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 oscillator takes advantage of the inductance of a high impedance magnetic earphone to...
The transducer used in this configuration that appears elsewhere on this site is a piezoelectric...
November 2016 - Mouser Electronics has in stock the Toshiba Bluetooth TC35670 and 35675...