notes to self

Author: abram

  • PT2399 with BJT preamp

    here’s a short clip of the delay circuit that i intend to convert to a stomp box. i’m still working out the kinks in the pre-amp stage to solidify the input signal from the guitar though. just a sample though to hear how it might sound with some guitar tones. more soon.

  • Arduino: the oBITerator

    this was a short experiment where i wanted to see how analog AC signals from a guitar were received and converted to digital signals by the ATMEGA328. to “hear” the results along with seeing the numbers as i plucked the strings, i combined digitalWrite() and the tone() functions to output on the same pin giving…

  • Eico Model 460

    Eico Model 460 Oscilloscope Test from abram on Vimeo. Eico Oscilloscope 460 Manual Thanks, Daniel.

  • Exoplanets…

    Driving around doesn’t leave much time for making circuits, so here is an interesting graph brought to you by Space.com. Source Space.com: All about our solar system, outer space and exploration

  • The Esteli: an LM386N-based cigar box amp

    The Esteli: Cigar Box instrument LM386N-based Amp from abram on Vimeo. Here’s the latest in general purpose amplifiers made from reused parts. The enclosure is an old cigar box for which i have quite an affection as an enclosure. I really do love the sound of wood in both the recording process and amplifiers. In…

  • fuzzy PT2399 on baritone guitar…

    Here’s a loose guide that I’m using to migrate the PT2399 into stomp box world. Here’s a dry run sample with a Gretsch Baritone guitar. [audio:http://abrammorphew.com/notes/wp-content/uploads/2011/06/pt2399_guitar_delay.mp3|titles=pt2399_guitar_delay]

  • Square-wave Oscillator Meets PT2399…

    Square-wave Oscillator with PT2399… from abram on Vimeo. Very short video of the waveform captured using Xoscpe of the PT2399 applied to the LM386 square-wave oscillator. Sorry for the bad focusing. I was in a rush. I just needed a visual capture for later analysis. [audio:http://abrammorphew.com/notes/wp-content/uploads/2011/06/osc_delay.mp3|titles=i just broke the gameboy] …and here’s a clip of…

  • LM386 Square-wave Oscillator

    Here’s a small LM386-based square-wave oscillator built from the following schematic. I replaced the 30k resistor with a 50k Potentiometer from my stash of parts which then, of course, acts as a pitch controller. The following audio is some track recordings made in Ableton 8.0 with a little filter on one track and some reverb…

  • First HF Transmission on 160m…

    AM transmission on 160m from K2NXF from abram on Vimeo. Here’s a little video of my first AM transmission on HF. The modulation you ask? Horrible! But what can you ask for when using an almost dead 9V battery, two BC550Cs from an old Electro-Harmonix Double Muff, and an inductor from a busted SW radio?…