| 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 |
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| moamps |
Hi,
D8 and D12 have wrong polarity.
(In SCH CAD choose rotation elements without text rotation :))
Regards
Milan |
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| ble0t |
| Ahh..yes...thanks. That's what I get for cutting and pasting ;) |
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| ble0t |
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 :D |
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| jackinnj |
| 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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| contaxchen |
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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| ble0t |
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? :D |
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| drdagor |
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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