This video is the third part in a deep-dive into Electro-Harmonix Linear Power Booster pedal, the EHX LPB-1. Here we look at how the circuit can be adapted into a Treble or Bass Booster, and do a quick audio demo.
The circuit is a simple Common Emitter Amplifier with Voltage Divider Bias and Emitter Degeneration Resistor.
00:00 Introduction
00:40 Falstad Simulations
01:26 Screaming Bird Simulation
02:06 Mole Simulation
03:54 LBP-1 Circuit Frequency Response Recap
04:03 Screaming Bird Frequency Response
04:54 The Mole Frequency Response
05:36 Quick Audio Demos
05:58 Bypassed Audio
06:16 Standard Boost Audio
06:40 Bass Boost Audio
07:23 Treble Boost Audio
07:47 Audio Demo Summary
08:18 Different Bias Resistor Version
10:16 Looking at Versions on Reverb (not sponsored)
12:35 The Modern LPB-1
12:55 Modern LPB-1 Extra Component Identification
14:45 Coming up in Part 4
My notes can be found here:
www.dropbox.com/scl/fo/z4hlxd...
Coming up in Part 4 - A deep dive into the modern production version of the LPB-1 including those Ferrite Bead Filters, the extra Resistors, and the Power Filtering and Protection components.
I am no expert in electronics. I continue to consider myself a curious hobbyist who is fascinated by audio electronics. However, as I make these videos my knowledge increases massively and I hope yours does too. If you're unsure about the more technical side of things, my best advice is just to get started, mistakes and corrections (and the occasionally popped component) are how we learn.
If you found this video useful, want to correct my knowledge, or just want to know more about my DIY pedals and test gear leave a comment below.
If you'd like to support my channel and get some cool stickers, you can find my Etsy Store here and I'm currently working on two pedals kits of the the OpAmp Boost and Common Emitter Circuits, watch this space! www.etsy.com/uk/shop/MusicTec...