overdrive/fuzz quest

[johnk_10]

Originally Posted by Road Bull

Good luck. I just picked one up a little while ago. I think it and the Sanford and Sonny BB are my two favorite pedals atm. I would be interested to hear your pedal. Are you putting a second gain/boost switch? If so, are you connecting a volume pot to said switch?

mine is an exact copy of the TS-50, so yes it has the boost feature. I don't know if i'll add a separate volume control for it, but maybe an internal trim pot instead. I found the MPS8598's at mouser.

[johnk_10]

finally got the components mounted on the vero for the rusty/TS-50. I just need to make a dual supply charge pump for it and install the wiring, and hopefully it'll be good to go.

[Codger]

Ow-sum. Been waiting on this one.

[johnk_10]

I finally got the power supply built and tested for it. I made it so it'll run off of a regular 9V power supply like a one spot, but since this pedal needs a bipolar supply ( +15 and -15V) I made two small daughterboards (using the original Traynor schematic) rather than putting them on the main board. that way everything will fit a bit easier in a 1590 enclosure.

here's a pic of the two daughterboards. the larger one converts 9VDC into +17.5 and -17.5 volts and the smaller one converts that into +15V and -15V.

[andrew]

Originally Posted by johnk_10

after looking at that schematic, with three TL072 opamps and three J113 JFETs it would be a pretty complicated build, and since you can get them for only $99, i'd rather buy one than build one from scratch.

Can the pedal be modded to have a blend control?

[johnk_10]

Originally Posted by andrew

Can the pedal be modded to have a blend control?

that wouldn't be difficult if there's room inside of it for the extra circuit and blend pot.

[Road Bull]

Originally Posted by johnk_10

I finally got the power supply built and tested for it. I made it so it'll run off of a regular 9V power supply like a one spot, but since this pedal needs a bipolar supply ( +15 and -15V) I made two small daughterboards (using the original Traynor schematic) rather than putting them on the main board. that way everything will fit a bit easier in a 1590 enclosure.

here's a pic of the two daughterboards. the larger one converts 9VDC into +17.5 and -17.5 volts and the smaller one converts that into +15V and -15V.

So if you can make the board work with 9VDC, then why would companies like Tronographic make their pedal run AC and whatnot? It would be nice if I didn't have to have a separate power source for the Rusty Box. Is there that much difference in sound from the varying power requirements?

[johnk_10]

here's the good news and bad news on the Rusty. the good news is that my Rustybox preamp works perfectly and sounds great. the bad news is that the ICL7660S charge pump doesn't supply enough current for it. to test it I had to use two large benchtop power supplies (one set at +15V and the other at -15V), so that's the reson that tronographic uses a dedicated power supply.

[andrew]

Originally Posted by johnk_10

the good news is that my Rustybox preamp works perfectly and sounds great.

Did you make any tweaks to the original design?

[johnk_10]

not yet. for some reason mine's treble control is a bit too bright (if it's at 10 o'clock or above) so i'll probably change that, but otherwise it sounds really good.

[UncleFluffy]

Originally Posted by johnk_10

here's the good news and bad news on the Rusty. the good news is that my Rustybox preamp works perfectly and sounds great. the bad news is that the ICL7660S charge pump doesn't supply enough current for it. to test it I had to use two large benchtop power supplies (one set at +15V and the other at -15V), so that's the reson that tronographic uses a dedicated power supply.

http://www.ti.com/ - click on "power architect" and play

[johnk_10]

thanks!
well, I kinda solved the bipolar PS with a really simple solution. if I use a 12-15V DC wall wart with an LT1054 charge pump to turn it into a bipolar supply it works great.

I only have ICL7660S's on hand right now (they're limited to a 12V input max) and used a 12V TC electronic wall wart with the 7660S to give it +12 &-12Volts and the pedal works great. I think that it might be a little better running on a dual 15V supply (like the original Traynor schematic) but I won't know that until my LT1054's arrive later this week (the LT1054 has the same pinout and plugs into the same socket as the ICL7660S).

here's a pic of the tiny bipolar converter:



i'm also going to try powering the LT1054 with a charge pump converting 9v to 15V) so I can use a standard Boss or 1Spot 9V power supply to run it.

[Silver Blues]

Hey john, a question for ya, not to jack your thread. I know (you probably do too) you can do a voltage inverter for +9v to -9v with a 7660S, but if you flipped the polarities of the two caps could you also do -9v to +9v?

--Silvie

[karter2000]

Probably a dumb question, but did you base your build on the TS-50 or TS-50B?

[johnk_10]

Originally Posted by Silver Blues

Hey john, a question for ya, not to jack your thread. I know (you probably do too) you can do a voltage inverter for +9v to -9v with a 7660S, but if you flipped the polarities of the two caps could you also do -9v to +9v?

--Silvie

yep. that's correct.
I finally got it working the way that I wanted it to. since the preamp requires more current than a single ICL7660S charge pump can produce for it, what I ended up doing was using two of them. one to double the +9V to +18V, and the other to turn +9V into -18V. then I ran them into another tiny board to turn the + and - 18V into + and - 15V. now the RustyBox works perfect with these small circuits using a standard 9V 1Spot power supply or a common Boss 9V adapter.

here's a pic of the three tiny power supply daughterboards that will easily fit in the enclosure:

[johnk_10]

Originally Posted by karter2000

Probably a dumb question, but did you base your build on the TS-50 or TS-50B?

the TS-50B

[johnk_10]

well here she is ready to rock:





gut shot:

[Duke21]

John, do you know which stomp box gives the best kind of Marshall OD/ distortion? Is it the Marshall GV-2 or the Sansamp British V2 ?

[andrew]

Originally Posted by Duke21

John, do you know which stomp box gives the best kind of Marshall OD/ distortion? Is it the Marshall GV-2 or the Sansamp British V2 ?

O.G. Marshall Guv'nor pedal.

[johnk_10]

Originally Posted by Duke21

John, do you know which stomp box gives the best kind of Marshall OD/ distortion? Is it the Marshall GV-2 or the Sansamp British V2 ?

IMO, the wampler plexidrive.