1590G multi

[dannoceti]

I'm thinking about doing my first multi using the 1590G boards.

How many circuits can be powered off one onespot?

Any reason for concern, or just load up with as many as I want?

[culturejam]

For most analog circuits, the draw is pretty low. Dirt circuits are usually the lowest current draw. Delay is the highest.

But, more to the point, on a OneSpot, all the connections are running off the same power supply (internally). The taps are not isolated. So as long as your multi-build current draw + the rest of your board doesn't exceed the max current output of the OneSpot, you're good.

However, if you have one of the newer fancy isolated-tap OneSpot Pros, then you have to know the current output of the tap you want to use. But I believe it is marked on the case. 100mA is enough to run a slew of dirt boxes, or a couple dirts and some modulation. 300mA would be good enough for a full-fledged digital delay and most anything else.

I draw of a PT2399 is about 30mA on average, just for reference. 

[madbean]

All of them, no joke. Did it in my demo on youTube.

[dannoceti]

Awesome, thank you both for the quick responses.

In the future how would I determine the current draw of a circuit? Is that typically in a build doc? Or something I can measure with a multimeter when I test it?


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[Willybomb]

I'm not sure what he's using to power this but it has a single 9v jack...

http://www.madbeanpedals.com/forum/index.php?topic=22767.15

[davent]

Awesome, thank you both for the quick responses.

In the future how would I determine the current draw of a circuit? Is that typically in a build doc? Or something I can measure with a multimeter when I test it?


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Easy to measure with your multimeter when you test it. Put a 1 ohm resistor in series with one of the power rails between your battery and the circuit, measure the mV drop across the resistor. The voltage drop across the 1 ohm resistor is the current draw.

dave

[gordo]

I'm glad I read this thread because if it detailed somebody doing a multifx build IN a 1590G I was going to switch hobbies to knitting or pottery or something safe.

I took Bean's lead and after building all of the projects I daisychained them onto a One Spot.  Very quiet and the power supply didn't come close to breaking a sweat.

[Droogie]

I put all of mine in one box plus a buffer. No problem whatsoever!