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LFLab
Joined: Dec 17, 2009 Posts: 497 Location: Rosmalen, Netherlands
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Posted: Sat Feb 20, 2016 6:45 am Post subject:
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+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
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Posted: Fri Feb 26, 2016 7:44 am Post subject:
Enhanced foot controllers |
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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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A look at the installed PCB. This board contains two TL074 (quad) op-amps. Thus, this board provides eight inverters. |
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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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_________________ -- Kevin
http://kevinkissinger.com |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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isak
Joined: Dec 13, 2009 Posts: 847 Location: Israel
Audio files: 18
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Posted: Sat Mar 12, 2016 3:03 pm Post subject:
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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
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_________________ http://www.myspace.com/mgmtrance |
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sduck
Joined: Dec 16, 2007 Posts: 459 Location: Nashville
Audio files: 5
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
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Posted: Wed Mar 16, 2016 6:41 pm Post subject:
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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
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Posted: Thu Mar 17, 2016 3:01 am Post subject:
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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
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Posted: Thu Mar 17, 2016 4:26 am Post subject:
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All these nice boards and frontplates, I am hesitant to show my "prototypes"... |
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Thu Mar 17, 2016 5:21 am Post subject:
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It worked! It looks terrible
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
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Posted: Thu Mar 17, 2016 7:37 am Post subject:
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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 Location: Netherlands
Audio files: 30
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Posted: Thu Mar 17, 2016 8:16 am Post subject:
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Thanks! |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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Posted: Thu Mar 17, 2016 8:53 am Post subject:
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Grumble wrote: | All these nice boards and frontplates, I am hesitant to show my "prototypes"... |
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.
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. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider Twitch YouTube |
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
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Posted: Thu Mar 17, 2016 9:04 am Post subject:
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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.
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
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rhdf
Joined: Jul 11, 2014 Posts: 39 Location: Sweden
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
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Posted: Sat Mar 19, 2016 7:20 pm Post subject:
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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
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Sun Mar 20, 2016 12:45 pm Post subject:
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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
Audio files: 41
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Posted: Sun Mar 20, 2016 10:22 pm Post subject:
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Verra nice perf job! |
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Mon Mar 21, 2016 12:13 am Post subject:
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thnx |
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Wed Mar 23, 2016 12:23 am Post subject:
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A Quad Voltage Controlled Attenuator.
When there is analog circuitry involved, it always tends to get messy
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
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Posted: Thu Mar 24, 2016 10:16 pm Post subject:
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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
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micromusic
Joined: May 05, 2014 Posts: 61 Location: england
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
Audio files: 26
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Posted: Sun Mar 27, 2016 8:38 am Post subject:
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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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with temporary cardboard panel |
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_________________ Revenge is a dish best served with a fork... to the eye |
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