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2016 Builds!
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LFLab



Joined: Dec 17, 2009
Posts: 497
Location: Rosmalen, Netherlands

PostPosted: Sat Feb 20, 2016 6:45 am    Post subject: Reply with quote  Mark this post and the followings unread

+1 great panels.
On laserprinters, i have a samsung ml1640, and that was 65 euro new, a couple of years ago.
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kkissinger



Joined: Mar 28, 2006
Posts: 1354
Location: Kansas City, Mo USA
Audio files: 42

PostPosted: Fri Feb 26, 2016 7:44 am    Post subject: Enhanced foot controllers Reply with quote  Mark this post and the followings unread

I just finished a redo of my foot controllers.

When I first built the controllers (back in the late 1970s) they were passive circuits. Each controller has a corresponding switch to select an upper or lower threshold (more on this later). The result was not so good because the switches were not isolated from each other and if all the switches were not in the same position the pedals didn't work correctly.

The solution was to create active circuitry.

For each pedal, there is a corresponding signal path -- just an op-amp inverter pair connected in series. The input signal is inverted then sent to the next inverter. The foot-pedal, which uses a light source and cadmium cell, is configured as a shunt to ground from the input bus of the second inverter. This isolates the shunting action from the input and output jacks and isolates the switches, pots, and pedals from each other.

The threshold switches control the shunt: For the "upper" threshold, the (panel mounted pot) is connected in parallel with the pedal -- in the "lower" position, the pot is connected in series with it. Note that the cadmium cells are at their minimum resistance when the pedals are in the "back" (soft) position.

As a result, when the threshold switch is in the "upper" position, the pot controls the "loudness". When the threshold switch is in the "lower" position, the pot controls the "softness" -- that is, how much the signal will be attenuated.

The circuit works for both audio and control voltages.


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These are the corresponding front panel controls (not shown are the four pairs of input/output jacks) from the existing panel that I built back in the 1970s.
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P2260009.jpg
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A look at the installed PCB. This board contains two TL074 (quad) op-amps. Thus, this board provides eight inverters.
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P2260008.jpg
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The foot pedals. A friend of mine helped me build these back in the 1970s. Attached to each pedal is a lightbulb -- when one moves the pedal, the light swings in front of a stationary cadmium cell. This system prevents any problems from scratchy pots a
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Close up of one of the cadmium cell/light source pairs. The light source's holder is connected to the back of the pedal.
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Sat Mar 05, 2016 5:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Lovely footpedals Kevin, if I was a spider I'd crawl in there Very Happy

I built a WaveWiper module from my fresh batch of PCBs and Front Panels.

Posted Image, might have been reduced in size. Click Image to view fullscreen.
more info here

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isak



Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18

PostPosted: Sat Mar 12, 2016 3:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi guys.

I build studio passive volume controls with monitors control.
Usually i build 3 in and 3 outs till one day i got this cool order from someone that haves 6 pares of studio monitors and he wanted a passive unit with volume to control them all.
So i did Smile


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sduck



Joined: Dec 16, 2007
Posts: 459
Location: Nashville
Audio files: 5

PostPosted: Tue Mar 15, 2016 1:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Finished up this one -

Posted Image, might have been reduced in size. Click Image to view fullscreen.Jurgen Haible - Random*Source Living VCOs front by Stephen Drake, on Flickr

Posted Image, might have been reduced in size. Click Image to view fullscreen.Jurgen Haible - Random*Source Living VCOs back by Stephen Drake, on Flickr
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elmegil



Joined: Mar 20, 2012
Posts: 2177
Location: Chicago
Audio files: 16

PostPosted: Wed Mar 16, 2016 6:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Not as beautiful as sduck's, but...

(also have a Haible design very close to being done, so that will come along soon)


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LFLab



Joined: Dec 17, 2009
Posts: 497
Location: Rosmalen, Netherlands

PostPosted: Thu Mar 17, 2016 3:01 am    Post subject: Reply with quote  Mark this post and the followings unread

That's nice! I did a PCB for the 5-pulser as well, and built it recently. It is a lot of fun, run audio through it or an LFO for weird rhythms.
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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Thu Mar 17, 2016 4:26 am    Post subject: Reply with quote  Mark this post and the followings unread

All these nice boards and frontplates, I am hesitant to show my "prototypes"... Rolling Eyes
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elmegil



Joined: Mar 20, 2012
Posts: 2177
Location: Chicago
Audio files: 16

PostPosted: Thu Mar 17, 2016 5:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Let me help remove that concern Smile

I recently got a Wiard JAG, but I don't have an actual joystick module. I *do* have a couple of joysticks that have been meant to be made into modules. So I threw this together on an old home-made panel that I replaced with an FPE version....

Obviously no longer an E340 Smile


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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Thu Mar 17, 2016 5:21 am    Post subject: Reply with quote  Mark this post and the followings unread

It worked! It looks terrible Laughing Laughing Laughing
One question though: How are the connectors you use called? (and then especially the one on the bottom?)
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elmegil



Joined: Mar 20, 2012
Posts: 2177
Location: Chicago
Audio files: 16

PostPosted: Thu Mar 17, 2016 7:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Those are MTA-100 headers, and I use the crimp style sockets (I crimp the pins onto the wire and then solder them, and then insert them into the shroud).

