'LIGHTWAH'

deadastronaut · March 18, 2011, 01:23:24 PM

@arnoud: had a look at ricks 'little angel'

i take it the lfo section is just the bottom left quater of the schematic...and just any op amp tlo72 yes?..

gnognofasciani · March 18, 2011, 01:34:02 PM

Why don't you first try to breadboard the 555 lfo using it externally?Maybe the ticking depends on the layout

Hides-His-Eyes · March 18, 2011, 05:00:37 PM

You can get a decent square wave with 1 op-amp, and a decent triangle with 2. A decent sine wave takes a whole 4049.

~arph · March 19, 2011, 06:41:15 AM

You can get a decent sine with two opamps too.. let me try and digg that schematic up for you, I have been using that LFO for years..

deadastronaut · March 19, 2011, 06:46:06 AM

Quote from: ~arph on March 19, 2011, 06:41:15 AM
You can get a decent sine with two opamps too.. let me try and digg that schematic up for you, I have been using that LFO for years..

cool, nice one arnoud...

Quote from: gnognofasciani on March 18, 2011, 01:34:02 PM
Why don't you first try to breadboard the 555 lfo using it externally?Maybe the ticking depends on the layout

yep i think it may be down to proximity of parts....i'll build the 555 seperately and the wah and see how that goes..

just a thought, maybe if we seperate the signal/power grounds?...hmmm...

@hides: ive tried a few lfo's and a lot of them tick, it def needs a sine wave though for the sweep...thats why i went with the led fader circuit....

edit:ill wait to see what arnoud has...cheers guys.

~arph · March 19, 2011, 06:53:55 AM

It's on my other computer, will probably post it later this day.. Now I'm having lunch

deadastronaut · March 19, 2011, 06:55:58 AM

Quote from: ~arph on March 19, 2011, 06:53:55 AM
It's on my other computer, will probably post it later this day.. Now I'm having lunch

ok cheers man, enjoy your lunch...

deadastronaut · March 23, 2011, 07:12:01 AM

@arnoud. that was a big lunch..

did you find that sine lfo...?

also i was wondering how it would be wired to the wah though!...looks a bit confusing to a dumbass like me..

i looked at the phozer by runoffgroove, its similar to what i was up to, but doesnt seem to wah as much.......

and still uses opto's..which i'm trying to get away from...

~arph · March 23, 2011, 07:40:20 AM

Oh yeah man I'm still full..

Let me make it up to you:

The non-decoupled Vref is important!! if you decouple it, it might not work.

One led is for the LDR the other a speed indicator. I used clear lense high intensity ones. (green)

deadastronaut · March 23, 2011, 07:43:48 AM

cheers arnoud...i was just looking at this one, i have lots of 741's...is this any good too..?

i havent a 358 at the moment....might get a couple today at craplins..if they have em..

http://www.google.co.uk/imgres?imgurl=http://ecelab.com/circuit-sine-wave-gen.jpg&imgrefurl=http://ecelab.com/circuit-sine-wave-gen.htm&usg=__-dIU84NALC83-BzCwQkYqq8J16Q=&h=370&w=350&sz=16&hl=en&start=4&zoom=1&um=1&itbs=1&tbnid=y_8Qu62XKKdfdM:&tbnh=122&tbnw=115&prev=/images%3Fq%3Dusing%2Ban%2Bop%2Bamp%2Bas%2Ba%2Bsine%2Bwave%26um%3D1%26hl%3Den%26tbs%3Disch:1&ei=9NuJTb2XENSZhQeXxc2eDw

edit:aha..craplins do em...

deadastronaut · March 23, 2011, 07:55:30 AM

ahhhh.. i'm trying to get a sine wave without using led/ldrs though!...

~arph · March 23, 2011, 08:03:48 AM

It is a sinewave without the leds too... you just need to buffer the signal with a transistor and then couple it to the circuit. It's a bit tricky though setting up a transistor as a variable resistor to ground.

You might want to investigate in using a PWM controller, see here:

http://www.diystompboxes.com/smfforum/index.php?topic=90416.0

And then sub the LFO part for mine..

Oh, and the oscillator you posted does not have a variable output frequency.. so no good. I do think you can sub the LM358 for two 741's it's just that the LM358 is a very good opamp for lfo's

Regards,

Arnoud

deadastronaut · March 23, 2011, 08:08:16 AM

ahh i see.

will your lfo be quieter than the 555 version i did..with led/ldr.? i'm sure thats the culprit for the ticking..

i take it those caps are 220nf...

i'll get a couple of lm358n's today...try it later ok..cheers man!...

~arph · March 23, 2011, 08:30:45 AM

Yes I expect it to be dead quiet..

deadastronaut · March 23, 2011, 08:35:08 AM

cool,. thanks for your help man...appreciate it a lot...

i'll try it later on...and post results...cheers. rob.

~arph · March 23, 2011, 08:44:24 AM

I still have to post my version. I want to build one first to be sure it is fine. Time is my enemy

deadastronaut · March 23, 2011, 08:46:32 AM

Quote from: ~arph on March 23, 2011, 08:44:24 AM
I still have to post my version. I want to build one first to be sure it is fine. Time is my enemy

yeah yours sounded an excellent idea...looking forward to it...

i know what you mean about time....life gets in the way ironically..

ppaappoo · March 23, 2011, 09:44:00 PM

hi, long time ago i started to make something similar to you idea.

someday I'll finish, i hope it's helpful to you.

deadastronaut · March 23, 2011, 09:52:52 PM

cool. nice one ppappoo....looks good, youve got to finish that....did you ever get it going and hear it?..was there any ticking?..

@arnoud, just got your lfo working...nice..

i suspect if i want it slower to change cap values...i'll tinker with it. thanks man...(craplins only had 1 ic...

..they live up to their nickname)...

ppaappoo · March 23, 2011, 10:33:38 PM

no, it's only theory!! jajaj. i have the pcb too but for now I will not do it.

as you go with the sine wave generator?, I need one to inject a sine signal at the little angel chorus and make more "modulating"

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