B1 Power Supply Options

rgheck · 19th October 2009, 10:29 PM

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.

R-K Rønningstad · 19th October 2009, 10:37 PM

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

R-K Rønningstad · 19th October 2009, 10:40 PM

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.

dubai2000 · 09:21 PM

That looks smart - thanks a lot for the info

.

dubai2000 · 21st October 2009, 11:24 PM

Perhaps a stupid question, but how does one determine the value of the resistor needed to replace the trim pot?

DougL · 21st October 2009, 11:35 PM

Quote:

Originally Posted by dubai2000

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.

R-K Rønningstad · 22nd October 2009, 04:40 AM

You calculate it

Vout = 1.25 * (1 + Rlower/Rupper)

see http://www.national.com/ds/LM/LM317.pdf

thanh1973 · 22nd October 2009, 06:05 AM

My vote goes with the Salas Reg. You won't be disappointed.

The simplistic Salas low voltage shunt regulator

R-K Rønningstad · 22nd October 2009, 02:58 PM

Probably better, but this one is cheap and a good starting point.

sandbasser · 03:46 PM

Has anybody tried a Tread (from Tangent)??? It may be a bit overkill.

19th October 2009, 10:29 PM	#1
rgheck diyAudio Member Join Date: Aug 2003 Location: Canton MA	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.

21st October 2009, 08:52 PM	#4
dubai2000 diyAudio Member Join Date: Apr 2008	That looks smart - thanks a lot for the info . Last edited by dubai2000; 21st October 2009 at 09:21 PM.

22nd October 2009, 06:05 AM	#8
thanh1973 diyAudio Member Join Date: Nov 2006 Location: Melbourne	My vote goes with the Salas Reg. You won't be disappointed. The simplistic Salas low voltage shunt regulator __________________ "an amp so simple, even a cave man could build it"

22nd October 2009, 03:41 PM	#10
sandbasser Fanatic diyAudio Member Join Date: Sep 2008	Has anybody tried a Tread (from Tangent)??? It may be a bit overkill. __________________ - Ray Last edited by sandbasser; 22nd October 2009 at 03:46 PM. Reason: spellcheck

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21st October 2009, 11:24 PM	#5
dubai2000 diyAudio Member Join Date: Apr 2008	Perhaps a stupid question, but how does one determine the value of the resistor needed to replace the trim pot?

22nd October 2009, 04:40 AM	#7
R-K Rønningstad diyAudio Member Join Date: Jan 2006 Location: Oslo	You calculate it Vout = 1.25 * (1 + Rlower/Rupper) see http://www.national.com/ds/LM/LM317.pdf

22nd October 2009, 02:58 PM	#9
R-K Rønningstad diyAudio Member Join Date: Jan 2006 Location: Oslo	Probably better, but this one is cheap and a good starting point.

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