Afterlife2020
FX TYPE: Compressor
Based on the John Hollis Flatline
Enclosure Size: 1590A
“Softie” compatibility: none
©
2020
Overview
The Afterlife compressor is based on the John Hollis Flatline. It is a low-parts count, optical
compressor that will add excellent sustain and compression to your guitar tone. A simple op-amp gain
stage at the signal input sets the compression amount. The dynamic level of the input is processed
through IC1B where the signal is then rectified to drive an LED. The LED is the “engine” that drives
the photocell in parallel with R3 which dynamically changes the overall gain of IC1A. The end result
is that your guitar signal is compressed so that the overall dynamic level is evened out, thus creating
sustain. The release of the compression is determined by the value of C3.
Controls
• VOL -
Total Output.
• SUS -
Compression level.
More info about the John Hollis circuits:
http://www.hollis.co.uk/john/circuits.html
Terms of Use:
You are free to use purchased
Afterlife2020
circuit boards for both DIY and small commercial operations. You may not
offer
Afterlife2020
PCBs for resale or as part of a “kit” in a commercial fashion. Peer to peer re-sale is fine, though.
Technical assistance
for your build(s) is available via the
. Please go there rather than emailing me for
assistance on builds. This is because (1) I’m not always available to respond via email in a timely and continuous manner, and (2)
posting technical problems and solutions in the forum creates a record from which other members may benefit.