crystal controlled timebase


Posted on Feb 6, 2014

This circuit provides a 50 Hz timebase signal that is independent from the power line frequency. It is designed to provide the 50 Hz signal for electronic circuits which function only with this clock frequency (mostly circuits and electronic devices with european standards). It is popularly used for clock and timing applications. By carefully anal


crystal controlled timebase
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ysing the circuit diagram, you can see that IC1 works as crystal controlled oscillator while IC2 functions as a 214 divider. The crystal frequency can be finely adjusted within 20 Hz range through the trimmer capacitor C2. Calibration is simple and can be done in two different ways. First method: if you have a digital frequency counter, connect it to pin 7 of IC1 (TEST output on the printed circuit board) and adjust trimmer cap C2 until the frequency being displayed is 204. 800 Hz.




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