Found in an American publication from 1968, this circuit generates pulses at a rate of 2,500 per second. The transistor can be replaced by a modern equivalent.
This is a typical RF oscillator configuration found in a 1980s documentation. The frequency...
We found this circuit in factory documentation from the 70s. The operational amplifier is from...
Found in 90's Electronic Engineering this circuit can be used to measure phase angles between two...