Big Dipper (Dipthonizer+) a Modified "Honey Dripper"

[Cybercow]

I was able to obtain a couple MadBean 2015 "Honey Dripper" (Colorsound Dipthonizer) PCBs for a custom commission request and got it built out with the requested modifications.

This is a sweet, versitile auto-wah sort of circuit from the 70's. Instead of a single, fixed filter, it has a 'formant' selector switch for generating (simulating) four different vowel formants with a sweep rate adjustment and a fuzz blend control. And while the "fuzz" is actually just a a pair of soft clipping diodes on a parallel drive circuit (opamp), the OD it provides adds some nice grit to the effect when desired.

Originally designed to fit into a 125B enclosure, the requested mods demanded a larger box, so I was able to get it all stuffed into a 1590BB enclosure.

The added modifications were a Low, High (EQ) and Volume circuit after the Dipthinizer circuit.

At the Volume midpoint, the pedal is at unity gain and gets a good bit louder after the Volume is turned up from the 'noon' position. The Lo & Hi controls give an exaggerated range of bass & treble. I selected a GuitarPCB "Tone TwEQ" for the added EQ/Volume mod.

This turned out to be one of the better auto-wah circuits I've ever had the opportunity to play with. When I started this project, I was unaware how rare the original Dipthonizer pedals are. Glad I acquired a second PCB to build one for my rig.

Video demo here: https://www.youtube.com/watch?v=iSSLvyh_174

So enough of the babble . . . . onto the circuit porn . . . .

[jimilee]

Nice, and very elegant looking. I find that every time I build for someone else, I end up building another one for myself. Kind of a, "I want one!."

[Bio77]

That looks sharp! 

I watched the video.  I noticed the sweep knob is only active last part of the turn.   I had this in my build.  I'd recommend adding a 2k resistor across legs 2 and 3 to convert the 10kB to a 10kC.  You can do it on the boxed circuit.   

https://www.madbeanpedals.com/forum/index.php?topic=31380.msg301981#msg301981

[Cybercow]

Nice, and very elegant looking. I find that every time I build for someone else, I end up building another one for myself. Kind of a, "I want one!."

Thanks Jimi. I suffer that same "me too" syndrome.

[Cybercow]

That looks sharp! 

I watched the video.  I noticed the sweep knob is only active last part of the turn.   I had this in my build.  I'd recommend adding a 2k resistor across legs 2 and 3 to convert the 10kB to a 10kC.  You can do it on the boxed circuit.   

Thanks for that Bio77. I noticed that too when I built it - even before stuffing it. It behaves the same as in the original Colorsound Dipthonizer too, only in reverse. (At least, in the demos I've seen.)