I need a small supply (~ 1.5KV) to run a Motorola UHF Amp (pair 8560's). My old microwave oven croaked so I salvaged the power transformer. It looks OK, but I wonder if anyone has used one in a suppl
For cost reasons, Microwave oven xformers are optimized specifically for their use in a microwave oven. They are OK as long as they supply their nominal power to a load. In the standby mode, they get
Various thoughts, in no particular order. Typically, the secondary gives 2.2-2.5kV across the caps with FWB. I've played with a handful of them. Hipot testing the secondary with the wire to the frame
I noticed that the XFMR drew a lot of current when I did a no-load voltage test. It seemed to go up rapidly between 90 vac and 120 vac. (I have a 20 Amp GR Variac with both E & I meters). That could
Would it not be possible to use a relay in the primary to disconnect the transformer during standby? Of course, the contacts on the relay would have to be able to "handle" the current. This should
Hi All, another technique is using a resistor in series with the primary to drop the voltage enough to prevent the transformer heating during standby. A relay would be required to short the resistor
Guys.... it pains me to see you screw around with a transformer which was designed to cook food. Save your pennies, get a real Peter Dahl transformer and be done with it. Build it into a universal po
Guys.... it pains me to see you screw around with a transformer which was designed to cook food. Save your pennies, get a real Peter Dahl transformer and be done with it. Build it into a universal po
Guys.... it pains me to see you screw around with a transformer which was designed to cook food. Save your pennies, get a real Peter Dahl transformer and be done with it. Build it into a universal p
I can very well understand the temptation to use MOTs, since they are so widely available for free, and let's face it, most of us are cheapskates! But please do understand what MOTs are: They are the
I agree about MOTs. It didn't take me long to decide that, for a big amplifier, they're just not worth the bother. My home-rewound plate xfmr has multiple taps on both primary windings and the second
So if you take a MOT with a 120V primary and series it with an identical MOT and plug it into 120V we have solved the flux problem.... correct? Now the issue is what is the resultant individual secon
Doubling up does solve the flux problem, but means a lot of resistance - MOTs usually start with high Rs for their rating. More transformers in parallel can compensate so size is then the downside. N
Guys: I'm still using an Amana uwave oven transformer (something in the 1000 Watts class) which I had for the last 20 years. It feeds a 4-1000 amplifier and works as well as when it was new! Sooooo,
Hi Steve, Carl, and all, Normally, 10 or 15% reduction in volts is enough to bring the magnetising current down, Not really, with MOTs. It would still have an excessive magnetizing current! I just to
I can't pretend my comment came from such detailed understanding or analysis - I just wound the primary volts down until the (no load) primary current dropped noticeably and the core didn't fry witho