Running Autodesk EAGLE 9.6.2 on Xubuntu 22.04 abram, November 9, 2022November 17, 2022 So, I did a fresh install of Xubuntu 22.04 on a Dell Latitude 7390 with an Intel UHD 620 display adapter. I had some issues with the machine locking up just a few minutes after startup. I was able to resolve this by adding the following kernel option to the… Continue Reading
Portable 40m Direct-conversion Transceiver Design abram, August 11, 2021August 11, 2021 Having finished my master’s degree over a year ago now, I’ve started to see my thesis show up on various academic web sites. I decided I should probably link it on this site in the event that anyone is interested in building and/or designing their own QRP mono-band radio. Additionally,… Continue Reading
DOD FX55B SupraDistortion – BigBuff Mod abram, September 16, 2014August 9, 2019 Here’s another in a line now of DOD pedal mods. For this FX55B, I decided to go for more of a BigMuff sound. Playing around with this pedal initially, I found it to be like most mass-produced distortion/fuzz effects. It had a very thin sound and that notorious volume drop… Continue Reading
Class AB amplifier test abram, September 12, 2014September 12, 2014 this was an attempt at designing a simple transformer-less class AB amplifier using two BJT power transistors. i setup the USB fan to protect against thermal runaway and cool off the transistors during operation. it took me looking over several schematics to realize that the the emitters of both the… Continue Reading
initial PCB milling test… abram, August 31, 2014 here’s an initial PCB test for the Triode tube overdrive on the SMBA site. this picture is pre-sanding. it was milled using LinuxCNC on a Xubuntu 14.04 LTS running the Xenomai-2.6.2.1 kernel version 3.5.7. it’s taken some time to get the configuration working and compiled since i didn’t want to… Continue Reading
work in progress abram, December 3, 2012 early stages of a reverb effect pedal for guitar. Continue Reading
SCHEMATIC: TL082 9V Active EQ… abram, March 7, 2012March 7, 2012 an experimental EQ circuit based of the TL082 datasheet. i modified it to use a 9V battery, but could probably still use some work in terms of efficiency… as most things. nothing is ever finished really. the mid portion has a pretty high quiescence. fine tuning, of course, can be… Continue Reading
Bending notes with PT2399… abram, November 28, 2010November 28, 2010 i’ve been experimenting with this PT2399 chip and using various schematics to create a digital delay circuit. the delay time seems to be directly attached to the sample rate since lengthening the delay time gives a nice decrease in pitch. i’m toying with the idea of dropping a time constant… Continue Reading
LightBox prototype abram, November 3, 2010November 3, 2010 here’s a small battery-powered guitar amp that i’ve constructed from reused parts. the housing is a busted computer power supply (some of which is in the No. 5) as well. i’ve got several options for this little fellow in mind, but, for now, it’s a tiny amp with a mean… Continue Reading
Boss Tremolo TR-2 w/ C4 Mod +Gain Boost abram, July 15, 2010August 26, 2016 This little guy is currently on eBay. I always thought that this tremolo wasn’t bad, but the volume drop was insatiable and drove me nuts sometimes. I thought I would try modding this one by cutting out the C4 cap (a 0.1uF bypass cap) which is the alleged cause of… Continue Reading