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Old 20th May 2006, 10:30 PM   #31
lndm is offline lndm  Australia
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Jaymanaa, you ought to have your own TV show
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Old 20th May 2006, 11:38 PM   #32
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Hey, I'm just moving along fast (for me) and I'm hoping someone will stop me before the mushroom cloud appears. I don't know though, TV sounds better than pipefitting. We could call it Science with a middle aged bald guy! I don't know, maybe radio, what do you think?
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Old 22nd May 2006, 02:17 AM   #33
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Quote:
Originally posted by lndm
Umm <lndm picks up jaw from floor>, thats a large resistor.

Options:
1. Put a couple of 10W resistors in series and only turn on long enough to take measurements.

2. Use a circuit simulator, I like this method.

3. Make use of the fact that valves are resilient. Make best estimates on values, build your circuit, double check it, and switch on. I mean, if you have a large supply voltage, using that to calculate a dropping resistance for the supply (voltage to drop / current), and using the factory spec cathode resistance, you'll probably end up with less than the expected voltage on your devices anyway. Set your multimeter on a critical point in your circuit before turn on and watch it. You might chose the cathode resistor, so you can watch the current, or measure the anode voltage. If for some reason the voltage gets too high, just switch off.

Killing voltage with series resistance can work for a single ended circuit, but class AB draws a range of current and makes the choke input look like a better idea.

I also have 130V to kill. I use some series resistance to protect my rectifier from excess capacitance, I use some series resistance to reduce ripple, I use a choke that has series resistance. I have enough capacitance at the end to make it all good.

BTW, those are nice looking caps

Ok, I understand what you are saying now. With everything switched to choke input I dropped a bunch to 350v with a load of 140mA. The circuit I want to use is~ 130mA. I downloaded PSUII @ Duncan and as soon as I figure out how to use it I will try some different things. Thanks for your patience, Jay
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Old 22nd May 2006, 02:30 AM   #34
lndm is offline lndm  Australia
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No worries. I started to get into PSUII and after a while, I quit and went back to simming in CircuitMaker, YMMV. (I still respect Duncan's work).
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