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Old 19th August 2004, 08:40 PM   #1
ble0t is offline ble0t  United States
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Default Dual 15V Regulated Supply

Just wanted to have the forum take a look at this to make sure I didn't goof anything up. It's a basic, regulated power supply for some things I'll be working on. Thanks in advance!

All Diodes = 1N4004
C2 - C5 = 1000uF 35V
C6 - C13 = 20uF 35V Tantalum
R1,R2,R5,R6 = 240
R3,R4,R7,R8 = 2.7k
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Old 19th August 2004, 09:09 PM   #2
moamps is offline moamps  Croatia
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Hi,

D8 and D12 have wrong polarity.

(In SCH CAD choose rotation elements without text rotation )

Regards
Milan
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Old 19th August 2004, 10:32 PM   #3
ble0t is offline ble0t  United States
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Ahh..yes...thanks. That's what I get for cutting and pasting
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Old 28th August 2004, 12:24 AM   #4
ble0t is offline ble0t  United States
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Well, I've made some pretty substantial changes to my layout, as well as switched to Eagle (wow, what a difference). Just wanted to have people take a peak and see if they notice anything glaringly wrong with my schematic/board layout.

Thanks
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Old 28th August 2004, 02:05 AM   #5
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Default Re: Dual 15V Regulated Supply

Quote:
Originally posted by ble0t
Just wanted to have the forum take a look at this to make sure I didn't goof anything up. It's a basic, regulated power supply for some things I'll be working on. Thanks in advance!

All Diodes = 1N4004
C2 - C5 = 1000uF 35V
C6 - C13 = 20uF 35V Tantalum
R1,R2,R5,R6 = 240
R3,R4,R7,R8 = 2.7k

why make when you can buy a dual 15V Lambda supply for under $20 bucks on EBay. Search under Business/Test Equipment/Power Supplies
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Old 28th August 2004, 08:39 AM   #6
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Default Can we just buy one?

HI,
Do you guys know where to buy power supply PCB in USA?
I am looking for a bare pcb with two positive voltage output.
Thanks,
CC
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Old 28th August 2004, 05:34 PM   #7
ble0t is offline ble0t  United States
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Well, it's not a dual supply anymore, and I should have labeled the ICs better in the new version. It has an LM7805 for a 5V output and also has an LM2940 for 12V output (for some 12V relays).

Besides, where's the fun in buying it?
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Old 1st September 2004, 01:28 AM   #8
drdagor is offline drdagor  United States
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Default High frequency bipass capacitors?

You can get "motorboating" (pulsing output). It's probably a good idea to put smaller capacitors right at the regulators and in parallel with the large tant's. These should be good ceramics -- I like .022 or .047 although the common value is .1.

The National LM117 datasheet has a good discussion of why they are needed and where to put them.
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