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Old 28th February 2005, 08:18 PM   #1
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Default heater wiring

I am using a seperate powersuply for a 2a3 design. I would like to use an octal din to connect them. I am concerned about the
wiring from the heater supplies. Is it a bad idea to run the heater wiring in the same cable as the other B+ lines ?
any sugestions ?
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Old 28th February 2005, 09:48 PM   #2
Sherman is offline Sherman  United States
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I'm no expert but I would think the chance of inducing hum would be much greater if the heater wires were in the same cable as the B+. I would run them separately. If that isn't possible then maybe twisting the AC wires together and shielding the DC would be enough.
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Old 1st March 2005, 11:05 PM   #3
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Default hum , hum

That sounds practical .I saw a picture in the photo galery and he used just one cable to teh socket. I gues you would have to prototype and test different methods . I assume you need a load on the power supply when testing . What would be a good way to just fire up the powersupply only ?
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Old 2nd March 2005, 01:34 AM   #4
Sherman is offline Sherman  United States
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Default Re: hum , hum

Quote:
Originally posted by tenderland
... he used just one cable to teh socket. I gues you would have to prototype and test different methods . I assume you need a load on the power supply when testing ...

If all you want to do is see if the heater AC is junking up the B+ you could just put a power resistor on each to load them a bit then put a scope on the B+ to see if you have any interference. I don't think you'd have to match the load exactly to your real-life set up.
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Old 2nd March 2005, 01:57 AM   #5
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After reviewing the power suply section of the print it looks like ther is a voltage divider loading it . On the B+ line ther is a 220 k in series with 68k to ground. I think that should be ok , yes ?
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Old 2nd March 2005, 12:58 PM   #6
Sherman is offline Sherman  United States
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Default Re: load

Quote:
Originally posted by tenderland
After reviewing the power suply section of the print it looks like ther is a voltage divider loading it . On the B+ line ther is a 220 k in series with 68k to ground. I think that should be ok , yes ?

Depends on the wattage but yes I think it should be OK. Report back on your results. I would be very interested in how it works out.
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Old 2nd March 2005, 08:14 PM   #7
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Default heater

I recieved the iron today , tubes on the way , detailed report in about 2 weeks
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