i want to try making a new wah..
after modding crybabies and eventually building my own clyde mccoy ( i really like this one)
i figured the transistors do have quite an effect on the tone.
so i want to make a fet-based wah, since fet's generally sound better to me than other Si trannsistors..
any idea on how to alter the good-ol' vox wah circuit to do that..?
there's the schem

Inspired by the info on synchronous rectifiers. If I'm imagining this correctly, the gain ought to go from less than one, up through screamerland, and beyond into comparator/square wave fuzz territory... On second thought maybe that voltage divider ought to go higher than Vref. Some experimenting is needed.

Basically you have voltage control over the antiparallel MOSFET channel resistance.

Hi all

i built a neovibe about 3 yrs ago which never quite went right

I see that RG posted an updated schem and layout on his site.
does anyone know what the amendments were between the earlier published version and rg's update ? - maybe this will help me get mine finished !

TIA
Pete

Already more than a year old and I never saw this page -- it's not in the site's index. Got the links off GaussMarkov's fantastic site.

Hey guys. Im wondering what vactrol to use in the polyphase clone I am building.

I have a bunch of the 5C4/2, but I know some guys use the 5C3/2....

I just wonder how the responce would change? As Im not the most indepth pf these thingies wingies... :oops:

Here's my little christmas contribution.

And a crappy sample:

HERE

Thoughts and suggestions more then welcome.

Happy holidays!

~arph

Inspired by Nigel from Spinal Tap, behold (perhaps) the world's loudest distortion stompbox.

Here's the finished unit:

What I learned:

1. Slamming one 386 into another is certainly over the top, and the two gain controls are fun, but it is still to raw. I think that a buffer at the input leading to a volume control before the first 386 would yield a more useful effect.
2. The output is just too hot for practical use. Drive any other pedal and it will clip the signal. I tried various...

***Unverified!***

I had this idea to take the basic functions of a Tube Screamer gain stage and try and do it all with one transistor.

Don't know if it will work, but it would not take long to breadboard.

Signal goes into emitter (non-inverting input) through a 100k resistor (voltage to current conversion). DC gain is set by 10k collector divided by 1k emitter resistor. Base is biased by negative feedback from the collector, and diode clippers are added for AC signals. Base is then AC...

Simple enough idea, using a CMOS hex inverter chip. U1 is the compressor or expander depending on where VR1 is set. U2 makes up gain and buffers U1.

Not shown are all the other details to make it work: the envelope and LED driver part, and input and output circuitry. But I thought I'd just throw this out there to see what people think. I am thinking of using something like this as the input stage to an auto-wah, to have lots of control over the envelope.

I have an empty dod a/b box case and a fulltone true bypass switch and jacks.

I'd like to build a simple box that doesnt have Leds or anything difficult but all I can find is fulltone's that has all the power supply options.

I'd like to make this my first project if you can point me to an easy to follow picture!

Thanks

Shane

Someone might help to adapt this circuit for stompbox

any idea? :scratch:

Anybody breadboard this yet?

Just haven't found the time to..

the weber revibe sounds incredible. is there a way to replace the tubes with j201s (other other similar) and recreate the vibe circuit in a stomp format (not the reverb portion)? kind of the way we do amp simulators with the j201's. here is the schematic i would assume the only important part is what i have circled but i may be WAY out of line. let me know what you all think. thanks have a good one!

This is silly.

Not picky about transistors, parts values not super critical*, low-ish output impedance, touch sensitive, cleans up with volume knob,
I call it ...but first walk a mile in someone else's bootstrap because it uses the bootstrap technique to wring more gain AND more linearity out of Q1, which seems to push Q2 nicely into overdrive/distortion/fuzz.

Sound sample:

*About the parts values: I got a big box of salvaged parts recently and wanted to make the whole circuit using only recycled...

Hey,
First post here(!). I found this great little circuit for a smooth LED pulse here: (only will need the slimmed down 1 LED version for this pedal).
I used it to make a crude, yet great sounding tremolo effect. I forget exactly what I did because it was a while ago, but I think I placed a resistor between the input and output jacks. Then, I put an LDR from the input to the ground. The LDR is connected to the LED in the pulse circuit (DIY vactrol). I'm a noob, but I'm guessing the value of...

Japanese site :

Regards
box

apologies in advance if this has been brought up elsewhere, but would it be worthwhile to build a combination super hard-on / fuzz factory pedal with a few extra modifications? is the idea doomed to malfunction? is having them in two different enclosures just as effective? i probably only want to do it so i can call it the boner factory . :lol:

hi every one , as I know there's some some electronic pro here, I guess you can help me.

What's the particularity of this kind of circuit (even I've seen the two transitors),

the same schema is used in the univox superfuzz and its son the zvex octane 2

how it works ? What's the impact of the produced sound ?

thx

-devastator-

So I have a pedal (proximity controlled filter) that contains an oscillator which varies in frequency from about 80kHz down to 30kHz.
I also want to include a step-up switching power supply so I can get more power to the antenna and boost its range.

I'm thinking the oscillator I'll need to use for the power supply should be extremely high frequency, to avoid mixing in with the antenna oscillator, and causing unwanted theremin-like behaviors.

Any thoughts on what frequency I should use for the...

Non-inverting booster/overdrive. Good sound/freq response at lower gains, but farty at max gain. Switch the .1 cap for a .047 for good max gain sound, at the cost of reduced low-end response.
High Zin, low Zout, very tweakable. Mix and match the middle and top transistors however you want. They can both be NPN's, MOSFETs, or as shown, one MOS and one JFET.

I used 10k and 1M 'cause I order those values in bulk. But you can tweak them to taste, just make sure the top gate resistor (1M here) is...

By chance I stumbled across these pictures:

of this obscure unit which the user irishstu bought in taipei.

Since all the experts on the other forum were not able to help this poor guy why there is a dual pot used for gain I decided to trace this unit. Here is the result:
Muff-Rat schematic

I gave it the name Muff-rat because it remembers me on one side to a Big Muff Pi and on the other side to a Rat.
What is interesting on this unit is that from the components used it seems to have...

Hey, does anybody here ever tough about building a chorus using the PT2399 chip? :hmmm:
Any schematic? :lol: I think it's pretty possible using the EH Small Clone schematic...