This circuit has its application suggested in an alarm system. The circuit is from an old RCA manual. R1 has 5.6 ohm, R2 22k, R3 2k2. The capacitor is 8 uF.
This rain, flood or leak sensor was found in a 90s Popular Electronics. All the components used are...
This circuit was found in documentation from the 1980s. It is powered by the audio signal that must...
This circuit can indicate when a high voltage exceeds a certain value, with the transition of its...