BAJA Small Clone

slash555 · Post by **slash555** » 29 Sep 2009, 14:49

HEAD wrote:
slash555 wrote:hi bajaman, i'm noob in this area so a have couple of questions!
i made two small clones on your layout and none of them are working. sound is pasing trough but no chorus effect. probably same error on both of them.

i'm looking on tonepad schematic and i wonder about diode direction. negative pole on 1n914 i facing Q1 (5087), and on your layout + sign is twords Q1. it's same for D2. maybe i dont know how to read this

here's some voltages from transistors

Q1 5087
E 5,51
B 4,67
C ground

q2 (next to 4047)
E 7,25
B 7,86
C 7,9

q3
E 4,95
B 5,49
C 7,92

are potentiometer's 3 2 1 (like on tonepad layout) or 1 2 3?
what's trimmer for?

Hej,

I had a similar problem. Reason was what I tried to mark in the attached file. If you have these tracks on your PCB please cut them, otherwise they can cause a malfunction like you tend to have.

Cheers
Helge

Edit: When I did a second glance on your PCB it seems to me it is indeed the problem. If I don't see it wring you have these traces on your board. Cut them! Then it should work.
Edit: I attached a gut pic of my last built.

heh, i allready threw them away! i was pissed after 2 weeks of debugging and they ended up in trash

that indeed could be the problem!
i made new ones from tonepad and they are working flawless!

thanks for this, i'll be making them more in a while

HEAD · Post by **HEAD** » 30 Sep 2009, 11:28

slash555 wrote:
HEAD wrote:
slash555 wrote:hi bajaman, i'm noob in this area so a have couple of questions!
i made two small clones on your layout and none of them are working. sound is pasing trough but no chorus effect. probably same error on both of them.

i'm looking on tonepad schematic and i wonder about diode direction. negative pole on 1n914 i facing Q1 (5087), and on your layout + sign is twords Q1. it's same for D2. maybe i dont know how to read this

here's some voltages from transistors

Q1 5087
E 5,51
B 4,67
C ground

q2 (next to 4047)
E 7,25
B 7,86
C 7,9

q3
E 4,95
B 5,49
C 7,92

are potentiometer's 3 2 1 (like on tonepad layout) or 1 2 3?
what's trimmer for?

Hej,

I had a similar problem. Reason was what I tried to mark in the attached file. If you have these tracks on your PCB please cut them, otherwise they can cause a malfunction like you tend to have.

Cheers
Helge

Edit: When I did a second glance on your PCB it seems to me it is indeed the problem. If I don't see it wring you have these traces on your board. Cut them! Then it should work.
Edit: I attached a gut pic of my last built.
heh, i allready threw them away! i was pissed after 2 weeks of debugging and they ended up in trash that indeed could be the problem!
i made new ones from tonepad and they are working flawless!

thanks for this, i'll be making them more in a while

Hi,

dude, what a pitty! I smack my ass and call me Sally, if this wasn't the reason for your problems. You should read more often in the threads you post your debugging probs I suppose.

At least you got it working *thumps up* but the tonepad pcb would barely fit into a 1950B.

Cheers
Helge

slash555 · Post by **slash555** » 06 Oct 2009, 15:54

i found one the other day so i'll give it a try next time. i cut those traces right away

anyway, do you know how to make it little brighter? i have lots of hi-end roll off and a little volume drop. could it be wrong setting on trimpot?

slash555 · Post by **slash555** » 06 Oct 2009, 20:12

slash555 wrote:i found one the other day so i'll give it a try next time. i cut those traces right away

anyway, do you know how to make it little brighter? i have lots of hi-end roll off and a little volume drop. could it be wrong setting on trimpot?

nevermind, it works just fine when in front of amp, in effects loop i get hi end roll off and volume drop, dont know why?

rocklander · Post by **rocklander** » 14 Oct 2009, 20:13

thanks Baja

.. I etched my board last nite.. wow.. it's got some pretty tight tracks in some spots.. my fat @rse PCB pen struggled (the press'n'peel didn't seem to stick in those tight spots so had to 'touch up'

).. I'm not hopeful that my soldering skills will be up to non-bridging, but will have a go over the weekend.. you're a star mate!

quaternotetriplet · Post by **quaternotetriplet** » 10 Dec 2009, 01:48

hi bajaman, is it ok to use 2n3904 and 2n3906?

bajaman · Post by **bajaman** » 10 Dec 2009, 04:56

hi bajaman, is it ok to use 2n3904 and 2n3906?

I don't know - I cannot see why they would not work though.
Make sure you get the pin outs correct (and the correct NPN or PNP)

bajaman

Scruffie · Post by **Scruffie** » 10 Dec 2009, 05:04

For a little confirmation, one or two people in the tonepad build reports for the small clone reported the 2N3904 & 2N3906 working fine

quaternotetriplet · Post by **quaternotetriplet** » 10 Dec 2009, 12:24

nice thanks.

YuGi · Post by **YuGi** » 05 Jan 2010, 14:54

Hi all,
sorry for the noobie question

, how to regulate the trimpot?
thanks

rocklander · Post by **rocklander** » 05 Jan 2010, 19:37

YuGi wrote:Hi all,
sorry for the noobie question , how to regulate the trimpot?
thanks

I've made a couple of these, and I just adjusted the trim by ear... have you tried that?

YuGi · Post by **YuGi** » 05 Jan 2010, 20:30

rocklander wrote:I've made a couple of these, and I just adjusted the trim by ear... have you tried that?

No but I'm interested

Thank you

sfx · Post by **sfx** » 07 Jan 2010, 03:30

Shouldn't be too hard. The trimmer has just a portion of the sweep where the modulation becomes audible.

rasta_maleek · Post by **rasta_maleek** » 12 Sep 2010, 07:36

Hi all.
I have to say that Bajaman is the refer to a good pedal design

I finish mine with the best results.
Uploading some pictures and video, small clone.vs.ce2.
best regards.
Thanks a lot bajaman.

rasta_maleek · Post by **rasta_maleek** » 12 Sep 2010, 07:39

sorry, here are the videos

bajaman · Post by **bajaman** » 12 Sep 2010, 07:46

DrNomis · Post by **DrNomis** » 12 Sep 2010, 08:58

Cool,now here's another project I'm going to have to build...

I like the lushness of the sound of this Small Clone pedal...

I wonder if there is a project for the EH Small Stone pedal?,the reason why I'm asking is that I am a fan of Jean Michelle Jarre's music,I have both the Oxygene and Equinoxe albums,I'm planning on building myself at least one,maybe two EMS Synthi/VCS 3 synthesizers once I can get all the circuit layouts for Stripboard done,i want to build these so I can get the sounds Jean gets on those albums,I've probably got alot of work ahead of me...

rasta_maleek · Post by **rasta_maleek** » 12 Sep 2010, 21:32

bajaman wrote:

Thanks boss, when you will need quality video, I'm you man.

rasta_maleek · Post by **rasta_maleek** » 13 Sep 2010, 18:51

bajaman wrote:

And forget to say that i added some mods.
1-status pulse led
2-vintage/modern sound switch
3-extra speed switch

ryanuk · Post by **ryanuk** » 13 Dec 2010, 11:17

Chaps

Building this for an xmas present for a friend.

The only part I cant obtain is a 2n7 capacitor!! Could I sub a 2n2?

RyUK