Malekko wolftone - Chaos

night-butterfly · Post by **night-butterfly** » 28 Jun 2012, 13:04

Hi! This is my first contribution here

I received this baby today in the mail box. The octave is really insane! Check the demo at PGS :
Here are the guts, I'll add the back of the board in a few moments...

Enjoy!

night-butterfly · Post by **night-butterfly** » 28 Jun 2012, 13:11

Just removed Pots and switches to turn around the board, here it is!

night-butterfly · Post by **night-butterfly** » 28 Jun 2012, 13:19

Looks like it shares the same PCB with the malekko wolftone helium since there are unused holes and traces on top side of the PCB. No components hidden backside.
From what I found :
Entropy : B 500 K Drive : B 50 K Vol : B 50 K
Ic : RC4558P from texas instuments
Diodes 1 to 14 : 1n4148 D15 : 1n4001
The transformator is marked : TM117- R 11415 I suspect it to be the same as in the Octavia
R1 : 510 R2 : 1K R4 : 100K R5 : 100K R6 : 470K R8 : 1.2M R10 : 75K R13 : 10 K R14 : 10K (I miss some resistors numbers on the Pcb

)
C1 : 1n box c2 : 1uf box c3: 100n box c4: 4n7 box c5: 10n box c6:1uf box c7: 100uf pola c8: 100uf pola c9: 47uf pola

Tell me if you need something about it, I'll take a look

night-butterfly · Post by **night-butterfly** » 28 Jun 2012, 13:38

Here is the components placements :

Here are the full tracks upside :

night-butterfly · Post by **night-butterfly** » 01 Jul 2012, 07:46

Gave it a try at full volume today. There are 2 problems: notable hiss when engaged, and you can hear a really subtle octave effect when not engaged (even if it is said true bypass ). I think it can really be improved!
I'm still working on the schematic but I'm not a pro at it...

greenskull · Post by **greenskull** » 02 Jul 2012, 02:26

Input may need to be grounded when bypassed to stop bleed through. The video demo sounds like a Scrambler on steroids.... very good!

night-butterfly · Post by **night-butterfly** » 02 Jul 2012, 20:36

I played with the box and as time passes I was really disappointed by the octave bleed when bypassed and by the hiss when engaged. There's room for good modifications here. Signal passes in the PCB directly after the jacks in really tiny traces, going to the switch at the opposite of the board, so is there some inductance in the traces when bypassed?
So I unboxed it completely and traced it. There are some traces I can't see (under the 2 dpdt for example) but here is what I gathered :
First here are the upper side traces

Then the underside traces