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 (https://www.youtube.com/watch?v=iSSLvyh_174)
So enough of the babble . . . . onto the circuit porn . . . .
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!."
That looks sharp! 8)
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 (https://www.madbeanpedals.com/forum/index.php?topic=31380.msg301981#msg301981)
Quote from: jimilee on September 24, 2021, 08:25:45 PM
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. ;)
Quote from: Bio77 on September 24, 2021, 11:50:09 PM
That looks sharp! 8)
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.)