Tonepad LPB 1 Booster doesnt work. Help!

Started by MESA-BOOGIE, September 08, 2004, 05:59:14 PM

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MESA-BOOGIE

Hi @ all.
I'm new here  :)

Have a Problem with A LPB 1 Booster.

The Bypass work.
But when I switch the Button to on, the loudness goes down  
and not up.  :?


Check the Pictures and Sound Samples I've posted on a german
Forum:

http://forum.musikding.de/yabbse/index.php?board=8;action=display;threadid=940


Thanx for your help.

vanhansen

I'm not good with German but I saw the first picture of your board.  I see a socket for the transistor but where is the transistor?  With out the transistor you won't get much of anything.
Erik

petemoore

Seeing Severin's pic, and reading the quote, reminds me why I miss Germany!!!
 As far as the booster, there's probly just a small wiring error or something like that.
  Take some pin voltages off the Transistor legs from ground...audio probe...you're // close I think.
Convention creates following, following creates convention.

martinbertrand

Hi, for an in depth look at the lpb-1, take a look at the analysis on effectronics from J. Philpott.

the file is in the "design" section : http://www.j.philpott.com/effectronics/

double check your wiring then take voltage readings on each leg of the transistor. we'll help you from there.
Martin Bertrand
www.lesdeloreans.com