Hi Chris and all! Today i made some test with a split ferrite ring and a ferrite rod in the center (see image) It is a kind of the Jensen UDT shown in your pdf. The partenered coil are on each half of the ring 500t/30awg and the primary are on the center rod (First one, the only that work, have 150t/21awg. Not the one on the photo). My frequency generator was an app i have on my phone. i use a small stereo to amplify the signal. I put a small 12v 2w bulb as the load (i bridge rectify the output) and it give me outstanding result! Apparently more out than in... The input on the primary was sine 353hz 5,41vac at 0.028amp. output on bulb load 7,76vdc at 0,141amp. Here i just want to clarify that my mesure instrument are an ac/dc clamp meter for the amp draw and an dmm for the voltage.... surely not the best instrument for accuracy. But the lite have a nice glow. anyhow it stunt me a bit an i try to replace the load for a 6v lead battery to see if i could charge it... it was a big mistake! Yes it give a charge to the battery but after few second the amp draw on the primary goes up to near 2 amps! The big problem is now i am not able to bring it back to the previous state. I try many thing; change frequency, play with the gap, try MANY different primary winding nothing seems to be done to make it work again. Chris did it ever happen to you?? If so what did you do to bring it back "to life"? I suspect my small stereo... because now with all my "high" amp test, the output of my stereo seem to be blown... Now im wathing to receive my 12v 180w audio amply order 2 weeks ago on eBay... be sure this time i will protect it with some fuse!! Ciao!
|