Kevin -
There are a number of options available to you, but in all cases you will need an Amp meter in series the output of the PS7.
1. Obtain some automobile headlamps and use them as loads by placing them in series. Probably about 4 will do to produce the 3Ø Amp load.
2. Key down in CW on 2Øm into a dummy load. Adust the output of the TR-7 to draw about 25 to 3Ø Amps...Remember to have the Amp. meter in series with the output of the PS7.
3. Nichrome wire might be used but be prepared for very hot piece of wire. Go to: http://wiretron.com/ and calculate the AWG and length of Nichrome you'll need for a load. This is not the best method, but will work.
4. You might try using "Flood Lamps" for a load.
5. Use your imagination!
73,
Jay/AF2C
At 07:49 PM 3/18/06 -0800, you wrote:
Kevin LaHaie <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hello List, and thanks to all the suggestions on the PS7 supply that was shutting down around 4v.
The supply is working, and truthfully I am not certain what I did to make it work. I did examine the pass transistors, 3 of which had been replaced, and I think an emitter might have been shorted to the case on the way through the heatsink, or perhaps there was a short to the collector through the mica insualtor.
Anyway, it is now working, I have set the adjustment to 13.5v, and with full output on the TR7 in CW mode, a solid, steady voltage. Nice 40 minute QSO on 40 meters and report of great signal and fine audio was reported. Yeah!
Now, my final question!
What is the best way to set the regulation board to trip at 31 to 32 amps? I know there are lots of ways to load up the amp with calculated load resistance to make it draw 32 amps, but I hardly think that is the 'official' way.
any help to a tip / trick to make sure the supply will trip shortly after delivering 30 amps?
Thanks in advance!
73 Kevin K7ZS
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