Found in a 1968 EEE, this switch controls a high-power load from an audio signal. The current is determined by the type of SCR.
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...
This circuit is from Linear Technology 2005 documentation. The circuit is based on company...
The integrated circuit used in this power supply is no longer very common in power supplies today....