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 alarm with the 555 integrated circuit is from an EDN from the 90s. The circuit directly...
Found in a General Electric documentation from the 1980s, this circuit makes use of a FET...
This circuit was suggested by Siliconix in a 1980s publication. The circuit uses components from the time...