Test bench power supply

[slanwar]

Found this power supply article on nuts and volts from march 2007 and I would like to build one:


I'm having a bit of an issue to find some parts like the transformers, I was looking to find exactly the same parts.

 

[BobK]

It would help if you told us what the parts were, or at least linked to the article.

Bob

 

[slanwar]

 

[Arouse1973]

Hello, I can't see the image, just a box with a cross in it?
Thanks
Adam

 

[slanwar]

Trying to get the picture, my iPad is not helping

 

[slanwar]

PARTS LIST

0-20 VOLT BOARDS DESCRIPTION

❑T1 120V primary, dual 44V center tap secondaries @ 1.5A

❑ D1,2 3A, 100 PIV

❑ D3,4,5,6 1N4002

❑ C1 4700 ìF/35V *

❑ C2 100 ìF/35V *

❑ C3 0.22 ìF

❑ C4 10 ìF/35V

❑ C5 22 ìF/35V

❑ C6 0.1 ìF

❑ R1 0.1Ù 1% 3W

❑ R2 16Ù

❑ R3 750K

❑ R4 2.7K

❑ R5 12K *

❑ R6 240Ù 1%

❑ R7 100K

❑ R8 910Ù

❑ P1 500Ù

❑ P2 5K

❑ P3 200K

❑ P4 200Ù (Mouser #531-PT10V-200; $0.42)

❑ Z1 1.25 volts reference (Mouser #511-TS821A1Z; $0.64)

❑ IC1 LM317K (Mouser #511-LM317K; $2.10)

FIVE VOLT SUPPLIES BOARD

❑T2 120V primary, 9V secondary@ 1.5A

❑T3,T4 120V primary, dual 9V@ 65 mA secondaries

❑ C1 4700 ìF/16V

❑ C2 10 ìF/16V

❑ C3,5,7,9,11 0.1 ìF

❑ C4,6,8,10 47 ìF/16V

❑ BR1 2A, 100 PIV

❑ D1,2,3,4 1N4002

❑ IC5 7805

❑ IC1,2,3,4 78L05

MISCELLANEOUS

❑ S1 SPST toggle switch

❑ S2 4PST toggle switch

❑ Panel Meters 200.0 mV

 

[slanwar]

The first one on the list I have a hard time to find one with the exact same specs
"T1 120V primary, dual 44V center tap secondaries @ 1.5A"

 

[Arouse1973]

If you can find one with a larger current rating that will be fine. Is this the problem your having.
Adam

 

[BobK]

If you do find such a transformer, it will probably cost you more than buying a complete bench power supply.

Bob

 

[BobK]

Actually I looked, and dual supplies do not come that cheap.

I think your best bet would be to get a toroid core of the appropriate size and wind your own transformer.

Bob

 

[slanwar]

I found a few Chinese power supplies on eBay rating 30v for $33 free shipping ---from China or they are really bad or they are really cheap

 

[BobK]

Yes, I found cheap singles, but no duals for less than about $180.

Bob

 

[slanwar]

Actually I looked, and dual supplies do not come that cheap.

I think your best bet would be to get a toroid core of the appropriate size and wind your own transformer.

Bob

When I was a teenager I used to build my own transformers, good times, everything electronic was expensive so we had to improvise.

 

[Colin Mitchell]

How many times in 20 years will you need a DUAL supply?

 

[davenn]

for me, often

 

[slanwar]

I end up to buy one on Ebay for $80, says "made in USA" but I have to see to believe.

 

[BobK]

One what? Transformer or dual supply?

Bob

 

[slanwar]

One what? Transformer or dual supply?

Bob

http://www.ebay.com/itm/120832358839?_trksid=p2059210.m2749.l2649&ssPageName=STRK:MEBIDX:IT

 

[BobK]

Okay, that would be a single supply.

Bob

 

[slanwar]

Okay, that would be a single supply.

Bob

And I was reading the description and nothing there saying is made in USA just the warranty and service.