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 didactic circuit makes the sequential activation from 0 to 10 to demonstrate the functioning of a...
This power source was found in an old Argentine publication from 1973. The transistor could be the...
This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old...