We found this circuit in a 1966 US documentation. It simulates a variable capacitor that can vary capacitance from 1,000 to 1. Transistors are general purpose types.
This multivibrator that drives an LED has ultra-low consumption, working with voltages from 1.5 V....
November 2016 - Lumileds' new high power Luxeon 5050 LEDs can now be purchased from Mouser...
This circuit was found in a Hands On Electronics from the 90s. The circuit does not need a...