Mutant Vactrol VCF ttt
MUTANT VACTROL VCF for Eurorack synthesizers - VC vactrol based multimode filter.
It's Scott Stites Mutant Vactrol Filter. Thanks a lot to Scott for kindly allowing us to use the design!
Power consumption: V+ 30mA, V- 26mA.
PCB - 2mm thickness, gold platted, black mask. $30
Two panels - 16HP front & back. Anodized alu, black print. $35
SMD parts + soldering. $15 (Who order SMD soldering please note if 15V version in payment comments, I make 12V by default)
Shipping per set: $5 - only board, $8 - board+panels.
TOTAL for complete set with shipping: $88
Assembled module $360 + $15 shipping.
Thread at MuffWiggler forum http://www.muffwiggler.com/forum/viewtopic.php?t=63745
The design is adapted for Eurorack format but 15V is possible with changing of resistor value. Boards have mounting holes for M3 screws, footprints of potentiometers, switches and power connector are compatible with MTA100 headers. Jacks can be wired with shielded or other wires. So 5U-ers are welcome.
PCB from both sides:
PCB with soldered SMD parts:
MOUSER SHOPPING CART WITH TL072. MERCHANDISE TOTAL: $45.71 (USD)
MOUSER SHOPPING CART WITH OPA2604. MERCHANDISE TOTAL: $79.66 (USD)
Parts not included in Mouser shopping carts:
2 vactrols VTL5C3/2
4 FETs MPF102
Where to buy?
I included into Mouser shopping cart Kobiconn jacks. But they need to solder a leg for ground connection.
Assembling is pretty easy. Everyone can do it in a couple of hours.
Solder through-hole parts from low to high. First 10R resistors and diodes.
Then IC sockets.
Important issue about power cables. I used Cwejman cable (white on the photo) which made upside down comparing to other manufacturers.
As it turned out, Cwejman is the only manufacturer making this way. Check your cable before soldering power connector.
Then caps, transistors, power socket, vactrols and trimpots. From low to high.
Now clean bottom side. Look how clean it is obtained.
3. Mounting hardware.
Erthenvar jacks are too high in comparison to Kobicon. Cut these legs with pliers. We need to achieve 10mm between board and panel.
Kobiconn jacks need ground leg soldering. I use cutted resistor legs.
These spikes on pots need to be cuted.
Now insert all hardware but don't solder. (Mount spacers first, I forget here and mount later but better now.)
I use thin washers with Kobiconn jacks to achieve 10mm.
Now place a panel. Don't overtighten a nuts, just by hand.
Check everything is exactly precise.
Now solder. Be accurate, hard to clean now if to make dirty.
Now tight a nuts, not strong just a bit. Pots have a washers, so screwdriver doesn't scratch a panel.
Switches and jacks haven't washers, so some protection is needed, I use insulating tape.
Ready. Very nice and precise.
Backpanel. Use nice screws!
United colors of L-1 !!!
(c) 2012 L-1 Synhesizer. E-mail: firstname.lastname@example.org