Oscillator operates from one cell

Posted on Apr 30, 2012

The circuit is powered by a single 1.35 V mercury cell and provides a 1 V square-wave output. As shown, the crystal is a tuned circuit between transistors Ql and Q2, which are connected in the common-emitter configuration. Positive feedback provided by means of R permits oscillation.

Oscillator operates from one cell
Click here to download the full size of the above Circuit.

The signal at the collector of Q2 is squared by Q3, which switches between cutoff and saturation. R7 permits short-circuit-proof operation.

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