Using an LDR as a sensor and an operational amplifier this circuit was found in the Encyclopedia of Electronic Circuits volume 5 from 1995. The circuit triggers an optodiac.
This configuration with the LM111 was found in your factory manual. The circuit can be implemented with...
The double T of this circuit makes it amplify only the 1 kHz signals. The circuit can be used as a...
This car alarm was obtained in a Signetics documentation from the 1980s. The circuit uses the 555...