Psionic Audio Fuzzy Logic

zosotone · Post by **zosotone** » 02 May 2013, 23:11

Nice reverse buffer. Works well if you love the buffers and fuzzes too. Seems a simple circuit. I'm checking the values...

zosotone · Post by **zosotone** » 02 May 2013, 23:45

- Pot it's 10K lineal.
- Panasonics are 22nf.
- Resistors on the left: red, brown, black, orange and brown.
- Resistors on the right: green, white, white, orange, brown.
- Letters on the side os the transformer: 0912S
- Blue capacitor: 3312

Bernardduur · Post by **Bernardduur** » 03 May 2013, 11:07

Cool! No power supply needed???

zosotone · Post by **zosotone** » 03 May 2013, 11:17

Bernardduur wrote:Cool! No power supply needed???

No, it's a passive effect. Should be placed just before the fuzze(s) in a effect loop. Works well with treble boosters too...

DrNomis · Post by **DrNomis** » 03 May 2013, 11:39

Any possibility of getting a schematic drawn-up?, wouldn't mind building one......

zosotone · Post by **zosotone** » 03 May 2013, 11:44

Can anyone help me do this scheme or layout? It's the first time I do it

I thing it's very similar to the Guitar Pickup Simulation of AMZ (Jack Orman) http://www.muzique.com/lab/pickups.htm

I will take best pictures of the PCB...

zosotone · Post by **zosotone** » 03 May 2013, 17:56

The back of the PCB.

Switch is 2 positions DPDT

Mbas974 · Post by **Mbas974** » 04 May 2013, 22:05

interesting ! tx for posting

lohstah · Post by **lohstah** » 05 May 2013, 07:48

pictures of the component side are not good enough to discern the connections...either post better ones or look where the components connect and tell us.
start of the circuit must be completely similar to the muzique circuit, up to the sc-hb switch. check from then on to see where the rest of the components fit in. 330p cap must be at the end of the circuit to gnd, res pot is the tone pot, one of the 22n caps is prolly in the tone pot circuit to ground.

cheers,
lohstah

zosotone · Post by **zosotone** » 11 May 2013, 11:33

More pics...

andrej · Post by **andrej** » 11 May 2013, 21:17

i bet on:
http://www.muzique.com/lab/pickups.htm + a buffer before it.

what you don't know is that it's not needed: fuzzes and treble boosters like high impedance (reactive or resistive, whatever) on the input, which is why they don't like buffers. you just need to add a 50-100K resistor (or a 100K pot/trimmer) between the output of your buffer of choice and the input of the fuzz pedal.

tried it and it works like a charm.

Nocentelli · Post by **Nocentelli** » 11 May 2013, 21:31

Passive buffer?

andrej · Post by **andrej** » 12 May 2013, 05:18

oh wow! no buffer at all, didn't look