so i have been into the hobby of electronics for a long while… and i have been ordering things from electronic goldmine for a while to… when i got into alarms a while ago i have been dying for any mechanical horn. so i wanted to get an optical assembly one day and on the “SALE!!!” page caught my eye… it was a 120 VAC “muffin style” mechanical horn for 99 cents. i buy like 3 of them… one day when my cousin got mad at me he hooked an MOT up to them and burned them out(very sad!!!) so i go looking for these horns again, and they don’t carry them anymore…(ALSO SAD!!!) so i go looking in the alarm section and i see a scooter horn which i’m like meh about so something else catches my eye. “burglar alarm kits” which have a 9-15 volt horns similar to that. so i order the 9 dollar “secret alarm kit” and i notice something… no AC power supply on the board! so the horn must be DC right? well i touch a 9 volt to 2 terminals and i hear EEEEEEEH
so i hook up to the other terminal and the blue terminal and i hear CLICK!!! so that gets me curious…i get my 12 volt AC transformer and plug it in and touch it to the 2 termibnals and hear BAAAAAAAAA so i’m like YESSSS!!! AC HORN!!! so i will make a diagram below…
terminal diagram:
o o o
1 2 3
o
4
1:DC(case) 2:common/coil(blue) 3: AC(internal switch) 4:volume/tuning screw(case)
1-2 dc operation 2-3: AC operation 1-3 voltage output if on DC/AC operation 3-4 DEAD SHORT
so yeah!
