We found this circuit in a 1985 technical publication. The circuit uses PUTs to drive lamps. Relays or LEDs can be used with the voltage according to the supply.
The figure shows how to control the blinking of a 5 V blinking LED with an LDR. The LED only...
Suggested by Maxim in documentation from the 90s, this circuit has its response curve given next to...
This circuit is from a 1965 General Electric publication. It uses a thermistor to fire a reed...