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.
The circuit shown in the figure consists of a low voltage dropout (LDO) regulator for 200 mA using...
This circuit was obtained from an English magazine from 1979, but can be easily assembled today...
This sophisticated sinusoidal audio signal generator uses a Wien bridge configuration with an...