Found in an old Popular Electronics, this circuit warns when a remote lighting system is not working. The circuit uses an LDR as a sensor and the components used are quite common today.
July 2017 - Texas Instruments' new bidirectional current controllers LM5170-Q1 for power...
This circuit provides voltages and a 1 kHz signal for measurement bridges. The circuit is from...
Suggested by National based on the LM6218, this circuit from the 90s has high speed...