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Delay circuit with ransistor

Here the delay circuit, the delay time from 0 to 120 minutes continuously adjustable delay device can be used as household appliances. The circuit structure is simple, reliable, fully meet the general home use.
How it works: Delay in part by the BG1, BG2 and capacitor C form the composite of Miller integrator. Power on the former C terminal voltage is zero, power is on BG3, BG4 conduction, the relay pull-J, while capacitor C is charged, the charging current through R2, C, R constitutes a loop, a point of potential increased, causing b point potential drop, b point potential of a point drop but also limited potential to rise. a, b are two potential result of mutual compensation of up to a point potential is very small, almost like a constant charge current. When the b point potential up to 10V or so, BG3, BG4 close to the deadline, the release of the relay J, delay the process ends. Click the button AN, capacitor C rapidly discharges through D1, J pull the relay to start the process of the next delay.

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Delay circuit with ransistor