Tycobrahe Parapedal Vero

alteredsounds · February 09, 2009, 03:02:30 PM

Of course it will work with either value but 68nf is the correct value plus an extra 10nf cap isnt gonna help

daverdave · February 09, 2009, 03:39:45 PM

I'll take out the second 10nf cap and see what happens, still not sure why it isn't working properly, the wiring looks right to me.

daverdave · February 09, 2009, 03:59:25 PM

SUCCESS!!!!
Took out the 2nd 10nf cap and it works!! Sounds awesome so far, not sure whether to put in a 1nf cap like in the schematic or just leave it out, might try it and see, but it works now anyhow. Thanks alot for the help alteredsounds!!

daverdave · February 09, 2009, 04:08:35 PM

So this one works (finally)

Gila_Crisis · February 09, 2009, 04:26:16 PM

wonderfull!!! can you make some sound samples?

daverdave · February 09, 2009, 04:46:07 PM

I don't have it in an enclosure at the minute but I'll try and sort somet out, I need a pot for the vox enclosure I have.
I need to figure out how to put sound samples on here as well

alteredsounds · February 09, 2009, 05:32:16 PM

sweet, well done! on the original theres a .001pf cap i think where you had that 10nf. I know someone said the pot value doesnt matter and they used a dual 100k but I think in the orignal its a much smaller value, I'll desolder and measure it in the morning.

Branimir · February 09, 2009, 05:42:27 PM

Hm...

What about a regular dunlop style wah pot controlling a led that illuminates two light dependant resistors? That way there's no need for dual 10k, the circuit regarding LDR can be tweaked to go from 0 to 10k with not much problems... Also, it could be an another board, that way it would be easy to use the "regular" wah pot... Two blocks, one Parapedal, the other is a ldr circuit that connects to the wah pot...

Anyone having more ideas regarding this? I think there is something similar already on the forums, I remember someone doing mods for scratchy pots with a LDR....?

alteredsounds · February 09, 2009, 05:45:08 PM

I was thinking along the lines of using an ldr setup to get around finding the original type of dual pot, souldnt be too hard i wouldnt think?

clsnacky · February 09, 2009, 05:48:19 PM

Quote from: alteredsounds on February 09, 2009, 03:02:30 PM
Of course it will work with either value but 68nf is the correct value plus an extra 10nf cap isnt gonna help

I'm sorry I wasn't clear in my original post. I have seen another schematic that uses the 47nf in place of the 68nf. Maybe there is more than one "correct" value?

http://wc6w.50webs.com/wc6wvint/pops.html?fr412c.gif

Branimir · February 09, 2009, 05:50:29 PM

I think I found something...

http://geofex.com/Article_Folders/wahpedl/wahped.htm

alteredsounds · February 09, 2009, 06:01:37 PM

Interesting idea, might breadboard that in the morning and have a play.

daverdave · February 09, 2009, 08:13:17 PM

That sounds like an interesting idea, I might have a try at that myself.

Branimir · February 09, 2009, 08:25:04 PM

I reckon those 100k hotpotz/whatever wah pots are much more durable for this kinda application, unlike some 100k dual gang pot that's not that easy to find with such a long shaft... Did I mentioned no scratching?

Also the whole thing could be made along with the parapedal on the same pcb, so swapping out crybaby pcb for parapedal will be simply soldering that 100k to three places on the pcb and the input/out and battery, and there you go - a swap in 10 mins!

daverdave · February 09, 2009, 08:41:37 PM

How would you split the signal from the pot to 2 leds? Could you just take it to 2 seperate circuits or would it need some sort of buffer splitter?

daverdave · February 09, 2009, 08:43:03 PM

Sorry just read your previous post, could just use one led and 2 ldrs.

stobiepole · February 09, 2009, 09:14:12 PM

I was talking to Paul Perry about the Tycobrahe pot problem some months ago, and he suggested using a 13600 OTA to simulate the dual pot. I must chase him up about that...

Chris

daverdave · February 11, 2009, 10:41:04 AM

So would this circuit work to control both filters? The only thing I'm not sure about is that this is a positive ground circuit so would I need a dual power supply or would the pot and led part work with -9v?

eleanor296 · February 15, 2009, 01:28:16 PM

Quote from: daverdave on February 11, 2009, 10:41:04 AM
So would this circuit work to control both filters? The only thing I'm not sure about is that this is a positive ground circuit so would I need a dual power supply or would the pot and led part work with -9v?

Anybody try this yet?
I'd try it, but don't have the parts lying around right now.... sounds like a cool idea.

Andy

Solidhex · February 15, 2009, 02:53:59 PM

Yo

For a while I was trying to adapt Rg's single pot Neovibe speed knob mod to the parapedal http://geofex.com/circuits/ldrlfo.htm I sort of gave up when I couldn't immediately figure out how to implement the dual vactrol as a voltage divider and not just a series resistance. Using a dual vactrol would eliminate the problem of trying to stick 2 LDRS against one led though. There was another site I'll need to track down where someone had shown a way to us the vactrol in a voltage divider but it was so long ago I can't remember where. It would be in one of the threads relating to using a single knob speed control for the Neovibe though.

--Brad

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Tycobrahe Parapedal Vero