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 Forum index » DIY Hardware and Software
1st time PSU builder need advice.
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Wild Zebra



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PostPosted: Fri Jan 06, 2006 8:51 am    Post subject: 1st time PSU builder need advice. Reply with quote  Mark this post and the followings unread

Howdy all, I'm about to have a few modules and am going to start my very first modular. Razz So I need a PSU figure I'll make this one http://www.musicfromouterspace.com/analogsynth/powersupply.html So what does a first timer need to know. How many modules will it accomadate?, What sort of adapters can I use to plug them up? Whats the best way not to electricute myself? I'm no stranger to DIY just haven't made a PSU yet. So, any help would be great.
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Pehr



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PostPosted: Fri Jan 06, 2006 9:38 am    Post subject: Reply with quote  Mark this post and the followings unread

I've built that PSU and it works perfect. Just use a transformer like the one shown in this topic. I choose a 500 mA transformer but there are those that can produce up to 2000 mA or more. More mA = more modules Very Happy
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deknow



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PostPosted: Fri Jan 06, 2006 10:18 am    Post subject: Reply with quote  Mark this post and the followings unread

...that looks like a good design..simple, low parts count, etc.

i built one for the paia vocoder several years ago using the schematic supplied in radio shack books (radio shack is like malpin, but in the states). since radio shack sells parts, this design used 2 separate transformers....1 is preferable.


you can also use discrete diodes rather than in integrated bridge rectifier if they are more easily available.

deknow
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Wild Zebra



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PostPosted: Fri Jan 06, 2006 10:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I choose a 500 mA transformer but there are those that can produce up to 2000 mA or more
So how will I know how many modules I can use. And is there a "patch bay" for lack of better words, that I can have offboard to plug the modules into. Like a male\female setup.
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Pehr



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PostPosted: Fri Jan 06, 2006 10:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Wild Zebra wrote:
So how will I know how many modules I can use.


That's tricky, you have to know how much current each module draws... Confused

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Wild Zebra



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PostPosted: Fri Jan 06, 2006 11:34 am    Post subject: Reply with quote  Mark this post and the followings unread

otay, I haven't even got the modules yet. So when I get a little closer I'll ask a few more questions. Just kind of wanted a heads up. I may be p.m.'n you in the not so distant future Pehr. I'm making the 16 step seq too so I may need some more advice.

thanks for the help so far

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Uncle Krunkus
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PostPosted: Fri Jan 06, 2006 7:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey Zeb,
If you can afford the transformer (go torroidal if possible) I'd recommend 1A on each rail (+&-). That should be fine for quite a while. Use some type of universal edge type power connector on each module, and as you build them, check what they draw (mA) then write this next to the power connector for that module. When you get to about 80% of your supply's capacity, start building another PSU.

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Pehr



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PostPosted: Sat Jan 07, 2006 7:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Wild Zebra wrote:
I may be p.m.'n you in the not so distant future Pehr. I'm making the 16 step seq too so I may need some more advice.


0k, but I haven't started building it yet... Embarassed but I'll start soon. I have had much to do lately...

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Uncle Krunkus
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PostPosted: Sat Jan 07, 2006 7:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Are you guys talking about the sequencer on Ray's site?
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Pehr



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PostPosted: Sat Jan 07, 2006 4:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
Are you guys talking about the sequencer on Ray's site?


I think so Rolling Eyes

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Uncle Krunkus
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PostPosted: Sat Jan 07, 2006 6:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

Do we want a stripboard layout of that?
I could make it the third choice in my poll.
Instead of just "some 4017 sequencer"

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Pehr



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PostPosted: Sun Jan 08, 2006 6:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
Do we want a stripboard layout of that?
I could make it the third choice in my poll.
Instead of just "some 4017 sequencer"


That would be great! Very Happy

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Uncle Krunkus
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PostPosted: Sun Jan 08, 2006 9:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's another fine mess I've gotten myself into Stanley! Laughing
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Wild Zebra



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PostPosted: Mon Jan 09, 2006 7:40 am    Post subject: Reply with quote  Mark this post and the followings unread

I already bought the boards when the were on sale. I'll need a supply for that, but I need one for some of Ray's modules I'm getting. A while back I was contacted by a feller who had made some of Rays modules and wanted to know if I wanted to buy them. I recently did. Figured I'd be a nice jump start into a modular type thing. I got LP VCF, Multiwave LFO, Signal to Gate, State Variable VCF, and S&H with White noise. So never having seperate modules and never building a PSU figured I'd ask. Now I ask should I buy or build? If buy, any recommendations.
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Uncle Krunkus
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PostPosted: Mon Jan 09, 2006 8:23 am    Post subject: Reply with quote  Mark this post and the followings unread

I would build it, mostly 'cos I've already got a lot of the parts for that kind of stuff. (I stocked up before I left Jaycar)
Like I said at the top go for 1-2A per rail. Use 4 pin connectors for each module and make one of the pins a Digital (or dirty) ground. It'll come in handy later, believe me.
I'd probably base it on the one Ray's got on his site.

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Wild Zebra



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PostPosted: Mon Jan 09, 2006 10:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Like I said at the top go for 1-2A per rail. Use 4 pin connectors for each module and make one of the pins a Digital (or dirty) ground.

Ahhh what? Sorry I'm still kind of an idiot when it comes to this stuff although I have been successful building some things> I don't understand alot of what I'm doing. I'm still way off on needing the supply. My modules have not arrived yet. So I got a little time to figure it out.. Thanks for all the help so far

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Uncle Krunkus
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PostPosted: Mon Jan 09, 2006 5:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's cool,
I'm still learning about "preload" on sequencers to create random steps!!
Just take a look at Ray's PSUs, and give me a holler when you want something cleared up.

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