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I have a project that I'm working on and it requires a dpdt switch input to trigger a relay, however one of these switches needs to lag behind the other switch, eg sw1a is a normal on off switch and sw1b needs a delayed switch off of about 2 or 3 seconds. Severe brain block has got me on this one, any simple circuits would be gratefully recieved. Thanks |
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| 0 recommendations | Message 2 of 10 in Discussion |
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Just what I was after, knocked the circuit up on a breadboard this afternoon. Now all I need to do is make six of them! |
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Another point to note with the diagram is that the circuit is not capable of driving relays directly, as shown, a relay will make the circuit 'lock-up'. To cure this a 1k resistor coming off of pin 3 is used to feed the base of an NPN transistor which in turn switches a relay. I'll post an amended diagram on my site in the near future. Thanks again for the diagram. |
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| 0 recommendations | Message 5 of 10 in Discussion |
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dont forget to fit a diode across the relay coil to protect your npn switching transistor(or pnp......) regards mike |
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good point, although the relay modules I use already have the diode built in, I also used an optoisolator but this will also need a diode (unless its an opto-triac) I'll have to ammend that diagram soon and post it here, I built the circuit and modified it to suit, works well. |
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Hi Ken, any chance of posting the schematic for this again? I seem to have lost it Thanks |
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| 0 recommendations | Message 9 of 10 in Discussion |
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Finally uploaded the amended timer plus diagram, it's in the projects folder |
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