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Old 08-24-2007, 07:44 PM
Jacquesl Jacquesl is offline
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Join Date: Dec 2006
Posts: 29
Arrow 12v UPS relays Trigger, 1 ~ 11v no trigger

Hi,

Iím busy with some UPS circuit and I need it to switch a couple of relays on then the power is back.

http://www.allaboutcircuits.com/vol_3/chpt_7/5.html




Can I replace the triac with a transistor because I donít want to let the relays on until the power is down,

I basically want a easy method to trigger a couple of relays then the mains is back, currently Iím using a 10volt reformer on a 12v relay and if the mains drop the relay drop very fast, but the transformer is to small for 3 relays and then using 3 relays I hear a buzz sounds because it probably under power, in my circuit I have a regulated power supply and a small crap 10 Ė 11volt power supply just to do the relay work and the regulated power supply with huge caps is for the timer section and some other components


Purpose needed for:

1 ~ 11 volt - no trigger
12 volt - trigger


thx
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