This circuit was obtained from an 80's Electronic Engineering. The circuit detects ice formation by triggering a warning light. The operational amplifier is of the time.
This test consists of a simple Hartley oscillator using a transformer of the type found on older...
n be assembled with BC558 transistors for low power transistors and a BD136 for the output. The...
This oscillator takes advantage of the 2000 ohms headphone inductance as the oscillator circuit coil....