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 old documentation, but the regulator may be 78xx series equivalent and the...
This interesting automotive alarm was found in an English publication from the 1980s. The circuit...
This circuit makes use of a PLL 567 and the components must be calculated according to the desired...