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Located in China?¡¥s Liushi, Any Electronics is a corporation that prides itself on regularly adapting to technological improvement. The firm provides solutions in machinery manufacturing, motor program manage, distribution transmission, handle device, oil and mining, automation market, solar handle, lighting handle and also other such regions. The company also supplies new solution improvement and OEM solutions. All solutions offered are strictly according to ISO9002.
12vdc time delay relay off-delay relay
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I'm holding a relay coil shut with a 12VDC / 500ma transformer (wall wort). The output of the relay is connected to a normally closed zone in my alarm system. I use this to tell me if the power has gone off while I'm not at home. However, with the transformer and relay only, I get no "power off" delay before the zone goes into alarm. Ideally, I'd like to get about a 30-60 second delay so that it won't go into alarm for short power outages. I don't have any way to do this through the alarm panel, so I need an electronic solution. I'm aware of a device which already does this (http://www.smarthome.com/7154.html) but I think I can do it cheaper with a capacitor (2, 3 .. ?) and a bleed resistor. Does anyone know the math and/or can you provide an answer to what size caps I need?
And got the following answer:
Trying to answer but YA taking breather. Or is it??? Edit: No it just doesn't want to display my answer. Try again... I may be reading your question wrong, but it looks like you want to charge the capacitor from the power supply, in such a way that if the power goes off the voltage on the capacitor will hold the relay closed for 30-60 seconds, until the capacitor discharges. That would work, but it is clunky, and you will need a big capacitor. Assuming that the relay will continue to hold closed until the voltage drops to about 60% of normal, C = 2 * T / R where R = the coil resistance of the relay Let's say you have a very small, low power relay with coil resistance 1200 ohms. For 30 seconds: C = 60 / 1200 = 0.05F = 50,000uF You would probably go for an aluminium electrolytic cap 47,000 uF, 16V. If your relay has a lower resistance coil, which it probably does, you will need a bigger capacitor, or several in parallel. You may need to charge the cap through a rectifier diode like 1N4001, so that when the power fails it doesn't discharge back through the power supply. The way I would do it is to use a darlington transistor, FET or solid-state relay to switch the line. Then you can do the same thing but with a much smaller capacitor, and you can run it from a battery or power direct from mains through a capacitor / rectifier circuit. Don't try that latter idea unless you know what I'm talking about, it's very easy to kill yourself...
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