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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
How much current
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lynes



Joined: Jan 23, 2006
Posts: 29
Location: Everett WA

PostPosted: Wed Feb 15, 2006 11:23 am    Post subject: How much current Reply with quote  Mark this post and the followings unread

Has anyone measured the current draw when the SL is doing its thing. I have built a 9v power supply for my project and want to know if it has enough output capacity.

Cheers

Bill
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Scott Stites
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PostPosted: Thu Feb 16, 2006 3:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ray says that the whole thing draws under 10 mA - not bad for basically an entire synth in a box!

For those of you teetering on the brink of how to power the thing:

http://www.goldmine-elec-products.com/prodinfo.asp?number=G13927&variation=&aitem=4&mitem=22

This wall wart supplies +/- 12V at 100 mA and 5V at 800 mA on a DIN plug. Plenty'o'12V juice to drive the SL, and you've got that 5V for something added (my money is on some PT2399 slice'em dice'em echo modulation add-on's). $2.95 apiece.

I ordered one, got it, but haven't plugged it in. The SL will work fine at 12V, but I'm thinking of regulating to +/-9V for stability.

Cheers,
Scott
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lynes



Joined: Jan 23, 2006
Posts: 29
Location: Everett WA

PostPosted: Fri Feb 17, 2006 11:00 am    Post subject: Reply with quote  Mark this post and the followings unread

I have built myself a tidy little 9V regulated power supply using a 12v transformer and LM317T, Here is the circuit that I used.

Bill


9V power supply.doc
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Uncle Krunkus
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PostPosted: Sat Feb 18, 2006 4:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Sorry to have to burst your bubble Lynes, but I feel obliged to point out that you need a +/-9V supply.
That means there are three connections from the power supply. A 0V rail or ground. A rail which is +9V relative to 0V, and a third rail which is -9V relative to 0V.
Don't hesitate to post back if you need any help getting one sorted out. They aren't very much more complicated. In the meantime go ahead with the Soundlab planning and construction, you can always run it on two 9V batteries till you sort out a PSU. Cool
See ya,
Andrew

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lynes



Joined: Jan 23, 2006
Posts: 29
Location: Everett WA

PostPosted: Sat Feb 18, 2006 9:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Andrew, my bubble is still inflated. I have built two versions on the power supply. One with an LM317T and one with the LM337T. That will give me my +/- 9v.

Cheers

Bill
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mosc
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PostPosted: Sat Feb 18, 2006 2:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Posted Image, might have been reduced in size. Click Image to view fullscreen. speaking of bubbles, cheers... Very Happy
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Uncle Krunkus
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PostPosted: Sat Feb 18, 2006 3:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cool,
Sorry for sounding so remedial Wink

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lynes



Joined: Jan 23, 2006
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PostPosted: Sat Feb 18, 2006 3:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

G'day mate,

No problem, Im just setting up my small drill press to drill some holes in the case for my SL. I'll take some pics and post them when I finish the job.

Bill
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