Friday, January 11, 2013
Tuesday, January 8, 2013
And yes, that is a 9mm shell next to the Resonance knob: I put a hole in the panel where I should not have, with a 9mm diameter. The shell just happened to lie around in the streets of Neukölln, Berlin, and it fitted perfectly. So there!
Sunday, July 4, 2010
Tuesday, June 29, 2010
The 505 is a digital drummachine made by Roland. It has a nice, easy-to-use sequencer, a big display, full MIDI capabilities and some of the most boring sounds that you'll ever hear...
Time to mod it, I'd say!
It now sports single outputs (1/4") and trigger outs (1/8"). Especially the trigger outputs are quite handy for owners of a modular synth... the 505 will work as a MIDI-to-trigger converter too!
Also the sounds are now tunable - I added 8 new oscillators (this time 40106 based, unlike the 555 based ones on my TR 707) to accomplish this.
I also added volume controls, so now there are 16 new knobs on the front panel. The volume controls are doubling as a"crunch" control, which goes like this: the maximum volume is reached at the 12 o´clock position (and the potentiometers have a center detent to reflect this), turning the knob further to the right will overdrive the internal mixer stage a bit, resulting in a slightly distorted sound. This adds a nice punch and grit! Due to the way the mixer stage is designed this will only work on the main outputs.
Most of the necessary informationon how to do these mods can be had from the Burnkit2600 TR505 page, so thanks to those guys!
All that stuff did not fit into the stock enclosure, I had to make some side cheeks out of stained plywood in order to raise the height of the case by 3cm.
Check the sound sample below for a glimpse of what this machine sounds like. No FX, no overdubs, no EQ used - recorded straight from the master output.
Monday, June 21, 2010
So here it is, my second x0xb0x. This one has been finished for ages, but only today it occured to me that pictures would be nice.
It is completely self sourced, which means that I did not buy a kit but aquired all parts separately. Likewise there is no official Adafruit serial number.
The mods are:
PWM for the square wave
Accent Sweep Speed selectable between fast, normal and slow
Accent Decay control
Filter Overdrive with "color" knob
Bass Boost, Resonance Boost (with separate pushbutton switch and LED indicator)
"Eternal Bliss" - this is a combined Gate On Forever / Envelope On Forever to get those liquid acid lines
Filter Modulation with selectable source (square, saw, VCA) and two modes (buffered / unbuffered)
Envelope Retrigger button
VCO out / Filter in on TRS socket
orange / amber 3mm LEDs
Sokk0s 1.9 operating system
Sunday, February 7, 2010
I designed the PCB and the frontpanel myself whilst the circuit is inspired by the invaluable genius that is Ken Stone.
The keen eye might wonder why there are some odd componends on the circuit board, most notably the HUGE 2W resistors. Easy: I am a sexy Recyclotron and so I used what I had on hand. That sometimes means that I pull components from junk electronics (always remember: recycle or die)
Because I am such a nice guy I wrote him a manual as well (he's stupid and I had a lazy sunday evening to waste). Now all that is left is to do is to actually send him the thing. As much as I hate to part with the module -I am sure it'll be in good hands.
Tuesday, August 18, 2009
Since he is an avid guitar player (and the other half of our Hardcore Electro Country Band Dezombiefied) I just had to give him something relating to that.
So here it is, the BENJAMUFF PI.
Check the Big Muff Museum if you still dont get it...
Monday, September 1, 2008
Upon closer examination it turned out to be a Flanger/Phaser published in the 6/82 issue of Elrad, a german electronics magazine. (I found out because the name "Elrad Music Processor" was etched on the copper side of the PCB. Yes, that was easy.)
It features DT, ADT (double tracking, automatic double tracking), Flanger and Phaser modes with different timebases, variable speed and amount. It is triggered either with a footswitch or the button on the front panel. And oh yes, it is monaural.
The pots were totally scratchy, someone had made some modifications to it (including a crude guitar preamp of sorts) and it wasnt working that well.
I decided to restore it to the point where it would be useful to me. Some fellow from the SDIY mailinglist kindly send me a printout of the original Elrad article, but it was not that readable... especially the schematics and the component overlay for the PCB foil. Therefore, I put the whole shebang away.
Time passed, legend tells that I left the country.
Fast forward: about a month ago I re-found the flanger. I knew that the whole Elrad backissues are available on DVD, so I decided to invest 20 Euros and ordered it. Three days later I had perfectly readable schematics of the unit. With those it took about an hour (!) to get a working unit. Then I quickly (within 3 days or so... paint and glue take their time) built a 19" case out of some plywood, sheet metal (used to be a case for a CD player) and a 19" blanking panel that I veneered and stained orange.
I am quite happy with the result. The unit sounds nice, looks good and, strictly speaking, didnt cost me a cent since I had everything needed in the restauration process in my parts bin anyway. I currently use it as an insert in my mixing console.