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Relay timer switch circuit.
12v time delay relay adjustable on off timer using 555 astable mode in this circuit a timer with cyclic on off operations is designed.
The output load is driven by the relay switch which is in turn controlled by the timer circuit.
Dc 6 30v digital led relay board cycle timing circuit switch timer delay trigger module micro usb 5v 13 39.
Manual activation is performed through two momentary contact switches.
The circuit is based on the rc time delay and zener controlled switch.
How the on off switch circuit works.
The 555 timer is configured as a monostable multivibrator.
Since the project only involves assembling a simple circuit by following the schematic it will only take an hour to make.
The timer activates a relay through a bipolar transistor in order to connect or disconnect the device we want to control.
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To prevent 555 timer from flyback current in the relay use a diode before the relay.
The working is very simple and is explained below.
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Switch 1 sw1 is used to enable and switch 2 sw2 is used to.
Some 555 versions may get damaged because of this.
Time delay relay can provide a short delay after power is turned on and before switching on the device.