1024kHz and 4kHz square-wave output circuit

The circuit SJT is a 1024kHz warming crystal oscillator. Circuit is shown as the chart. As its output signal level is low, so the following transistor VTl is used as the buffer amplifier. The base bias resistor R2 of VTl, the load resistor R3, the emitter resistor R4 form the negative feedback resistor which is used to stabilize the DC operating point of VTl..

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