Three single junction transistor time relay circuits

Three single-junction transistor time relay circuits It uses pulse charging circuit, and therefore can be done for a long time delay, maximum up to tens of minutes. FIG unijunctions VTi and other groups into the first stage delay circuit, charging the

capacitor Cl way exponential change; VTz other components of the second stage delay circuit capacitor Cz charging method for the pulse charging, the terminal voltage step change. The total time of the circuit, the equivalent of a two-stage relaxation oscillator delay time of the product.

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