This circuit is from a 1967 US publication. The configuration can serve as a basis for designs with modern components.
Found on Popular Electronics from the 1990s, this oscillator uses a general purpose transistor. The...
Found in Radio Electronics from the 90s, this circuit uses components from that time. However, it...
This is a simple 1-digit voltmeter circuit using voltage comparators. It was found in a 2004...