How much current

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

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

Scott Stites · Posted: Thu Feb 16, 2006 3:57 pm Post subject:

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

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

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 · Posted: Sat Feb 18, 2006 4:27 am Post subject:

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

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

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

mosc · Posted: Sat Feb 18, 2006 2:04 pm Post subject:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

speaking of bubbles, cheers... Very Happy

Uncle Krunkus · Posted: Sat Feb 18, 2006 3:20 pm Post subject:

Cool,
Sorry for sounding so remedial Wink

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

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