tiny tremoloOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

[deadastronaut]

that is 'unverified'  i never got around to building it....build a your own risk.

try a 22k for wah..

and a 4.7k/5k/10k for speed.

[yurumbel]

Thanks man! I hope it works

[monksanto]

Hi, sorry for stupid question, but I can find the 555 chip everywhere but I'm confused about which ones are cmos & which ones are standard etc? Is there a particular part number I should be looking for, such as "TLC555CP", for instance?

[EDIT: Well, I answered my 1st question, anything with a "7" or a "C" in the name is a CMOS chip!]

Also, would this optocoupler be suitable instead of separate red LED/LDR/heatshrink etc?

Thanks.

[duck_arse]

at 99c it couldn't hurt to try it. it is often referred to as a vactrol and has the internals you need.

[monksanto]

Well I snagged them on special, 50 for $20, I guess I'll soon find out if they work in this circuit! 

[duck_arse]

50 you say? looks like you've got lots and lots of modulation experimentation ahead of you.

[Mario44]

Very good idea.
Just build one for testing and got fried 2 leds on it
edit: didn't mean mods, just stock version

[duck_arse]

@mario - if using the circuit above, put a resistor 220R will do, between each of the D1 and D2 led K and ground. this will then provide some current limit if you wind the trimpot all the way. no more blowing leds.

you must always have a current limit resistor for a led, unless it's as a clipper circuit, where the current will be constrained by other factors.

[Mario44]

Yes, finaly I've put any small resistance there and new LEDs after I burned old ones

[Jdansti]

Sorry-I should have thought of that. I think I made VR2 variable to be able to adjust the brightness of the indicator LED, but it really is overkill.  A fixed 1k-4.7k should be fine for VR2.

I haven't burned out the LEDs (yet), but a small resistor in series with VR3 is a good idea. Just make sure you still have enough light to activate LDR1.

[Mario44]

BTW, what type of LDR do you use? Whats their resistance when max and min light is on it?

[Jdansti]

I just used a generic LDR from Tayda like this:
http://www.taydaelectronics.com/catalogsearch/result/?q=LDR

If I remember correctly, the dark reading was around 1M or more and the lighted reading was around 200R-400R. One reason I used an external pot for VR3 was to allow for a little fudge factor in the LED and LDR specs.

I coupled the LED and LDR with black heat shrink tubing.

[jokersmile32]

exclusive to diystompbox...its nice to give something back!...even if its simple

hi guys....been twiddling with bits again..'oh no not again i hear you all cry'!!!!......
heres a very very simple one knob tiny tremolo?. it works great!..and is only 6 components.....thats it!..
i started off wanting to control the speed of a 555 with led..then i thought well why not use an ldr to break the
sound up...here ya go!.....be nice with a chorus /delay....im quite pleased with it...its my first 555 project ever!.
so be kind...
SOUNDCLIP...
http://dl.dropbox.com/u/7464107/tinytrem1.mp3




ive still got it on a tiny breadboard but the above vero will work...going to try a dimming mod too...as well as on and off..
for hard or soft...

 i know there are plenty of tremolo's much better than these out there to build ,but i enjoy the pain and pleasure
of creating!!!!i find it much more rewarding than simply copying....thanks for stopping by..

Where is the Vero layout???

[Kipper4]

Maybe this


https://lh3.googleusercontent.com/proxy/RAwTP0yvI0tqh-zbRALfLBpTIbra9vlMOPD8KxFSbZFRptNNwDGiWXYV6D0UfcLtqCYbFUP-AnL1m-PY9xDjfRq81TkqD5RXaw8wG5JjCL9QMVt2