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.
This receiver receives signals from the VHF band with earpiece or application in a power stage. The...
Originally created to power an 80's RTTY printer, this circuit can be used in other applications. The...
This circuit is from a Popular Electronics of the 90's. Any power MOSFET can be used. The circuit...