2011 Build Pictures

adamon · Posted: Wed Jan 05, 2011 2:59 pm Post subject: 2011 Build Pictures

Finally built another module for my system yesterday: its a quad analog switch with a few bells and whistles (center module in the pic).

It's basically a break-out of a 4066 paired with a 40106. The inputs/outputs of the four switches are the black jacks. Each control gate (red jack) is either fed directly to the switch, or is inverted first (via the 40106 chosen by the first column of switches on the left). The three lower control gates can all be chained to the control jack directly above each one (second column of switches), allowing for multiple switches to be controlled by a single input. The LEDs indicate when a gate is triggered.

There are a lot of cool combinations possible when chaining the control gates: if you run a single input into two inputs, make the two switches share the same control signal but invert one, you get a SPDT (a signal router basically). If you double this, you can get a DPDT. There's all sorts of other combos as well. It pairs very nicely with a gate sequencer as well (becomes a sequential switch basically).

There's also an extra hole drilled near the bottom for good measure (honestly... I didn't mess up... really...). Its like eating black-eyed peas for new years... right?

Looking forward to seeing what others build this year; last year's progress was truly amazing! Here's to a new year of building!

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Quad analog switch

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frantik · Posted: Fri Jan 07, 2011 8:51 pm Post subject:

well here's my pacman synth, my first synth build. finished last night, well.. it's almost done.. need to decide on the power source.. probably will be a 9v battery clip but also might go with the 4 AA battery pack since i have rechargeable batteries.. and/or i might add an external power supply jack. The synth runs on 3 555 oscillators (well 1 555 and 1 556) and can be configured in various ways including the Atari Punk Console

audio: http://soundcloud.com/trikome/pacman-synth

pics:
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layout of the RCA jacks:

Red - Osc 1
White - Osc 2/LFO
Yellow - Monostable Osc/Atari Punk Console

Top - Out
Bottom - CV for Osc 1 & 2, Trigger for APC

haxster · Posted: Sat Jan 08, 2011 12:07 am Post subject:

What kind of pots are those on the pacman synth?

frantik · Posted: Sat Jan 08, 2011 2:49 am Post subject:

they're 1meg but i dont know anything else about them.. found them in a bin at a surplus store

inlifeindeath · Joined: Apr 02, 2010 Posts: 316 Location: Albuquerque, NM

i'd definately go with the 9v. i've not had good sucess with the 555/556 chips at anything under that and 4 x AA's would bring you to 6v.

frantik · Posted: Sat Jan 08, 2011 12:04 pm Post subject:

well i have rechargables so i's actually 4.8v but it currently works fine using the 4 AA battery pack (the recording i posted used it)

diablojoy · Posted: Sun Jan 09, 2011 12:14 am Post subject:

1 octave pedal board
salvaged from a home organ i got for free and then rehoused in some nice timber with a mfos single buss keyboard controller cct
timbers are figured maple , blackwood , jarrah and some cocobolo
finally completely finished something Laughing

took a while

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davemoog · Joined: Feb 23, 2008 Posts: 52 Location: Vancouver

wow! beautiful work there.

inlifeindeath · Joined: Apr 02, 2010 Posts: 316 Location: Albuquerque, NM

thats a work of art dude, awesome work!

Juno60 · Joined: Feb 09, 2006 Posts: 27 Location: Germany

Here's what I've finished during the last year before I had to break my DIY for we're havin' a baby next month...

Most circuits are taken from Ray Wilsons WP20 Synth. Smile

The VCO and the WP-20 VCF are build on stripboard. The second VCF is an EFM Korg Delta Style VCF. All modules are working fine. The case isn't pretty, but it will get a better case later on.

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fonik · Posted: Wed Jan 12, 2011 12:34 pm Post subject:

Boogdish · Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN

First three panels of the new cabinet are done.
1.A pair of splitters and the power switch/fuse/pilot lamp
2.Steiner VCF
3.Two Rene Schmitz VCAs.

