12V NE555 Adjustable Delay Relay Timer

The 12V NE555 Adjustable Delay Relay Timer Module is a compact and reliable solution for precise timing control in a variety of applications. Powered by the industry-standard NE555 timer IC, this module offers adjustable delay times ranging from 0 to 10 seconds (extendable by modifying capacitance). It is designed for ease of use, featuring a simple interface with a screw potentiometer for fine-tuning and LED indicators for power and relay status. Ideal for automation, automotive, and DIY electronics projects, this module ensures accurate timing and robust performance.

Key Features

• NE555 Timer IC: Utilizes the high-performance NE555 chip for precise pulse generation and timing, with excellent temperature stability (0.005% / °C).
• Adjustable Delay: Set delay times from 0 to 10 seconds using the onboard multi-turn potentiometer; extendable up to ~90 seconds by replacing the capacitor (T = 1.1RC).
• High Load Capacity: Controls AC loads up to 250V/10A or DC loads up to 30V/10A, with a maximum load of 2200W.
• LED Indicators: Includes power and relay trigger LEDs for easy monitoring of module operation.
• Compact Design: Measures approximately 68 x 21 x 18 mm, perfect for integration into tight spaces.
• Protective Features: Equipped with relay freewheeling protection and supports safe operation in automotive applications to prevent damage from high inrush currents.

Technical Specifications

• Operating Voltage: 12V DC (10V–14.5V acceptable).
• Control Voltage: AC 0–250V (max. 10A), DC 0–30V (max. 10A).
• Max Load: 2200W.
• Delay Range: 0–10 seconds (adjustable via potentiometer; extendable by changing capacitor C1).
• Standby Current: ~5mA.
• Operating Current: ~45mA.
• Module Dimensions: 68 x 21 x 18 mm (L x W x H, including potentiometer).
• Weight: Approximately 34g.
• Main Chip: NE555, configured for monostable operation.
• Delay Formula: T = 1.1RC (e.g., 100µF capacitor with 100KΩ resistor yields ~11 seconds).

Operating Modes

• Monostable Mode: When powered or triggered, the relay activates immediately, remains on for the set delay period (0–10 seconds), then deactivates. Output states:
  • During Delay: Normally open (NO) connects to common (COM); normally closed (NC) disconnects.
  • After Delay: NO disconnects from COM; NC connects to COM.
• Trigger Behavior: The relay remains in its state until power is removed or a new trigger signal is applied (if configured for external triggering). External trigger signals can be high-level pulses or level-based, independent of the power supply system.

Applications

• Automotive: Delays ignition or component activation to prevent damage from sudden high currents.
• Automation: Controls motors, lights, or relays with precise timing to avoid power surges.
• Security Systems: Introduces delays for alarm activation/deactivation to reduce false triggers.
• Lighting Control: Delays light activation for simulated occupancy or energy-saving purposes.
• DIY Electronics: Ideal for hobbyists building custom timing circuits or pulse generators.

Setup and Adjustment

• Wiring: Connect GND (negative) and VCC (positive 12V) for power. Relay outputs are labeled COM (common), NO (normally open), and NC (normally closed). Use NO for delayed power-on or NC for immediate power-on with delayed power-off.
• Delay Adjustment: Turn the multi-turn potentiometer counterclockwise to increase the delay time. For longer delays, replace the onboard capacitor (C1) with a higher value (e.g., 10µF for up to ~1 second).
• Triggering: Supports external high-level trigger signals (3.0V–12V) for applications requiring synchronized timing.

Important Notes

• Output Type: The relay provides passive contacts (uncharged), designed to control circuit on/off states without supplying power.
• Documentation: Some units may ship without detailed instructions. Refer to the NE555 datasheet or online resources for circuit details and advanced modifications.
• Variations: Relay types (e.g., JQC-3FF-S-Z or SRD-12VDC-SL-C) may vary by supplier, but functionality remains consistent.
• Quality: Features high-quality double-sided PCB and soldering for reliable performance.

Package Contents

• 1 x 12V NE555 Adjustable Delay Relay Timer Module

This 12V NE555 Adjustable Delay Relay Timer Module is a versatile and cost-effective solution for precise timing control. Its compact size, adjustable delay, and robust design make it perfect for automotive, industrial, and hobbyist applications.