Rocket Crystal Radio

The TDA7021T integrated radio receiver circuit is designed for portable radios, both stereo and mono, where minimal peripheral components are essential for achieving small dimensions and low cost. It is fully compatible. The TDA7021T is a highly integrated radio receiver...

In the first circuit, the BC548 transistor is configured as a Colpitts oscillator, with the frequency being adjusted through the use of a crystal. A high-quality crystal will produce high-frequency oscillations, and the output at the collector is rectified...

The crystal used in the topology of Figure 1 can be either a fundamental AT-CUT or BT-CUT. A BT-CUT crystal has poor frequency stability over temperature compared to an AT-CUT. This topology uses a parallel crystal and not a...

This simple and inexpensive crystal oscillator consists of one-third of a 7404 IC, four resistors, and a crystal. The inverters are biased into their linear regions by resistors R1 to R4, while the crystal provides the necessary feedback. Oscillation...

A /xPC 1651G IC operates in the fundamental mode with an experimental crystal at 330 MHz. The 56-to-270 pF capacitor is not critical; about +1 dBm RF output is available. The /xPC 1651G integrated circuit (IC) is designed to function...

To generate a 1 MHz square wave, it is advisable to use a higher frequency crystal and divide it down for two reasons: (1) 4 MHz crystals are generally more affordable and easier to procure than 1 MHz crystals;...