circuit makes it possible to use 220/240 V shavers on 110 V networks. The...
The operational amplifier used in this application is not the most common today. The circuit is...