This dual flasher for high brightness LEDs was found in an American documentation from the 90's. The circuit can be powered by lower voltages with the reduction of R1 and R4.
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...