I'm gonna get so good at engraving by the time I fill this cabinet.
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emdot_ambient · Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD

Well...OK, it's not actually built yet...but it looks like it!

Finally got my first real synth panel in yesterday and stayed up til like 1:00AM installing the hardware (some of it temporary, as I didn't pay attention to pot values, just wanted to see what it would really look like, make sure all the drill holes were correct and that I didn't accidentally place some components too close to the mounting rails...it all tested out fine).

Now all I have to do is make the PCB mounting brackets, finish the last niggling circuit corrections, calibration, testing, bug fixing...oh...and of course ALL the wiring Crying or Very sad

...my camera is a piece of sh!t...

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Front view

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In its case

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TekniK · Joined: Aug 10, 2008 Posts: 1059

rosch · Joined: Oct 03, 2009 Posts: 164 Location: germany

very good looking indeed.
but diablojoy, that's a beauty!

bubzy · Posted: Sun Jan 16, 2011 1:44 am Post subject:

Mostly finished, modules are (left to right)

Mfos multi noise /random gate generator
mfos single chip sample and hold
thomas henry icl8038 vco
steiner synthacon filter (from the japanese guys pcb layout)
ken stones cynare cgs 47
mfos ultra simple mono mixer
belcat delay pedal (mounted onto a panel)
hip bass drum (from this forum.... sounds EXCELLENT)

still have psu to build and a little tweaking on some modules but overall its a nice rack to play with (if you'll excuse the innuendo)

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PHOBoS · Last edited by PHOBoS on Mon Jan 17, 2011 8:54 am; edited 1 time in total

I wanted to make a simple analog sequencer for testing purposes, but as
usual I couldn't stop myself from adding a couple more things.
It has a (binary) pattern generator, a sort of glide control, a VCO
and a filter. The buttons on the left are for step control and reset, the
connectors on the right are from top to bottom:
12V DC in, ext. CLK in, int. CLK out, CV out (sequencer), CV in (VCO),
Audio Out (VCO)

Build on blue perf as a tribute to Dave's amazing blue modular bigsmurf

(that 1 octave pedal board by diablojoy looks amazing, I really like the
molten plastic/organic look)

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inlifeindeath · Joined: Apr 02, 2010 Posts: 316 Location: Albuquerque, NM

very cool sequencer! what are the DIP switches for? and could you explain the binary pattern generator a little bit? thanks!

PHOBoS

-minus- · Joined: Oct 26, 2008 Posts: 787 Audio files: 13

Skrog Productions · Posted: Mon Jan 17, 2011 10:19 am Post subject:

Thank you Phobos , that's a cool sequencer / osc / filter combo , and i love the blue colour Smile

.

Dave.
(builder of blue modular).
Very Happy

Skrog Productions · Posted: Mon Jan 17, 2011 10:26 am Post subject:

kkissinger · Posted: Mon Jan 17, 2011 4:08 pm Post subject: A new Yusynth Diode Ladder Filter

This filter is a clone of the VCS3 filter. The resonant response sounds gritty or bubbly depending on the setting of the resonance level and the input signal level.

This filter was fun to build and adds another 'flavor' to the synthesizer.

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The front panel of my Yusynth Diode Ladder (VCS3 filter clone) filter with two additional audio inputs.

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View of the PCB. I've switched to color-coded ribbon cable. You can see the four capacitors of the ladder on the right-top section of the PCB. The diodes surround the caps however they are so tiny that they don't show up that well in the photo.

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PHOBoS

kkissinger

This module came to life and required no troubleshooting (**hurray!!**). I just calibrated it and that was that.

As all the other Yusynth filters that I've built, the Transistor Ladder filter is clean and musical.

Yves designed the filter to be a minimoog filter clone and its rolloff -- 24db/8ve -- is noticeably more pronounced than my Aries Multimode filters (which are 12db/8ve).

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The front panel. The Yusynth design call for two inputs and I went ahead and added two additional inputs.

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My youngest son, Matthew (who goes by the nickname "Tom") is holding the Transistor Ladder filter to reveal its PCB and wiring.

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