LED for LFO speed - Small Stone

[kismet78]

Glad you worked it out 

I doubt you will be loading the LFO by any detectable amount - similar LFOs in modular synths may successfully run heaps of other stuff, let alone one extra LED.

Great, that's exactly what I wanted to hear.

And I think I'm going to go with the smooth wave pulse. It really does look good. Nice and gentle throbbing, not jarring or attention grabbing like a hard on/off.

[kismet78]

Thanks for everyone's help with the finishing touch on my rehouse. Here's a shot I took this morning. There's more pictures and descriptions here: kyletompkins.com. Let me know if I've forgotten to credit anyone.

[frequencycentral]

Thanks for everyone's help with the finishing touch on my rehouse. Here's a shot I took this morning. There's more pictures and descriptions here: kyletompkins.com. Let me know if I've forgotten to credit anyone.

Hey! Amazing looking pedal - and I bet it sounds killer too.

Thanks for the credit, though I don't feel i did much to help. I get so much from this forum - its always great to give something back.

Rick

EDIT: ...and why haven't you posted it in the 'Pictures!' thread - tut tut!

[fuzzo]

Hi,

someone can say me where connect the LED to have a "flashing speed LED" ?  Which IC ?

[kismet78]

Try tapping the LFO off of one of the legs of R30 or R40.

[fuzzo]

Ok i'll try that today.

But how  I connect the LED  ?  The other Led's lug goes to ground or V+( with a restitor) ?

R30 or R40--LED ( lug -)--- LED (lug+)---R---V+ ?

Like that or something else ?

[frequencycentral]

R30 or R40  >  resistor (try 4K7)  >  LED  >  ground

[fuzzo]

thanks I try that.

[fuzzo]

I found a great point to do the flashing led.

Led+-- base of Q3
LED- R21

I"ll test the sound , to see if there's a probleme with this stuff and I take pics.

But now when the switch color is up the sound becomes crazy and a kind of horrible larsen "ouinnnouinnnnn", grrrrrrr.

[Unlikekurt]

I realize I'm super late to the party on this one, but I have an observation/question.

This works really really really well when the color mode is engaged, the LED goes from bright to off (or just about so) wherever the rate pot is, up to full flicker at vibrato.  However, when color mode is not engaged the led pulse goes from noticeable when the rate is super slow to barely even noticeable when the pot is around say 3:00.

Anybody's help on this would  be greatly appreciated; that includes contrary observations or any recommendations.
Thanks
James

[chromesphere]

Good idea!  Never thought of doing this...im going to try it.

Unlikekurt, ill let you know if you i have the same problem with dry mode not flickering properly.

CS

[chromesphere]

Yeah, had the same problem here.  LED straight to ground (adding a resistor of any size makes the LED too dim so left it out) from pin 2 of IC5 produced good results for wet mode, very usable. 

In dry mode with a fast speed, the pulsating was ok.  But turning the frequency down resulted in a bearly visable pulse.

Even though it would be nice, I'm thinking I might just give up on this one...

Anyone here have any other suggestions or ideas?

(thanks)

CS

[Cyeos]

I'm going to try a rate LED tonight probably, but I'm guessing I'm going to have the same problems with low brightness in dry mode.

Maybe use a super-bright blue or white LED to compensate?  The white and blue 5mm LEDs I have are many times brighter than green or red equivalents.

Maybe you could go overboard and put the LED output through multiple gain stages to make the pulsing a square wave and run that into a CMOS 4093 buffer stage or something like that.
(Maybe I should just say "buffer" since I don't know what I'm talking about)

Of course then that would make it on/off not "pulse"....d'oh!