Tag: john hollis
Flatline v2 Build
The Flatline is a a great simple compressor designed by John Hollis. Check out my original article on Flatline for some background. This is an update to the original board that incorporates some mods by Atomium Amps. Besides me part value changes, this board adds a trim pot to set the release /decay time for […]
This is the Flatline compress by John Hollis with some mods by Atomium Amplification. I’ve built a few of these and they all work well. Flatline is a simple optical compressor built from a handful of easy to find parts. If you like compressors, want to build one yourself try this, you’ll probably like it. […]
Titan Boost 2
Here’s another Titan Boost. This is a John Hollis project, you can read more about it here. In a nutshell, it’s a clean boost with an output signal up to 30v peak to peak! That’s a big boost! The circuit is simple, easy to build, and runs on 9 volts without a charge pump. It works by […]
The first version of my Flatline PCB worked well but had a couple of small problems. Check out my original post for more information about the Flatline Compressor. I fixed the issues with the original PCB, and had some boards made through PCBWay.com. The cost is only $5 for 10 boards, so it’s perfect for prototyping. The first […]
Flat Line by John Hollis
The Flatline is a compressor with a simple effective design. It works surprisingly well for its simplicity. I’ve built a few of these over the years on strip board. This time I decided to make my own printed circuit boards. Who is John Hollis? John Hollis was an early contributor to the DIY Pedal scene. […]
Titan boost analysis
Here is a closer look at the Titan Boost by John Hollis. The circuit uses an op-amp to boost and buffer the input signal. This is fed into an inductor that steps up the voltage at the output. The amplifier is built around a TL072 dual op-amp IC1_A and IC1_B. The first stage, IC1_A, is […]
Titan Boost build
Here is a build of John Hollis’ Titan Boost. I built this a long time ago and liked the sound. There is also a mod to turn it into an octave up. John Hollis was involved with the early DIYStompbox community. He posted some amazing and original designs on his site. The site seems to have been […]
New PCB day!
I have a few new PCB projects in the mail today. Flatline Compressor by John Hollis Titan Boost by John Hollis Tremolo-matic XXVIII from Stompboxology Distort-o-matic XI from Stompboxology Bobtavia by Bob Starr John Hollis John Hollis was one of the first people I ran into posting DIY designs on the internet. All of his […]
Titan Boost/Octave exploded
John Hollis Titan Boost/octave. It’s all built on a single pcb that includes all of the default wiring for the switches and jacks. The rest of the pcb is perf board.
I built this some years ago, and lost the ages on my blog so I thought I’d repost them. This was a idea posted by John Hollis, whatever happened to him?
I had wanted build a compressor for a while now. But had never actually gotten around to actually making one. A few months ago I etched and soldered a a Saffron Squeeze, which is a Ross clone. Somehow I had not actually finished this before I found stripboard layout for John Hollis’ Flatline, which jumped […]
This is design by John Hollis. It’s a booster that uses an inductor to generate a massive boost. It also has a switchable octave up. The boost sound is very warm and clear. The octave has a nice tone also. There is a drop in volume between the octave and the boost, since the octave […]