Akashic Guitar effects circuit lookup
123

Enclosure not stated

Scientific Guitarist

Wobble BoxThe Accidental Chorus/Vibrato

Price
see vendor

From the vendor

Alright, you say, why is this the accidental chorus/vibrato? Well, I didn't set out to make this pedal at any point. In fact, I was playing with the ES56033 chip to try to understand its mechanism for time adjustment a little better to see if it could be used in the development of a flanger. In order to do that, I was trying to find a way to modulate the delay time using an LFO. I found out experimentally that I can get some modulation with a set delay time, but I couldn't find a way to actually change the delay time in a way similar to how a PT2399 can be done.

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My thinking is that the ES56033, because it has the F_adj pins, probably has some sort of internal compensation, making techniques like an LFO on one pin, or a current sink somewhere ineffectual. I still don't understand exactly what is happening, but I do know that this chip won't work for a flanger. That being said, that d

Schematic

The schematic is in the vendor's build document, page 1. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 44 rows

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RefValueNormalizedTypeNotes
Resistors 16
×168R68Resistorshopping list
×1120R120Resistorshopping list
×11k1kResistorshopping list
×11k81.8kResistorshopping list
×24k74.7kResistorshopping list
×410k10kResistorshopping list
×312k12kResistorshopping list
×315k15kResistorshopping list
×222k22kResistorshopping list
×133k33kResistorshopping list
×2100k100kResistorshopping list
×1120k120kResistorshopping list
×1180k180kResistorshopping list
×4220k220kResistorshopping list
×1330k330kResistorshopping list
×11M1MResistorshopping list
Capacitors 14
×147pF47pCapacitorshopping list
×1100pF100pCapacitorshopping list
×1220pF220pCapacitorshopping list
×21nF1nCapacitorshopping list
×44.7nF4.7nCapacitorshopping list
×110nF10nCapacitorshopping list
×247nF47nCapacitorshopping list
×4100nF100nCapacitorshopping list
×11uF1uCeramic/Film Capacitorshopping list
×21uF1uElectrolytic Capacitorshopping list
×14.7uF4.7uElectrolytic Capacitorshopping list
×122uF22uElectrolytic Capacitorshopping list
×247uF47uElectrolytic Capacitorshopping list
×2100uF100uElectrolytic Capacitorshopping list
Diodes 1
×11N41481N4148shopping list
Transistors 1
×1BC548BC548shopping list
ICs 2
×1LM7805LM7805shopping list
×3TL072TL072shopping list
Potentiometers 3
×1A1kA1kPotentiometershopping list
×1B50kB50kPotentiometershopping list
×1C100kC100kPotentiometershopping list
Trimmers 1
×110k10kTrimmershopping list
Switches 1
×13PDT3PDTfootswitchshopping list
LEDs 1
×1LEDLEDshopping list
Jacks & sockets 2
×21/4”1/4”input jackshopping list
×1DCDCpower jackshopping list
Other 2
×1ES56033EES56033Eshopping list
×1EnclosureENCLOSUREshopping list