We found these circuits in a Popular Electronics from the 90s. The circuit has a simple low power version and a higher power version with MOSFET (VMOS) of the time.
Microchip's EQCO62X20 6.25Gbps Asymmetric Coax Equalizer is a driver/equalizer chipset that forms...
When the sensor, an ordinary photo-transistor, receives light, the relay closes its contacts. The...
This input stage has unit gain but a high input impedance and low output impedance. The circuit is...