OK, so I'm trying out the old step-down-and-then-step-up trick that you all seem to be using to get high voltages from cheap transformers...
I've heard people say that sometimes their transformers overheat, melt, etc., and I'm wondering what makes or breaks this setup?
So I got two 25VA Amvecos from Digi-Key (a 115+115:12+12 and a 115+115:15+15) and hooked them up like this: AC from the wall > 115:12 > 15:230 > 9.05K load (four 9K1/1W resistors I had lying around, in series/parallel)
I measured 120V/37mA coming out of the wall, 14.7V/263mA coming out of the first transformer and into the second, and 184V/20.2mA coming out of the second transformer and into the 9.5 KOhm load, which agrees with Ohm's Law.
Now, my questions are: Is this OK to do? Will conditions change much when I hook up a rectifier and filter caps instead of the purely resistive load? Neither transformer showed any signs of heat (at least not anything I could notice by touching them), but I only left them plugged in for about 5 minutes or so. I've read posts here from people who say the transformers overheat after 4 or 5 hours of being on! Does that make sense? What determines how much the transformers will overheat and how long it will take for them to get there?
So many questions :?...
Thanks, guys!
Peace,
Al.
I've heard people say that sometimes their transformers overheat, melt, etc., and I'm wondering what makes or breaks this setup?
So I got two 25VA Amvecos from Digi-Key (a 115+115:12+12 and a 115+115:15+15) and hooked them up like this: AC from the wall > 115:12 > 15:230 > 9.05K load (four 9K1/1W resistors I had lying around, in series/parallel)
I measured 120V/37mA coming out of the wall, 14.7V/263mA coming out of the first transformer and into the second, and 184V/20.2mA coming out of the second transformer and into the 9.5 KOhm load, which agrees with Ohm's Law.
Now, my questions are: Is this OK to do? Will conditions change much when I hook up a rectifier and filter caps instead of the purely resistive load? Neither transformer showed any signs of heat (at least not anything I could notice by touching them), but I only left them plugged in for about 5 minutes or so. I've read posts here from people who say the transformers overheat after 4 or 5 hours of being on! Does that make sense? What determines how much the transformers will overheat and how long it will take for them to get there?
So many questions :?...
Thanks, guys!
Peace,
Al.