The operational amplifier and the sensor used in this National Semiconductor circuit are not common today, but the configuration can be adapted to use current components.
On this 1960s circuit, stations are pre-tuned in trimmers and then selected by a switch. The...
This small shaver bender circuit makes it possible to use 220/240 V shavers on 110 V networks. The...
The operational amplifier used in this application is not the most common today. The circuit is...