This circuit is based on the light comparison of two LDR sensors. We found it in a 90s Popular Electronics. The transistor must be according to the indicator or load being driven.
We found this circuit in a 2005 documentation. The circuit allows the automation of a gate through...
Found in an 90s Electronic Design, this circuit provides a 110 dB output to a ceramic transducer....
This circuit activates a relay with a frequency signal determined by the adjustment components. The...