EHX LPB-1
Posted Sun, 2009-12-20 16:54 by Harold
Project description
The well-known LPB-1 clean booster pedal from Electro Harmonix based on the schematic from Beavis Audio.
Bill of materials
| Resistors | |
|---|---|
| R1: 1M | |
| R2: 10K | |
| R3: 100K | |
| R4: 390R | |
| Potentiometers | |
|---|---|
| R5: 100K Log (A) | |
| Capacitors | |
|---|---|
| C1: 100nF | |
| C2: 100nF | |
| Transistors | |
|---|---|
| Q1: 2N5088 | |
| 2 trace cuts |
List
Click here to see the bill-of-materials as a list or download it as a comma separated values file (.csv).
Code
BB Forum code
HTML code
Comments
Mis-bias problem...I think
Submitted on May 12th, 2013 by AnonymousI've built the circuit and am 99.9% sure that theres no problems with lumps of solder crossing the tracks or anything and that all parts are correct and in the right place but what happens is this. . . .
...In order to get some noise out of my guitar I have to hit the strings quite hard and even then theres a delay between hitting the strings and hearing it.
I've had a look round the interweb and it seems that there is a mis-bias somewhere. I've swapped the transistor but i'm still getting a horrible sound.
Any ideas ?
Thank you...I love this site :-)
Can you post the voltage of
Submitted on May 29th, 2013 by adminCan you post the voltage of each pin of the transistor you used?
Voltage
Submitted on May 31st, 2013 by fictionukSorry but i'm somewhat a newbie with all this and i'm not sure how to do it.
I've got a cheap DMM but am a little unsure what to do with it
Thanx
Dean
Capacitors...
Submitted on April 30th, 2013 by AnonymousJust a quicky ! It seems i've run out of caps, can I use 100v capacitors ? I know its a little restrictive due to there size but its just to test it.
Thanx
100V
Submitted on May 3rd, 2013 by adminJep, no problem (except for the size) ...
Works!
Submitted on July 30th, 2012 by AnonymousMy first pedal I built. Works finally! Good overdrive sound if you crank it all the way up.
Transistors Question
Submitted on May 12th, 2012 by AnonymousCan I replace the 2N5088 with 2N2222 or 2N3904 without any issues?
I must say your site rocks!!!!!!!!!!
new at this,
Submitted on November 15th, 2011 by Anonymouswhats a gnd?
GND
Submitted on November 16th, 2011 by adminThe ground connection...
2N4401
Submitted on November 6th, 2011 by AnonymousYep, the 2N4401 works fine.
Transistors
Submitted on October 23rd, 2011 by AnonymousCan I replace the 2N5088 with a 2N4401 with no problems?
Just to help clarify...
Submitted on June 1st, 2011 by AnonymousJust to help clarify, the red square with red dots indicate that the PC board strip electric connector is broken, right?
exactly
Submitted on June 20th, 2011 by Anonymousexactly
I built it and it works.
Submitted on January 28th, 2010 by AnonymousI built it and it works.
Awesomeness! This site is
Submitted on December 24th, 2009 by AnonymousAwesomeness! This site is great and the layouts are awesome! Thanks a lot!!!