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Build Your Own 20-Second Time Delay Relay Circuit
Description
A delay relay is a device that remains active for a predetermined duration following its initial engagement. This particular delay relay consists of a straightforward, modifiable timer circuit which governs the actual operation of the relay. The duration is adjustable from zero to approximately 20 seconds, utilizing the components detailed within. The circuit’s current-carrying capability is principally constrained by the type of relay selected.
555 Timer IC
The 555 timer IC is a versatile integrated circuit commonly employed as a timing circuit. Its primary function is to generate a pulsed waveform with a frequency that can be precisely controlled. This IC incorporates a comparator, an operational amplifier, and a capacitor, allowing for the generation of various time delays. The 555 timer is a popular choice due to its ease of use, low cost, and availability in numerous package options. It's often used in applications such as timers, oscillators, and pulse generators.
Circuit Diagram
Parts:
- C1 10uf 16V Electrolytic Capacitor
- C2 0.01uf Ceramic Disc Capacitor
- R1 1 Meg Pot
- R2 10 K 1/4 Watt Resistor
- D1,D2 1N914 Diodes
- U1 555 Timer IC
- RELAY 9V Relay
- S1 Normally Open Push Button Switch
- MISC Board, Wire, Socket For U1
Notes:
- R1 regulates the duration of the active state.
- Alternative capacitors may be employed for C1 to modify the maximum duration.
- S1 initiates the timing cycle. S1 can be swapped with an NPN transistor for triggering the circuit from a computer or another circuit.
Security Warning
Please note that improper handling of electrical circuits can result in serious injury or damage to equipment. This circuit diagram is provided for informational purposes only. The user assumes all responsibility for its safe implementation. Exercise caution and adhere to all relevant safety guidelines.
Source
Circuit Diagram created by John Doe, sourced from Electronic Circuit Designs website.