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vladosh

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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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Posted: Thu Feb 14, 2013 10:37 am Post subject:
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Buchla 1110 Ring modulator ,layout by Romeo shared on this thread with more details on building and troubleshooting the original Buchla Schematics : http://www.electro-music.com/forum/post-317032.html
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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Posted: Fri Feb 15, 2013 5:55 am Post subject:
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SSM2164 Based VCA's by Mike Irwin ,schematics with comments and detailed description on the following link http://www.sdiy.org/philgallo/mgbvca.html
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
Audio files: 46
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
Audio files: 46
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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Posted: Sat Feb 16, 2013 4:10 am Post subject:
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Voltage Controled Amplifier by ACX Synth ,page dedicated to this THAT 2181 based VCA http://www.acxsynth.com/VCA/vcafr.htm ,along with bill of materials and details on construction and performance .From there the brief description :
THAT the company specializes in high-end audio circuits. Among these, there is a VCA interesting is the 2180. It requires no adjustment and provides excellent performance. The dynamic range is greater than 120 dB distortion 0.0025% (model A). This circuit is however quite expensive. For this module, I simply resume the manufacturer's datasheet. My work is limited to the design of the PCB and the design of the control system voltage.
This circuit is logarithmic response which indicates that the gain in dB is linear with respect to the input voltage.
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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Posted: Sat Feb 16, 2013 2:43 pm Post subject:
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80-11 Dual Ring Modulator by Digisound Modular ,for full documentation on this and the later version of this module using MC1496. visit http://www.digisound80.co.uk/digisound/modules/80-11/80-11.htm
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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Posted: Sun Feb 17, 2013 9:35 am Post subject:
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Paia Gator by Paia ,redrawn schematic and pcb layout by gaussmarkov visit http://gaussmarkov.net/wordpress/circuits/gator-clone/ for more on this module .
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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Posted: Sun Feb 17, 2013 10:01 am Post subject:
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ARP Quadra Phase Shifter designed by Paul DeRocco, Joe Lemansky and Tim Gillette of ARP ,modified and pcb layout by Jürgen Haible ,from the notes on Jürgen's page http://www.jhaible.de/additional_schemos.html :
In my version, as it is published here, I have replaced the differential buffer amp (which is a true piece of art in the original, using a FET pair, a BJT pair and an opamp) with an instrumentation amp made of BiFET opamps.
The compander circuit, built around a CMOS transistor array, is like in the original, and it surely contributes to the specific sound. (It's discussed on my Storm Tide Flanger page.)
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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Posted: Mon Feb 18, 2013 4:07 am Post subject:
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Real Ring Modulator and Modem by Ken Stone ,for more info on this module ,on construction ,bill of materials and pcb's visit http://www.cgs.synth.net/ from there the brief description and an idea on how to combine ring modulators as Modem :
Four quadrant multipliers have more or less replaced ring modulators in synthesizers, even though they still bear the label "ring modulator". The distortion in these is lower than that of a true diode ring modulator, because the diode voltage drops have been eliminated. This leads to better specifications, though in a noise maker, this is not always desirable.
This is something you can try if you have two Real Ring Modulators, or with a little variation, any two four quadrant multipliers.
In radio work, modulation is only the first step. Before the signal can be heard at the receiving end, it must first be demodulated. The wiring diagram below shows a simple system that more-or-less replicates this, but without all the extra gear associated with radio transmission and reception.
Basically we need to feed the same carrier into two Real Ring Modulators, the second modulator being used in reverse to demodulate the signal that was modulated in the first. In a perfect world this would result in an identical signal to what was being fed in, which of course would make the exercise pointless in a synthesizer. Fortunately, Real Rings Modulators introduce distortion, so some interesting sounds can be achieved.
When the two Real Ring Modulators are interconnected, it is possible to not use any buffer in between them, though in this case, (allowing for some variation in wiring,) you would need to connect the outputs together and take your new output from the input of the second. This effectively reverses the phase of the second carrier. Alternatively you can install a switch as shown.
As soon as a buffer or modifier (for example a filter) is added between the two modulators, the correct phase will need to be determined by experiment, as some modules will invert the signal.
visit the cgs subforum for more info http://electro-music.com/forum/forum-165.html
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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Posted: Tue Feb 19, 2013 3:10 am Post subject:
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Vactrol Panner by diablojoy as shared on this thread http://electro-music.com/forum/topic-46711.html with more details on the design as well as demo .From the comments there :
something i have been playing with this last week
vactrol type isnt fussy i am using NSL32 but could just as well be
vtl5c3, A slow closing vactrol like a vtl5c4 could be interesting also
the P2 connector goes to a B100k pot pin 2 is the wiper just reverse 1 and 3 if left / right is wrong way round . note with the pot in the centre and no cv input there is no output.or at least very little
CV input can be from an LFO output +5 to -5 volts though going to the rails will not hurt anything.
T1 and T2 adjust the sensitivity for the vactrols you can get them pretty good just by watching the panel leds PD-L / PD-R while adjusting P2 for the supplied voltage though the actual vactrol response is slightly different to normal leds so also use your ears
anyway hope someone can use this
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vladosh

Joined: Aug 02, 2010 Posts: 667 Location: macedonia
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