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Peter Daniel 26th August 2009 04:34 PM

Universal Power Supply PCB
 
3 Attachment(s)
I'd like to present here a power supply board that can be used in many different ways. It's been offered for quite some time now with various amp group buys, but the application info has never been consistently gathered in one place.

The most recent version consists of 6 small rectifier boards and 3 main supply boards (two positive, one negative), all separated with scoring lines.

A complete board is available at $30, however, normally I separate it into smaller sections. So, I first remove rectifier strip on the right and then, depending on requirement, I either remove top positive supply board, or lower negative supply board.

In this way, I'm having either a symmetrical amp PS pcb (good for F4, F5, AJ-X amps) or dual positive supply (F2, F3). The remaining positive board can be used to supply small power line stages (like Shigaclone), more on that later.

Dual supply boards are avaialble at $20, single supplies at $10. Small rectifier boards are avaialble free of charge, either added to amp board order or separately.

Peter Daniel 26th August 2009 04:38 PM

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The rectifier section accepts high power diodes mounted as in a picture below (they can be attached directly to a chassis for heat dissipation, isolation pads needed). The board is designed mainly for 3 pin rectifiers, but will work with other diodes packages as well. Here's MUR3060:

Peter Daniel 26th August 2009 04:42 PM

2 Attachment(s)
The two pin rectifiers will work too, however, because one of the pins is hanging not connected now, you need to use jumpers between center pad and outer pin. The jumpers install like in a picture below (opposite the white stripes which mark something else). You can also bend the pins and use them as jumpers.

Peter Daniel 26th August 2009 04:47 PM

3 Attachment(s)
The white stripes mark the spots to install rectifiers in TO-220 packages (like MUR860).

Picture below also shows how rectifier board connects to the PS board: use 4 wires for DC, wires from transformer secondaries connect to pads marked A/C (one secondary to one set of diodes, the other to a second set).

In case of TO-220 diodes, their pins can be used as jumpers to connect directly with traces to capacitors.

Peter Daniel 26th August 2009 04:58 PM

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For power amp application, we are only interested with two large caps and 4 resistors (usually 0.47R), the additional small components are not being used here; those are reserved for small power regulators in supplying line stages.

The board will accept up to 50mm capacitors, including caps with screw terminals like those Sikorels below.

Peter Daniel 26th August 2009 05:09 PM

3 Attachment(s)
The board will also accept Jensen 4 pole caps. With those though, to achieve maximum potential, traces below need to be cut as per attached picture.

Peter Daniel 26th August 2009 05:16 PM

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Now, for those who were wondering what are all those additional components for, here's the picture of the regulator circuit with LT1086. Of course this is no good for power amps, but works fine with preamps, active filters etc.

Peter Daniel 26th August 2009 05:31 PM

1 Attachment(s)
Attached picture shows it for LM317 (top) and LM337 (bottom), the orientation and placement of TO-220 regulators is critical as the supply boards work with symetrical voltages.

The other parts values are according to schematic in a picture:

R1/R3 = 120R
R2/R4: adjustable 2K, can be later replaced with a fixed value
C1-C4 = 0.1uF (optional, any other small value should work fine too))
C5/C6 = 10uF

Choose any suitable values for large caps. Although grounds are shown as common in a schematic (courtesy of National Semi), they are kept separately on my boards.

That arrangement is also good for LT1086/LT1033.

The other two spots are reserved for LM78xx/LM79xx

Peter Daniel 26th August 2009 05:33 PM

3 Attachment(s)
Here's a charger (based on LM317) for battery supply with my Fertin drivers. The output cap is BG N 10/50, small caps not used.

Also, powering CD Player.

samoloko 25th September 2009 09:39 AM

Hi Peter

what are preferred caps when using pcbs as PS for Power Amps - Jensen ?
would you please post schematic of charger using this pcb


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