Low volume mud bunny

[yanko_mr]

Hi, after a long break I am triying to fix my mudbunny, and I really dont know whats wring with it, in the off postition the bypass is working, on the on position is givinig me a really low signal.

I triple chack all the conections and values, and they look fine.







here some pics

[mgwhit]

I don't know if the photos are working for anyone else, but I'm not getting anything other than the thumbnail size.  If you can get some larger versions up there I'd be happy to go over them.  (And apologies if this is just a me-and-my-browser issue.)

Please let us know what version of the Mudbunny you built.  What parts/values did you substitute?  Which transistors did you use?

Can you measure and post the voltages on each pin of Q1, Q2, Q3 and Q4?

Did this board ever work and is now acting up, or has it been malfunctioning all along?

[DutchMF]

Thumbnails here as well, nice carpet though! 

Paul

[yanko_mr]

I am sorry, jajaja

heres a link to the album,

https://picasaweb.google.com/102836483918153422220/Pedal#

[marmaliser]

What transistors ?  Mine was low on volume until I turned around all the bc550's to the opposite of the silkscreen.  Now it screams

[jkokura]

Yanko, I can't see anything from the shots you've given. I would suspect either a wrong value part or a backwards transistor(s) simply by your description. We would need some high definition macro shots of the top and bottom of the PCB if you want us to look at that.

Jacob

[yanko_mr]

2n5088 b29

[yanko_mr]

Ok this pics are better, sorry there wasnt enought light in the morning,







you can also check the album i post before


thank you

[mgwhit]

I haven't seen any bad values so far, but the back of the board has some dodgy soldering.  I'd recommend touch up any of the ugly joints, and doing some basic continuity testing with a multimeter.  Good luck!

[jkokura]

Yes, I agree. You may have cold solder joints. It doesn't look awful, but it doesn't look really good either.

A key to a good solder joint is to use a well heated iron, and to not use too much solder. It looks like you have in some cases used not enough heat and too much solder.

Pinout would be correct if you're using the 5088.

Jacob

[yanko_mr]

I know it look ungly, jaja it was my first, but i check all the point with my multimeter and they are fine,

[mgwhit]

The proof's in the pudding.    Let's see those transistor pin voltages!

[jkokura]

I'm not sure how you checked it with your Multimeter, but you may have been checking wrong.

I will say however, that despite being ugly, the ugliness has nothing to do with the quality of a solder joint. It may look fine, and it could still be cold. However, ugly joints usually point to there being not enough heat or too much solder, which may be giving you your result. I still recommend removing the excess solder and redoing some of the solder joints you've done that look suspect.

I encourage you not to assume anything at this point. You've said that your parts and wiring check out, but I know plenty of examples of people who've said the same thing only to find a resistor with the wrong value on their PCB, or faulty wires, or...

Transistor voltages would also be helpful for us at this point too.

Jacob

[yanko_mr]

You were rigth, now it is rocking, thank you all,

[mgwhit]

Congratulations -- enjoy!