What is the biggest build you ever did?

[David]

my first scope;
analog 16 instruments drum machine plus rhythm-matrix plus hardware step-sequencer plus 12 drumpads hardware with env.-foll. (own design);
analog monophonic synth ("Elektor Formant");
16 channel vocoder with linear phase-response filters (own design);
...;
...;
...;

Puretube, you are crazy!  I am in constant awe of you.  What do you use for a personal computer?  A UNIVAC 2 or IBM 7070 in your basement?

[puretube]

ZX81 with souped up RAM to 64KB (on perfboard, btw.).
Instead of booting from cassette recorder, I soldered a
diode-sequencer matrix for a certain Sampler program....

[David]

ZX81 with souped up RAM to 64KB (on perfboard, btw.).
Instead of booting from cassette recorder, I soldered a
diode-sequencer matrix for a certain Sampler program....

A ZX81?  Yeah, right -- it doesn't use tubes!  Now, we can forgive this offense if you modify it to serve as the keyboard to one of the aforementioned (tube-based) mainframes.

Just kidding...  actually, you are probably one of only a handful who could pull it off...   :wink:  :wink:  :wink:

[puretube]

the ZX81 (actually 2 of them, is the one in the basement  - replaced the sh*tty foil keyboard with micro-actuators... - );

my actual machine is a PII 450MHz/128Mb with a software Atari 1040STFM emulator running on it... (19" moni...);

BTW: I mistook the vocoder: it`s only 12 channel
(sorry for boasting  :oops: ) :



actually the pix were for another thread about de-soldering and re-using:
http://img.photobucket.com/albums/v442/lectronix/voc357.jpg
all connectors, IC-sockets, pots, trimpots and caps
(measured and matched to <1% tolerance for the filter-section...)
ripped from industry-junk,
even the PCB-boards are from dumpster-diving...
http://img.photobucket.com/albums/v442/lectronix/DSC00355.jpg
http://img.photobucket.com/albums/v442/lectronix/voc352.jpg



note: every quad- or hex-module got it`s own V-reg, and an extra PCB as a groundplane...  

http://img.photobucket.com/albums/v442/lectronix/voc354.jpg

[gorohon]

A monkey!  
I wish; that'd be pretty cool.  

PAIA Fatman....phbbbbt-phbbbt-wooo-wee-woo!!!  Not bad for my second build ever.  The first was a Theremax.  Now, just teeny pedals that go boom when I try them out :lol:

[Transmogrifox]

I was thinking my present project was rather large, until you all shared your stories:

My biggest build is an envelope filter that uses an envelope follower with a 5th order averaging filter on the output of a precision rectifier, a state-variable filter (LED/LDR modulated similar to Mutron), low/hig/band -pass 3-channel mixer, oscillator with send---and return to envelope follower (auxilliary switch involved) so you can put a wah pedal or tremolo or something in the loop to modulate the filter by modulating the envelope on the oscillator output signal. Also included: a post-envelope follower loop (so you can insert distortion and stuff pre-filter, yet have the EF follow the clean signal).  The Auxiliary input to the envelope follower allows for mic/line inputs so the filter can be modulated by the vocalist or drummer, external LFO, trigger, or so.  It's basically an analog synth filter module--but not a full-on guitar synth set-up.  It's still pretty simple in  comparison, though I determined it will have about 8 or 9 pots to tweak with when I'm done.

I completed the envelope follower last night. I'm building module upon module and interconnecting them all in the end--hey, maybe it will expand into a larger project--module by module.

[puretube]

my first scope;
analog 16 instruments drum machine plus rhythm-matrix plus hardware step-sequencer plus 12 drumpads hardware with env.-foll. (own design);
analog monophonic synth ("Elektor Formant");
16 channel vocoder with linear phase-response filters (own design);
...;
...;
...;

Puretube, you are crazy!  I am in constant awe of you.  What do you use for a personal computer?  A UNIVAC 2 or IBM 7070 in your basement?

finally found the drum-machine-pix:
front (instruments & drumpad-interfaces:


back:

rhythm section:

matrix:

master osc.:

[Paul Perry (Frostwave)]

My biggest build is an envelope filter that uses an envelope follower with a 5th order averaging filter on the output of a precision rectifier, .

Transmogrifox, does the 5th order filter make a worthwhile difference or is it too early to say? Personally I find it is barely worth making the rectifier full wave!
please keep us posted! (transmogrifox.. werewolf? or cat into fox?)