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Old 11th December 2006, 07:20 PM   #1
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Default Is this OK for a heater supply?

Hey all. I just modeled a a heater supply for my Aikido headphone amp. It's pretty much a result of my neanderthal thinking. My mains AC doesn't swing a whole lot so I don't think a regulated supply is absolutely necessary. Anyway, would you call this idea stupid? What should I do differently?
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Old 11th December 2006, 07:34 PM   #2
SY is offline SY  United States
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It strikes me that this is more complicated/expensive than a regulator. Additionally, you'll want to take care of common mode noise as long as you're going to all this trouble.
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Old 11th December 2006, 07:41 PM   #3
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Nah, I just happen to have all this stuff available from my junk box. But yes, I did think it may be smarter to just built a regulator circuit. I've never dealt with DC heaters before, so I'm a little lost here.
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Old 11th December 2006, 07:51 PM   #4
SY is offline SY  United States
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An LM317 will work wonders.LM350 if you've got unusually high current demands.
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Old 11th December 2006, 08:28 PM   #5
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what voltage are those heaters operatring at? it seems like at heater voltages, you can use FAR larger capacitances than 330uf
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Old 11th December 2006, 09:40 PM   #6
rdf is offline rdf  Canada
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Aren't you dissipating >280 watts in the drop-down resistors? 2.6 amps through 41.5 ohms. Buy heatsinks.
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Old 11th December 2006, 09:56 PM   #7
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I'd use a bridge rectifier, 4,700 mkF cap, and this current limiting voltage stabilizer (12V Zener for 12.6V output, and a resistor in place of current source):

Click the image to open in full size.
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Old 12th December 2006, 06:51 AM   #8
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Ah yes, seems like I didn't think ANYTHING while modeling that thing. Just forget that stupid picture. Thanks all. Back to Jones' books...
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Old 12th December 2006, 07:53 AM   #9
rdf is offline rdf  Canada
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Nothing to get frustrated about, the only reason I saw it was from repetetive and explosive experience releasing the magic smoke from resistors. Now I always keep the solar calc on the bench.
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Old 12th December 2006, 06:58 PM   #10
Sherman is offline Sherman  United States
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I just built a regulated DC filament supply for a hybrid amp I'm working on. Four 1N4007s,1 100uF 25V electrolytic, 1 LM317, 2 resistors (1/2W). Total cost (since I have about 10 LM317s here I got for twelve cents each) about $3.50 US. The perfboard I mounted it on is about 1/3 of the cost.

I'm thinking about making PC boards to use the LM350 per SY's suggestion for amps needing more than 1.5A of heater current. Also it would be easy to use a 12.6VAC source for both 12.6V and 6.3V heaters just by adding one more LM350 (or 317) and two more resistors.
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