How to build Photo Timer Circuit

November 18, 2010 - category: Timer

Circuit diagram

Photo Timer Circuit-Circuit diagram

Time is set by potentiometer R2 which provides a range or 1 sec. To 100 seconds with timing capacitor C1 of 100uF. The output at pin 3 is normally low and the relay is held off. A momentary push on switch S1 energies the relay which is held closed for a time 1.1 X (R1+R2). C1 and then released. The exact length of the timing interval will depend on the actual capacitance of C1. Most electrolytic capacitors are rated on the basis of minimum guaranteed value and the actual value may be higher. The circuit should be calibrated for various positions of the control knob of R2 after the timing capacitor has had a chance to age. Once the capacitor has reached its stable value, the timings provided should be well within the photographic requirements.


  • C1 - 100uF, 25V electrolytic
  • C2 - 0.01uF, disc ceramic
  • D1, D2 - DR50 or 1N4001
  • R!,R2 - 10K ohms, ¼ watts
  • R3 - 1 M ohms, potentiometer
  • RLY1 - 12V, DC relay, operating current less than 200mA
  • S1 - Push-to-on switch
  • U1 - NE555 timer IC
  • P1 & P2 are for exposure lamp ckt.

author: Ravi Sumithraarachchi, ravi@ualink.lk
circuit from http://www.electronics-lab.com/

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