notes to self

Tag: delay

  • initial test of a modulated PT2399 circuit…

    a breadboard version of some PT2399 modifications i’ve been working on. there are a lot of DIY schematics that utilize the PT2399 (Magnus Modulus, Echo Base delay, Rebote, etc.). i’ve been interested at trying my hand at modulation techniques recently. i made a simple LFO circuit based on the findings mentioned in a previous post.…

  • PT2399 build…

    this is an older build now, but i wanted to post it while i’ve been on the subject to record the process. believe it or not, i still have some work to do on this one. i used a TL082 as a buffer for the mixing circuit. getting the gain set to my taste has…

  • the Stirgiform PT2399 delay…

    two days worth of soldering and layout. it’s a combination of the Magnus Modulus and Rebote delay schematics. i couldn’t get the mixing circuit to really work from the Rebote schematic (an older version) without some serious distortion, so i just kind of reworked it on my own. here’s the schematic. i wouldn’t commit to…

  • Arduino: second verse, same as first… sort of

    well, not really. feeble attempt and making some sort of microprocessor controlled tempo clock, but a good exercise in the ATMEGA328s finicky behavior. don’t ask me what that squeal is. i think it comes from the way the input was wired up (mistaking the second sleeve as a synonym for ground) coupled with the PWM…

  • 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.

  • 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…

  • Bending notes with PT2399…

    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 in around the controlling delay…