Even the one that's not connected at the bottom is an MTA-100, they are just different sizes (3 position vs 5 position). I use the 5 pin ones for power connection when I'm using stripboard and small protoboards, since you can't get the standard MOTM power header (MTA-156) into the holes....
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Grumble



Joined: Nov 23, 2015
Posts: 1294
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Audio files: 30

PostPosted: Thu Mar 17, 2016 8:16 am    Post subject:   Reply with quote  Mark this post and the followings unread

Thanks!
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Thu Mar 17, 2016 8:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Grumble wrote:
All these nice boards and frontplates, I am hesitant to show my "prototypes"... Rolling Eyes

it is not a contest, there are no winners or losers, it is just to show what you built which can be an inspiration for others. Cool
And of course how much money you are willing and able to spend can make a big difference in how something looks.
Profesionally fabricated boards and fronts often just look, well.. more professional than DIY ones. That doesn't
mean they are better. On the contrary, I personally love to see some creative designs.

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elmegil



Joined: Mar 20, 2012
Posts: 2177
Location: Chicago
Audio files: 16

PostPosted: Thu Mar 17, 2016 9:04 am    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
it is not a contest, there are no winners or losers, it is just to show what you built which can be an inspiration for others. Cool
And of course how much money you are willing and able to spend can make a big difference in how something looks.
Profesionally fabricated boards and fronts often just look, well.. more professional than DIY ones. That doesn't
mean they are better. On the contrary, I personally love to see some creative designs.


well done
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elmegil



Joined: Mar 20, 2012
Posts: 2177
Location: Chicago
Audio files: 16

PostPosted: Thu Mar 17, 2016 9:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Current measuring jig. A couple of 0 - 3A Ammeters, and some creative stripboarding to create shunts. I can measure any type of power connector that I commonly use (MOTM measured with an MOTM to 5 pin power cable).

Dual Mirror Core VCO in the jig for demonstration purposes, one of the main reasons I wanted to built the jig actually, because I knew its draw was high but I wanted to know how high Smile


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rhdf



Joined: Jul 11, 2014
Posts: 39
Location: Sweden

PostPosted: Sat Mar 19, 2016 5:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Dual SVF + VCA and digital routing. (or rather 1,5 missng some parts for second filter)
The 3 Ic:s top left is the ones killed in the making so far.

a 4052 where I accidental shorted pin 6 (inh) to pin 7 (VEE) obviously a bad idea. That also killed the poor 75HC595 controlling it. The third is a 13700 that died of unclear reasons.


The rest is just some Input/output boards and buttons/encoders setups to control it (and a netduino for quick hacking).
The perfboard on top of the breadboard is just a.. perfboard-copy of whats on the breadbord, except the dac


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elmegil



Joined: Mar 20, 2012
Posts: 2177
Location: Chicago
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PostPosted: Sat Mar 19, 2016 7:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have a whole bunch of stuff at the edge of the hopper, just needing panels. This one I was lucky enough to be able to get a bridechamber panel for, so it's a tiny bit less work and therefore higher in the queue Smile


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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sun Mar 20, 2016 12:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

My next build is a quad generator made with an Arduino with 4x AD9833 DDS, not oscillators, because the waveform is generated as opposed to the result of oscillations.
All 4 AD9833 are capable of putting out sine, triangle or square wave, not simultaneous though, but I have made 4 simple discriminators to convert the sine or triangle wave into a square wave with variable pulse-width.
So now I have 4 sine or triangle waves (selectable with switches) and 4 pulses.
The 4 switches on the left choose between midi and free, when in free mode the generators act as if middle A is pressed.


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AlanP



Joined: Mar 11, 2014
Posts: 746
Location: New Zealand
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PostPosted: Sun Mar 20, 2016 10:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Verra nice perf job! Smile
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Grumble



Joined: Nov 23, 2015
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PostPosted: Mon Mar 21, 2016 12:13 am    Post subject: Reply with quote  Mark this post and the followings unread

thnx Laughing
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Grumble



Joined: Nov 23, 2015
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Location: Netherlands
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PostPosted: Wed Mar 23, 2016 12:23 am    Post subject: Reply with quote  Mark this post and the followings unread

A Quad Voltage Controlled Attenuator.
When there is analog circuitry involved, it always tends to get messy Embarassed


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elmegil



Joined: Mar 20, 2012
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Location: Chicago
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PostPosted: Thu Mar 24, 2016 10:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have a big list of builds that have been languishing for ages. All of them waiting on panels.

I made 6 panels this week, so I'm going to look like I'm mega fast; reality is I'm reasonably fast at panelling once I sit down and do it. Builds have been done for months in some cases.

This one is not my best panel finish, had a mishap after spraying it with clear coat. Since it's for me, it's not worth the time and material to do it over....


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helge-h



Joined: Jun 17, 2014
Posts: 24
Location: Norway
Audio files: 2

PostPosted: Sat Mar 26, 2016 9:07 am    Post subject: Multiple Reply with quote  Mark this post and the followings unread

Made a couple of loose multiples from some pill boxes. Very useful, and they don't take up precious panel space. Who needs bananas?

Helge


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micromusic



Joined: May 05, 2014
Posts: 61
Location: england

PostPosted: Sat Mar 26, 2016 11:42 am    Post subject: Reply with quote  Mark this post and the followings unread

My project so far Digisound and Yusynth still growing!!![/img]


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richardc64



Joined: Jun 01, 2006
Posts: 679
Location: NYC
Audio files: 26

PostPosted: Sun Mar 27, 2016 8:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Great looking and some extensive projects from our multi-skilled and creatively-minded members. In comparison my progress for 2016 has been small, starting with

1] One of the smallest assemblies I've ever made. 1/8" TRS jack, trimpot & npn transistor. (I'm still not ready for surface mount, though.) Purpose is to adjust the sensitivity of an expression pedal (actually a rewired sewing machine speed control) to function as an Off/On HiHat Open/Close switch.

2] A box for a project I hope to complete in time to BE a 2016 build. (Doesn't seem likely at this point.)


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