This circuit was obtained in a documentation about old neon lamps. The circuit indicates when a home appliance with thermostat and heating element is on.
This circuit is from 1950, from the time when some still called the crystal triode transistor. The circuit is...
This oscillator found in the April 1984 issue of Radio Electronics magazine is designed for bird...
The operational amplifier used in this circuit is uncommon today, but the configuration can be...