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 80's circuit has an input resistance of the order of 880 M and gain 10, using operational...
This circuit is powered by 1.5 V and has a long lifespan as it consumes only 320 uA. The circuit is...
This circuit provides a negative supply for circuit biasing. The current is very low. The voltage...