In this particular article we discover a basic IC 555 set/reset application circuit for triggering or deactivating a relay alternately.
This electronic set reset circuit is very easy, convenient to apply and very beneficial.
It could actually offer you a lot of applications choices in situations where it might be essential to toggle (turn on and off) any electrical or electronic device
Being familiar with the ON-OFF or set/reset operation of the timer switch 555
To function the timer 555. Within this widely used built-in circuit there a relay is attached via a BJT with the purpose of linking or disconnecting of the device to be regulated.
Manual activation might be carried out via two momentary push ON switches. One provides to trigger the device under control and the other for deactivating the same.
When the circuit is operating, activation of switch 1 (SW1) makes it possible for the pin2 of 555 connected to 12 volts usually, pulling it to 0 volts such that the timer output (pin3) is triggered, enabling voltage 12 volts here. Thus, high output triggers the relay 555 by means of the transistor Q1 (which saturates)
For disabling the relay, just switch 2 (SW2) is pressed.
This puts pin 6 of timer 555, at a high voltage briefly. The output of 555 that is pin3 now gets a low voltage level at its output, deactivating the transistor in the course, and clearing of the relay.
Note: In the description of the circuit, it is offered to be provided with 12 volts, but it surely might work well despite a voltage range from 5-15 volts. One can utilize a 9 volt battery PP3, therefore have a much handy circuit.
Number of circuit components for the above described IC 555 set reset circuit
- Resistors: R1 = R2 = 3.3M, R3 = 10K, R4 = 1K
- Capacitors: C1 = 10nF
- Transistor: BC547
- Rectifier Diode: 1N4148 or equivalent
- Diode LED: 1 red
- Integrated circuit: NE555
- Relay: 1 with identical voltage to the supply voltage of the circuit
- Switches: 2 momentary or similar push ON contact. (SW1, SW2)
- Other: battery connectors (CN3), switches (CN1, CN2). Check out the recent chart.
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