This crystal oscillator is indicated for the calibration of IF steps of common radio receivers. The transistor admits equivalent as 2N2222 or BF494. The circuit is from an old American publication.
This circuit is from a Japanese magazine of 1973. The circuit is designed to withdraw the power...
This is an interesting sound effects circuit that uses only discrete components. Components are common...
This circuit causes a green LED to light up when we step on the brakes and the rear lamps to light...