This circuit with its light source was found in American documentation two years 70. Or transformer of the type found in small transistor radios of the time. The transistors are general-purpose.
The operational Amplifier used in this circuit is uncommon today. However, the same circuit can be...
This small blocking oscillator for approximately 1000 Hz was found in an American documentation from the...
We found this circuit in a Radio & Electronics Constructor from November 1975. The magazine no longer...