NE555 5V Adjustable Delay Timer Relay Module - Monostable 0-10 Seconds

Specifications

• Operating Voltage: 5V DC

• Timing Chip: NE555 Monostable Oscillator

• Delay Range: 0 to 10 seconds (Adjustable)

• Max Relay Load (AC): 10A @ 250V AC (Approx 2200W max)

• Max Relay Load (DC): 10A @ 30V DC

• Indicators: 1 x Power Status LED, 1 x Relay Status LED

• Connections: Heavy-duty screw terminals for both power input and relay output

Key Applications and Projects

• Vehicle Electronics: Delaying the startup of a dashcam or aftermarket radio until a few seconds after the engine has cranked, protecting sensitive electronics from severe voltage dips. (Note: Requires a 12V to 5V converter for car use).

• Audio Amplifier Protection: Staggering the power to speaker protection circuits to prevent the loud "thump" sound when an amplifier is first turned on.

• Sequential Power Systems: Daisy-chaining multiple modules to turn on heavy motors or lighting arrays one by one to prevent tripping your main circuit breaker.

Unlock New Capabilities (Project Evolution)

• Extend the Timer: Need a delay longer than 10 seconds? The timing is dictated by the large black cylindrical capacitor next to the potentiometer. By desoldering that capacitor and replacing it with one of a larger value (e.g., swapping a 100uF cap for a 1000uF cap), you can easily multiply your maximum delay time!

Package Includes:

• 1 x NE555 5V Adjustable Time Delay Relay Module

Frequently Asked Questions (FAQ)

1. Can I use this module with a 12V power supply?
   No, this specific version is designed for 5V DC. Using 12V will damage the module.
2. How do I increase the delay beyond 10 seconds?
   You can replace the electrolytic capacitor with a higher value (e.g., 220uF) to extend the RC time constant.
3. Does the timing start when I press a button?
   By default, timing starts as soon as the module receives 5V power.
4. Is the relay isolated from the timer circuit?
   Yes, the relay provides dry contact isolation between the 5V timer and the load.
5. Can I trigger this with a GPIO pin from an Arduino?
   Yes, you can power the module via a transistor switched by an Arduino pin.
6. What happens if the power is cut mid-delay?
   The timer resets immediately. It will start the full delay cycle again once power is restored.
7. Is the potentiometer multi-turn?
   Yes, it usually features a multi-turn trimmer for fine-tuning the seconds.
8. Can it handle a 220V AC load?
   Yes, the relay is rated for up to 10A at 250V AC.
9. Does it consume power when the relay is off?
   It consumes a very small amount (quiescent current) for the NE555 IC and Power LED.
10. Can I use this for a turn-off delay instead of a turn-on delay? Yes, by using the NC (Normally Closed) terminal, the load will stay on for the duration and then turn off.
11. How accurate is the 10-second limit?
    It is based on an RC circuit (Resistor-Capacitor), so it is very accurate for hobbyist use, though it may drift slightly with extreme temperature changes.
12. What is the default state of the relay?
    Upon power-on, the relay stays in its "shelf" state (COM connected to NC) until the timer elapses.
13. Can I trigger the timer without cycling the power?
    Not without modifying the board to pulse the trigger pin of the NE555.
14. Is there a visual indicator for when the timer is finished?
    Yes, the relay status LED lights up once the delay is complete and the relay switches.
15. What is the maximum current the relay can switch?
    10 Amperes.
16. Will this work with a 5V power bank?
    Yes, it is perfect for portable 5V projects.
17. Can I use this for an interval timer (On-Off-On-Off)?
    No, this is a monostable (one-shot) timer. For cycling, you need an Astable version.
18. Does the module get hot during operation?
    The NE555 stays cool; the relay may get slightly warm if switching high-current loads for long periods.
19. What size are the mounting holes?
    Typically 3mm, standard for M3 spacers.
20. Is this compatible with Raspberry Pi?
    Yes, it can be powered by the 5V rail of the Raspberry Pi