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Electronics Forum / Basics / May 2006Anyone know of a good cheap relay for 120VAC needing low coil power
I'm trying to use my little AVR to control up to 12 120VAC loads, up to 5 amps. Does anyone know of a cheap (< $5 US) relay (SPST-NO) that only needs 40 mA or less to activate? My Tyco T77 relays need 90 mA at 5VDC to pull in the contacts, it turns out, so the processor dies. The lowest I've found on-line is 60 mA. I don't have a harsh environment, or rapid switching requirements, just need a simple on-off relay. I'm switching banks of lights, should look cool if I can get it to work. Thanks for any advice. Mike Ross <mike_l_rossREMOVE@REMOVEsbcglobal.net > I'm trying to use my little AVR to control up to 12 120VAC loads, up to 5 > amps. Does anyone know of a cheap (< $5 US) relay (SPST-NO) that only [quoted text clipped - 4 lines] > banks of lights, should look cool if I can get it to work. Thanks for any > advice. ** For heaven's sake - add a darn relay driver IC ! AND DO NOT RESTRICT REPLIES LIKE YOU HAVE !!!! ARRRRRRRRRGGGGGGGGHHHHHHH !!!! ....... Phil > I'm trying to use my little AVR to control up to 12 120VAC loads, up to 5 > amps. Does anyone know of a cheap (< $5 US) relay (SPST-NO) that only > needs 40 mA or less to activate? a solid-state relay. > My Tyco T77 relays need 90 mA at 5VDC to > pull in the contacts, it turns out, so the processor dies. The lowest I've > found on-line is 60 mA. I don't have a harsh environment, or rapid > switching requirements, just need a simple on-off relay. I'm switching > banks of lights, should look cool if I can get it to work. Thanks for any > advice. For switching lights an optocoupled triac is probably the way to go (cheeper than SSR), look at the MOC3010 data sheet.  SignatureBye. Jasen > > I'm trying to use my little AVR to control up to 12 120VAC loads, up to 5 > > amps. Does anyone know of a cheap (< $5 US) relay (SPST-NO) that only [quoted text clipped - 11 lines] > For switching lights an optocoupled triac is probably the way to go (cheeper > than SSR), look at the MOC3010 data sheet. Don't forget to derate the current rating for lamp loads. Graham |
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