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I need a little challange, I'll help you. I would recommend instead of the relay thou, to use either a bi-polar power transistor or a power mosfet, as at the rate you will be pulsing the relay it won't last too long. The mechanical life of good relays is about 100,000 operations. Do you need to pulse the 15 amps or is that the capacity of the supply? I can invision using a 556 timer or a pair of 555 timers and a few other parts.Dimitrio said:Hi all, im looking to build a 24v DC timer circuit and could use a diagram if possible. I need to pulse a relay for 1 second with a variable delay between pulses of approx 3-20 seconds. The supply will be 24vdc and 15 amps.
All help appreciated.
Sorry for the delay in responding, I was ill for 1 day.Dimitrio said:100k operations is more than enough, the relay needs to take 15 amps across the contacts if possible . My understanding of electronics is fairly basic, ive not delved into mosfets and such, if you think its the way to go then so be it.
Thanks for your interest
Dimitrio said:A couple of questions - i understand the caps around the 7812 for smoothing, but what does the diode above it do?
Dimitrio said:Just a little update, the circuit has been tested and withstood all i could throw at it. I`m very pleased with it.