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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
LEDs modification: there's a problem
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vintage



Joined: Mar 21, 2005
Posts: 8
Location: spain

PostPosted: Mon Apr 04, 2005 12:42 am    Post subject: LEDs modification: there's a problem Reply with quote  Mark this post and the followings unread

I added three LEDs to my SL, one for LFO (pulsating), one for the AR-Gen, and another one for the power one.
The problem is: the LEDs eat current when they're ON, and when they are, the rest of the SL gets a slightly less voltage, so the pitch in the LFOs goes down.
Of course the power ON LED is always ON, so you don't notice with it, but you do with the LFO and AR-Gen.

Any solutions?

Thanks!
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mosc
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Joined: Jan 31, 2003
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PostPosted: Mon Apr 04, 2005 7:33 am    Post subject: Reply with quote  Mark this post and the followings unread

This is a classic engineering problem. You can try to limit the current the LEDs draw by increasing the series resistor. You can also isolate them with buffer amps which are connected to a seprarate power supply. That would be my choice.
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vintage



Joined: Mar 21, 2005
Posts: 8
Location: spain

PostPosted: Mon Apr 18, 2005 12:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Fixed the problem.
Just change the 1k resistors form LED to ground with 3k3 resistors.
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mosc
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PostPosted: Mon Apr 18, 2005 4:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Good. Glad to hear it. You can keep increasing the size until the LEDs are too dim.
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blue hell
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PostPosted: Mon Apr 18, 2005 5:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

I was thinking that mabe the power supply is underrated, or that the wiring plan is not quite what it should be. A few mAmps for some leds should not make an LFO go change speed.

Ah well, probably just old fashioned enginering ideals, to want to find the real cause of the problem .. and whatever it is, its not the leds :-)

Jan.
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