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Old 16th March 2006, 05:20 PM   #1
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Default Scalable PSU/regulator GB

This came out of the active filter board group buy - with nearly 500 boards sold, what are we going to use to power them? I started a design here, and Jens is tweaking it.

The basic concept is a "universal" positive and negative supply capable of several hundred mA output with:

discrete rectifiers - either 1n4007 types or TO-220 high speed

CRC filter

Discrete regulator with plenty of heat sinking available.

Rather than use the ubiquitous three pin devices, the board will use discrete components to allow using this board for higher voltages as well as the 12-15 used for op amps.

A low noise precision voltage reference will be used.

We're not looking to duplicate an extreme regulator like the Didden/Jung Super Regulators. We are expecting a reasonably quiet, stable regulator suitable for audio.

Since we now have Jens' design services, what would you like to see incorporated in a multi purpose regulator board? We'd like to keep it within the free Eagle size limit of 80 x 100 mm.
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Old 16th March 2006, 06:50 PM   #2
infinia is offline infinia  United States
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Idea: Place Pass Transistors on one PCB edge to facilitate single external heatsink as well as PCB mounts.
desirable and/or possible?
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Old 16th March 2006, 07:59 PM   #3
kro5998 is offline kro5998  Netherlands
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idea 2

The space for the electrolitics is rather small.I would like to use bigger caps than the ones used (i guess 12-15mm).
You could combine the space for the rectifier diodes.You either want to use standard or TO220 devices.This way you could reserve more space for the electrolitics.
Also wider tracks for the higher current parts.

I very nice layout though.

Kees.
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Old 16th March 2006, 08:21 PM   #4
kro5998 is offline kro5998  Netherlands
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Here's another one.

Has anybody thought about a relais for shorting the outputs during startup/shutdown?
I've heard that these filters will make the strangest noises when shutting down.

A delayed - on and fast - off would be nice.

Kees.
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Old 16th March 2006, 08:54 PM   #5
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Bob,

Here is my take on a PSU for active filters....

Please comment.

\Jens
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Old 16th March 2006, 09:17 PM   #6
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And the silkscreen

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Old 16th March 2006, 09:47 PM   #7
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Finally a 3D model of the board.

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Old 16th March 2006, 10:59 PM   #8
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Wow, and it's not even Friday!

Comments -

The pass devices are not at the edges of the board, but the heat sink provided should enable these boards to handle an amp or more, correct?

Any way to make a spot for LM4040 or similar instead of zeners? - maybe they could share a common pad.

We lost the TO-220 rectifiers. An extra pad at one end of the diodes would allow that without taking up more board space. I know your feelings about them, but the board might have more universal acceptance with them

The bigger main filter caps are good.

Would you explain the purpose of the extra resistor in the tail of the LTP?

Thanks
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Old 17th March 2006, 12:11 AM   #9
kro5998 is offline kro5998  Netherlands
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Bob,Thats exactly what i meant about the space for the diodes.If you provide extra pads for the TO220 devices within the space of the diodes you don't lose extra space and still can use both.
The same goes for the LM4040.One extra pad within the space for the zener will do.You just cut the third leg of the lm4040.

As for the heatsinks, for the purpose it is intended the size should be big enough provided you choose the right transformer.

Say 3 to 5 Volts drop across the output device and a current of 200 to 300 mA max. will give you 1.5 Watt dissipation.The SK104 has a coefficient of 11K/W So at room temperature it should not get hotter then 36-40 K.

Kees.

Jens, what is the diameter of the Buffer caps?
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Old 17th March 2006, 01:34 AM   #10
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Quote:
Originally posted by kro5998
Here's another one.

Has anybody thought about a relais for shorting the outputs during startup/shutdown?
I've heard that these filters will make the strangest noises when shutting down.

A delayed - on and fast - off would be nice.

Kees.
Probably ought to be a separate board, since it will have signal on it. I've been thinking along those lines and that accepts a 12V trigger - I'll work up something tomorrow.
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