Build - Pedal Project: LPB-1
The Electro-Harmonix LPB-1 is a classic boost circuit. It is a very barebones boost based around a silicon transistor. Its low parts count makes it a great project for inexperienced builders, and also makes it a good candidate for turret board builds in smaller enclosures like a 1590B. LPB-1 can be used to drive your tube amp into breakup, and it is a favorite to boost the input of a big muff for even more saturation.
Figure 1: Turret board layout of the LPB-1.
See Figure 2 in our Guitar Pedal Footswitch and Jack Wiring article for the recommended footswitch and I/O wiring.
Figure 2: LPB-1 Schematic
Parts List
| Value | Qty | SKU | Type |
|---|---|---|---|
Capacitors | |||
| 100 nF | 2 | C-MKT-D1-400 | Film cap |
| 100 µF | 1 | C-ET100-100-MOD | Electrolytic |
Potentiometers | |||
| 100k Audio | 1 | R-VAM100KA-SS | Volume Control |
Resistors | |||
| 100 kΩ | 1 | R-I100K | Carbon Comp Resistor |
| 10 kΩ | 1 | R-I10K | Carbon Comp Resistor |
| 1 MΩ | 2 | R-J1M | Carbon Comp Resistor |
| 390R | 1 | R-I390 | Carbon Comp Resistor |
Semiconductors | |||
| 2N5088 | 1 | P-Q2N5088 | Silicon transistor |
Other Items | |||
| 2x5 | 1 | P-HTB-2X6 | Board |
| Black 1590B | 1 | P-H1590BBK | Enclosure |
| Black 3PDT | 1 | P-H501-L-BLK | Footswitch |
| Black/red LED | 1 | P-LPW-FLATBK-R | Prewired LED |
| Low Profile jack | 2 | S-H534 | In/Out jacks |
| Lumberg low profile DC jack | 1 | P-JBLB-IN-U | DC jack |
| Orange-style knob | 1 | P-K415-42 | Knob |
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