This circuit was found in RCA documentation from the 1960s. The circuit uses components from that time and can measure speeds up to 10,000 rpm.
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...