This circuit is from an 80's documentation, firing when the input voltage exceeds 5 V. The SCR can be the TIC106 need not have a heatsink.
We found this circuit in a 1987 Hands On Electronics. It was indicated at the time to power...
This amplifier, suggested by National Semiconductor (Now Texas Instruments), has high input...
This circuit causes one LED to light up if the voltage falls below the value set in R3 and the...