J
John Popelish
- Jan 1, 1970
- 0
AB said:Still a newbie so please bear with me....
I have this 12VDC alarm panel that limits the siren output draw to
110mA. As this is not adequate for me, I replaced the siren with a
beefier model that draws 750mA and added a small strobe light that
draws 150 mA...so 900mA total draw.
I rigged a small relay to separate the alarm circuit from the new
siren/strobe...this one here:
http://www.radioshack.com/product/i...=12vdc+relay&kw=12vdc+relay&parentPage=search
I also got a 1000mA rated wall wart to power the new setup. My
question is that since I'm pretty close to the maximum draw rating of
both the power supply and the relay...will the relay get hot and burn?
The circuit will only be in use for 12 minutes maximum and then the
alarm panel resets, but I really can't run the siren for 12 minutes to
test it.
What do you all think, should I be OK with this setup for intermittant
use?
If your current values for your loads includes the initial
inrush, then I think you'll be fine. But I am worried that
the strobe light includes a big capacitor that will suck
lots of current for a few milliseconds, right while those
contacts are bouncing to a stop, and that will eat the
contacts. I think I would look for a 3 to 5 amp contact
rated relay. That are pretty common. Or drive two of these
in parallel and use one for the horn and one for the strobe.