Earthquaker Devices Speaker Cranker

[Harmony-Rocket]

This sounds really interesting to me!
http://www.youtube.com/watch?v=DV59cwA_mzA
Seems to have a very open sound, perhaps a little jangly?
Would give it a clear go though!

[johnk]

I drew up a vero for it if you want one. (it's also verified).

john

[LettucePrey]

There was a speaker cranker vero up for a while but it was removed. I'm sure there was a legitimate reason.

[peavey_xxl]

I would like to have a go at this vero!

[johnk]

here's a pic of mine:


and here's the vero for it:
http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/SpeakerCranker/01-speakercrankerVERO.png


and BTW, the 1N60's in the original EQD SC are actually the shottky orange glass ones and not the germanium ones.

[peavey_xxl]

Thank you!  I will give this a try.

[Harmony-Rocket]

Thanks John - thats a big favour!!!
Will have a cranked weekend ;)

Btw: is this an orig enclosure or did you copy the eqd artwork?
Looks like the original!

[johnk]

I copied the artwork from a pic of one online and made a decal for it with photoshop, then applied it to a yellow powdercoated 1290, and shot a few coats of clear poly over it.

[Harmony-Rocket]

Bullseye - supercool!

[IvIark]

Nice job John

[LettucePrey]

Hey John, Pedal looks great. One question on the layout...the one that was posted here a while back had the transistor facing the opposite direction (CBE were still the same)...does this affect the sound?

Also, did you use water slide decals?

[Meh]

I just built this vero layout and it doesn't seem to work.

I've checked the layout several times, checked for cold solders and fused tracks, but everything checks out.

I've replaced the transistor, no difference.

1. Are you certain this vero layout works?

2. Is the orientation of the transistor, the diodes and the polar caps correct?

3. Is there a schematic I can compare the vero to?

Thanks!

[johnk]

i'm ositve that it works. I built mine off of it and it works exactly like the original.

[Meh]

John,

Thanks for the confirmation. Must be a cracked trace somewhere. I'll breadboard it and see if I can get it going that way.

Thanks.

[johnk]

well, it's a pretty simple circuit without many components so it shouldn't be difficult to get it running. good luck with it.

[Meh]

Weird. Works when breadboarded, but not on the vero. Pot allows clean signal through when hard left, but attenuates the signal as it's dialed up, until there's nothing at full clockwise.

I have:

1. Used all new parts and all new vero. Parts came directly off the working breadboard.

2. Checked the traces for joins & voids.

3. Re-flowed all of the joints.

4. Verified that there's power to the board.

Since there aren't enough ground points on the board, I've got the ground wire coming to a breadboard, then the grounds for VR1, power ground, both jack grounds and the LED ground coming to the - rail on the breadboard. LED lights up fine.

The only deviation from the circuit was swapping the 10K LED resistor for a 4.7K (I prefer it a little bright). Otherwise, all components are as drawn.

Suggestions? Anyone have voltages at critical pins they can share?

[Meh]

Still troubleshooting.

Input: 9.45V

Voltages at the transistor:

C:  .48
B: 1.04
E: 8.52

[Benno]

Hi Meh, you should have the 8.52 volts at the collector rather, try flipping the transistor

[Meh]

BINGO! Many, many thanks!!

Does this mean that the orientation of Q1 on the vero is 180 degrees out?

[Meh]

Never mind. I think I've been reading Vero layouts wrong. I always assumed that I was looking at the strip side and that the components were on the other side, shown in x-ray. It's the other way round: I'm looking at the true components and the strips are on the far side.

Dork.