Simple Tremolo

[GREEN FUZ]

Maybe it`s the LDR but where is it going?

[foxfire]

my guess is that it is a passive trem much like darren's optical trem. so the led/ldr combo shorts the signal to ground. the main problem i had with darren's trem was that it was too quiet without some sort of boost in front of it.

[dxm1]

Well, if R4 was the "R" of the LDR, and if the bottom leads of R3/C3 were moved down a strip, it would make more sense...

[newfish]

Zut Alors!

Me and my crazy late night brain.

R3 and C3 *should* go one strip lower - thus feeding the Anode of the LED.

* oops *

[12milluz]

Never used a LDR before, but uh whats the value of the one needed?

[nokaster]

the value of R4 would interest me as well!

[newfish]

Ah, right.

*finally* got online to make some corrections.

R3 and C3 have now been moved down to their proper position - supplying juice to the LED (shown as D2).

Wasn't sure what the layout symbol for an LDR was, so I've used the standard Resistor symbol - labelled R4.

I'll get a schematic drawn up - then it *should* make a little more sense.

We've had family visiting for a few days, so I've not really had chance to do circuit-style things.

[newfish]

...as stated, here's the Schematic.

Hopefully it should make a little more sense.   

http://www.iansnape.co.uk/images/Tremolo_Schematic.png

[12milluz]

What's the value of the LDR I'm confused.

[newfish]

To be honest, I used an LDR I had lying around.

There are no markings on it as far as I can see - it's just a simple circular 'solar panel' roughly 1/4 of an inch diameter (6mm or so).

If you've got LDRs with markings / specified values, I'd say 250K or so.

Will post a photo later on.

[newfish]

...and here they are...

http://www.iansnape.co.uk/images/LDR_Face.JPG

http://www.iansnape.co.uk/images/LDR_Profile.JPG

Second one slightly out of focus, as my Camera won;t zoom in that far (even on Macro).

Hope this helps.

Checked again - and there really are no markings on these components.

[12milluz]

Thanks! I'll just find a couple values and try it. I can't wait to make one of these.

[Mann]

Did anyone make this one?

[newfish]

This has been a slow burner - but I've got there.

I've substituted the LED / LDR combination for a 4-pin opto-isolator - with excellent results.

The effect used to be very subtle - but is now a full square wave on / off effect - without the ticking that was previously creeping in.

Will be adding a 'blend' of some sort to give a softer option, but for now it's a very 'How Soon Is Now?' kind of sound.

Updated layout will happen shortly too.

[12milluz]

Good Good, still haven't gotten around to experimenting with it but am eagerly awaiting its finished design!