Crazy Tube Circuits - Constellation Fuzz

Ben N · Post by **Ben N** » 06 Nov 2018, 10:19

https://crazytubecircuits.com/constellation/
Just came out at winter NAMM. Probably nothing terribly original in there, but I'd like to see how they managed the switching between the three germs to get all those classic fuzz tones (FF, TB x3, RM, RM>FF). Demos do sound good.

Nocentelli · Post by **Nocentelli** » 06 Nov 2018, 21:46

The first three options are essentially the same circuit with a few cap value variations and using only two of the three transistors. The TB mkii and RM->FF are basically the same circuit (again, maybe a cap or two switched) using all three trannies and the RM would just bypass the second and third transistors. However, I can't see how that could be done with the usual 2P6T rotary switch, so there is either a very complex multiple pole passive switch or some fancy digital switching going on. Interesting.

plush · Post by **plush** » 07 Nov 2018, 14:23

Nocentelli wrote:very complex multiple pole passive switch or some fancy digital switching

Or some rotary pole dancers stomping on cmos/fet switchers.

Ben N · Post by **Ben N** » 10 Nov 2018, 23:45

It does seem as though a microcontroller and some cmos switches must be involved.

gonzomode · Post by **gonzomode** » 07 Jun 2020, 12:53

Pots are c1k for gain and b500k for volume

Ben N · Post by **Ben N** » 07 Jun 2020, 13:08

Huh! So it really is just a 2P6T rotary switch! Looks pretty traceable/DIY-able, doesn't it?

Nocentelli · Post by **Nocentelli** » 08 Jun 2020, 11:14

Ben N wrote: ↑07 Jun 2020, 13:08 Huh! So it really is just a 2P6T rotary switch! Looks pretty traceable/DIY-able, doesn't it?

Yep, although it seems weird to go to all that effort and not include a voltage inverter so you have to use a separate power supply.

soulsonic · Post by **soulsonic** » 08 Jun 2020, 17:34

Nocentelli wrote: ↑08 Jun 2020, 11:14 Yep, although it seems weird to go to all that effort and not include a voltage inverter so you have to use a separate power supply.

It would have been so easy for them to do this as a negative ground circuit, even without an inverter. Lack of imagination.