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Old 19th October 2009, 10:29 PM   #1
rgheck is offline rgheck  United States
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Default B1 Power Supply Options

I've built a B1, with which I am very happy, and it is currently running off two 9V batteries. But now I'm considering experimenting with some other power supplies, in particular, a regulated supply. I just happen to have an unused Hammond 182K30 sitting around, which gives 30V off both windings. Would it be possible to put this into some circuit to get what the B1 needs (18V) out of it? If so, could anyone point me at where I might find such info? If that's too big a transformer, can someone point me at a good design for a simple PS for the B1? I saw one thread on this, but it looked as if the person was having rather a lot of problems.
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Old 19th October 2009, 10:37 PM   #2
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I bugh the nice and small Velleman K1823 for my B1. It has a LM317, rectifier diodes, and a cap. And a pot to adjust the output voltage.
I replaced the standard 1N4004 (or whatever it was) with some better ones. It only has 1000 uF, but the B1 itself has some capacity, and you can always add some external bulk as well.
At least it is a USD10 or so starting point.

Rolv-karsten
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Old 19th October 2009, 10:40 PM   #3
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BTW my Velleman with the same order number looked different, like attached here. No sweat anyway....
You can always replace the trim pot with a fixed resistor also.
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Old 21st October 2009, 08:52 PM   #4
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That looks smart - thanks a lot for the info .

Last edited by dubai2000; 21st October 2009 at 09:21 PM.
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Old 21st October 2009, 11:24 PM   #5
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Perhaps a stupid question, but how does one determine the value of the resistor needed to replace the trim pot?
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Old 21st October 2009, 11:35 PM   #6
DougL is offline DougL  United States
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Quote:
Originally Posted by dubai2000 View Post
Perhaps a stupid question, but how does one determine the value of the resistor needed to replace the trim pot?
Remove the pot and measure it.
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Old 22nd October 2009, 04:40 AM   #7
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You calculate it

Vout = 1.25 * (1 + Rlower/Rupper)

see http://www.national.com/ds/LM/LM317.pdf
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Old 22nd October 2009, 06:05 AM   #8
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My vote goes with the Salas Reg. You won't be disappointed.

The simplistic Salas low voltage shunt regulator
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Old 22nd October 2009, 02:58 PM   #9
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Probably better, but this one is cheap and a good starting point.
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Old 22nd October 2009, 03:41 PM   #10
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Has anybody tried a Tread (from Tangent)??? It may be a bit overkill.
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