Found in a 1968 Texas Instruments documentation this circuit uses an SCR from that time. Modern equivalent types can be used for a higher power version.
This circuit controls a heating element with voltage from 6 to 30 V and current up to 3 A from...
Found in a 1967 General Electric SCR manual, this circuit can be used to protect a load by...
This filter was found in Radio Electronics, and its configuration can be applied to any...