LPB-1 - Linear Power Booster

About as classic as they come, the LPB-1 is permanently attached to many guitarists pedal boards. It's a simple one transistor circuit and a perfect first build for any aspiring stompbox builder. We have two verified layouts, both with on board pot. One layout has an on board led and the other one is without.

Schematic

It might be worth noting that both layouts presented here differ from this schematic in that they include a pull down resistor on the input.

Layout and Transfer Without Led

Transfer image is 300 dpi.

Red, black - Power.
Green - Input.
Orange - Output.

Layout and Transfer With On Board Led

Transfer image is 300 dpi.

Wire connections same as the layout without led, you'll also need to connect the free pad below the led to your switch. You can also connect your switch to ground via the pad below the output wire. This makes all cables going to the switch nicely grouped together. The image above shows the suggested way to mount pot and led on board.

Components

Resistors

Value	Count
390R	1
100k	1
1M	2
10k	1

Capacitors

Value	Count
100nF	2

Transistor

The LPB-1 is pretty insensitive about which transistor to use, I've used a 2N5088 and 2N5089. Most bipolar transistors will work, just mind the pin out of the transistor you choose.

Other Parts

If you build the version with on board led, or mount one another way, you'll need a led and a suiting resistor for that led.