Wampler - Cranked AC.

aziltz · Post by **aziltz** » 25 Feb 2009, 21:23

Wampler Super Ecstacy or CrankedAC?

Schematics?

indyguitarist · Post by **indyguitarist** » 27 Feb 2009, 17:47

I forgot... I accidentally described the pinnacle instead of the cranked AC, sorry!

The cranked AC is simply a jfet circuit that is eq'd somewhat similar to the preamp of an ac-30. The only difference is that there are 3 gain stages, and each jfet stage has 2 jfets in parallel in place of one jfet. 15k drains, 1k source. dual lowpass filters at the end, additional lowpass filter for a tone control.
bw

RnFR · Post by **RnFR** » 27 Nov 2009, 13:19

i found the schemo in the instructions at the toneclone kit site. it uses parallel JFETs in all of the gain stages which is pretty interesting. i don't think i've seen that anywhere else before. i've heard good things about this pedal, i may have to give it a try. incidentally, i think the the pcb's are around 6 bucks a piece which isn't half bad. a decent option for a printed board.

here's a link to download the instructions which has the schematic contained inside. maybe i'll recopy it if i'm not too lazy so we can get it attached to the forum.

http://www.toneclonepedals.com/media/cr ... ctions.pdf

SPeter · Post by **SPeter** » 27 Nov 2009, 13:49

Many thanks RnFR!

Greg · Post by **Greg** » 27 Nov 2009, 14:38

Cool thanks
.. looks like they have all the instructions up on there.

culturejam · Post by **culturejam** » 27 Nov 2009, 15:55

For $6, I'd just buy the PCB. That's a very fair price, and the boards look pretty nice. (< hey, that rhymes!)

RnFR · Post by **RnFR** » 27 Nov 2009, 23:35

yeah man. nice fabbed board, dirt cheap. one question though. is this brian's company? i know he had some problems with some other guys, and if this were them, i might just have to hold off on the purchase.

Greg · Post by **Greg** » 28 Nov 2009, 00:34

RnFR wrote:yeah man. nice fabbed board, dirt cheap. one question though. is this brian's company? i know he had some problems with some other guys, and if this were them, i might just have to hold off on the purchase.

No I believe they're not associated any more.

The other pedals are clones, but strange that they're still selling his design unless they were involved in developing it or a deal was done.

IvIark · Post by **IvIark** » 28 Nov 2009, 00:43

I'd buy a few of the PCBs but $21 postage is taking the piss

RnFR · Post by **RnFR** » 28 Nov 2009, 07:15

IvIark wrote:I'd buy a few of the PCBs but $21 postage is taking the piss

well i did not see the shipping. i can safely say i won't be ordering any pcb's. for both reasons.

sinner · Post by **sinner** » 28 Nov 2009, 08:24

Is that single sized PCB? If so, it should be finished soon... I think Brian Wampler said in other topic that he had some issues with them, if that is true, and he see no problem, I'll post the PCB here

sinner · Post by **sinner** » 28 Nov 2009, 08:31

Shit, now I see it's not single sized

himister · Post by **himister** » 28 Nov 2009, 10:22

sinner wrote:Shit, now I see it's not single sized

Too bad...there's no clear shot of 2nd pcb layer inside project file.

RnFR · Post by **RnFR** » 28 Nov 2009, 10:59

if i get some time, i'll try and draw one up.

himister · Post by **himister** » 28 Nov 2009, 11:30

That would be cool, specially if it would be a single layer.

SPeter · Post by **SPeter** » 28 Nov 2009, 14:24

IvIark wrote:I'd buy a few of the PCBs but $21 postage is taking the piss

That's why they are cheap!That price is misleading! Part of it is included in the shipping costs!

IvIark · Post by **IvIark** » 28 Nov 2009, 14:36

I wouldn't mind paying it if that was what the postage cost, but I've had a Priority Flat Rate Envelope with about 2lbs of resistors in it from the US and it was $11.95 as long as they fit in the box. You could get hundreds of PCBs in one.

RnFR · Post by **RnFR** » 29 Nov 2009, 00:33

i did up the pcb. if someone could look over the schematic that would be great. and if anyone wants to try and verify this thing, go for it. it's been checked in eagle, so it should be good.

LAYOUT VERIFIED.

RnFR · Post by **RnFR** » 29 Nov 2009, 07:20

i doubt it. it probably is just part of an earlier revision. i would think that the cap in question could add too much gain or could cause oscillation without some sort of compensation capacitor.

gnognofasciani · Post by **gnognofasciani** » 29 Nov 2009, 13:49

I'm sorry if it is a n00b question, but: what should be the effect of using two fet in parallel?

Thanks

Wampler - Cranked AC. [traced]