stupidsalmon Posted April 9, 2006 Report Share Posted April 9, 2006 Any electricians out there?.... I need to make a circuit to automatically turn a 9V DC motor on and off. I'd also like to be able to adjust the timing of how long the motor stays on and off for, Any help would be much appreciated, Kind Regards SS Quote Link to comment Share on other sites More sharing options...
Axe Posted April 9, 2006 Report Share Posted April 9, 2006 I have done this on various pecies of equipment, its cheap and faitly easy to do. If your not electrically minded the best way is to seek out a local Maplin store or find them online. They do a series of projects and kits and amongst them is a timer circuit. It contains all you need, Vero Board, Timer IC Chip, Resistors, Plans, etc. All you need to provide is the connections, i.e. battery supply lead, on/off switch/ etc. They work great and you can vary the amount of time the unit stays on. If the variable time is not long enough, changing one of the resisitors for a higher value will give a longer time range. Quote Link to comment Share on other sites More sharing options...
stupidsalmon Posted April 9, 2006 Author Report Share Posted April 9, 2006 Thanks Axe, got any plans of the circuits and components you've used?? Cheers SS Quote Link to comment Share on other sites More sharing options...
Axe Posted April 9, 2006 Report Share Posted April 9, 2006 Struth, to be honest it was years ago I last played around with them. Component wise I would have to dismantle the unti I built, to have a look. Plans were thrown away, as they come with the kit. From memory, it is very simple using a standard timer 8 Pin IC. This requires the usual power feed with resistors and then the a variable resistor for the time control, an on/off feed, and a transistor for the switching control. If your using it for a large motor, you'll need to use relay. I'll have a look on the Maplin website for you and see if I can find the link. I beleive they do mail order. Quote Link to comment Share on other sites More sharing options...
Axe Posted April 9, 2006 Report Share Posted April 9, 2006 IT seems they have inproved the kit somewhat, it is adjustable from 2 seconds to 15 mins. Have a look here: Maplin Timer kit Quote Link to comment Share on other sites More sharing options...
stupidsalmon Posted April 9, 2006 Author Report Share Posted April 9, 2006 Ok no worries Axe, Thanks for the link, Would this one work okay: MK111 Adjustable Timer with Relay Output in conjunction with a motor i want to run at around 9V DC. Because it says its power supply is 12V DC would i need to put some kind of DC step up and step down transformers into the circuit so the motor doesn't work too hard?? Cheers SS Quote Link to comment Share on other sites More sharing options...
Axe Posted April 9, 2006 Report Share Posted April 9, 2006 Its no good for what you want, the kit I linked to is what you need. Dont forget that the relay is there as a switch so you can run an independent 9v supply to be switched by the relay. Or you can use another relay switched by the first, if the motor draws a heavy current. If its a light load you could use a step down transformer or a simple resistor with a bridging capacitor. What is the application? Quote Link to comment Share on other sites More sharing options...
stupidsalmon Posted April 9, 2006 Author Report Share Posted April 9, 2006 a homemade pigeon pecker. I've got the movement from the motor in the deek working fine, i just need something to turn the power supply to it on and off. SS Quote Link to comment Share on other sites More sharing options...
Axe Posted April 9, 2006 Report Share Posted April 9, 2006 You could use both kits in conjuction to acheive a permenant timed on off action. Or have a look in the IC cicuits book which is also available from maplin. Quote Link to comment Share on other sites More sharing options...
stupidsalmon Posted April 9, 2006 Author Report Share Posted April 9, 2006 Sorry, im lost axe?? I thought the purpose of those circuits was to create their own permanent on-off-on-off etc. circuit?? Please enlighten me :*) SS Quote Link to comment Share on other sites More sharing options...
Axe Posted April 9, 2006 Report Share Posted April 9, 2006 The two circuits differ as one is designed to give a short output every so often with a variable time of up to 5 seconds. The second, the one I listed, is designed to give a permanent output, variable up to 15 minutes. If the first circuit can be altered to provide a longer variable time then you can combine this with the second circuit to to give for example : 30seconds runtime every 2 minutes. If i've understood the maplin site correctly. Quote Link to comment Share on other sites More sharing options...
stupidsalmon Posted April 10, 2006 Author Report Share Posted April 10, 2006 Ok, read you loud and clear now axe, cheers SS Quote Link to comment Share on other sites More sharing options...
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