Highly Liquid Forum facebook twitter google plus rss feed

Go Back   Highly Liquid Forum > Current Products > MIDIWidget

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 03-05-2015, 03:54 PM
John's Avatar
John John is offline
Moderator
 
Join Date: Jan 2009
Posts: 3,007
Default MIDIWidget for MIDI-controlled circuit bending

Here's a quick video demo of the MIDIWidget, some reed relays, and Max/MSP being used to modulate circuit bends on a Casio SK-1:

http://youtu.be/qs1B_219R9s
Reply With Quote
  #2  
Old 06-04-2015, 06:38 PM
nealbeard nealbeard is offline
Junior Member
 
Join Date: Feb 2009
Posts: 26
Default Using lower resisitor with reed relays

Hi a quick question please;

I 've set up a breadboard as suggested in your video using coto 9007-05-01 reed relays to switch some circuit bends on and off.

It works great, but I wondered is it possible to use a smaller resistor in series with the LED between the 5v gate and ground?

10k makes the LED a wee bit dim...

Thanks

Reply With Quote
  #3  
Old 06-04-2015, 07:45 PM
John's Avatar
John John is offline
Moderator
 
Join Date: Jan 2009
Posts: 3,007
Default

Quote:
Originally Posted by nealbeard View Post
Hi a quick question please;

I 've set up a breadboard as suggested in your video using coto 9007-05-01 reed relays to switch some circuit bends on and off.

It works great, but I wondered is it possible to use a smaller resistor in series with the LED between the 5v gate and ground?

10k makes the LED a wee bit dim...

Thanks

Oops, that's a typo in the video. Yes, a 1k series resistor will work much better with the LEDs.

The relays draw roughly 10 mA, so you can safely draw another ~10 mA with the LED (although ~3 mA using a 1k resistor should provide plenty of brightness).

Each MIDIWidget output can source up to 24 mA.
Reply With Quote
  #4  
Old 06-05-2015, 09:17 AM
nealbeard nealbeard is offline
Junior Member
 
Join Date: Feb 2009
Posts: 26
Default

Ok– yep 1k sounds better...

Thnx!
Reply With Quote
  #5  
Old 03-21-2016, 11:44 AM
nealbeard nealbeard is offline
Junior Member
 
Join Date: Feb 2009
Posts: 26
Default

I've another couple of quick questions regarding the reed relay circuit...

The first is not directly midi-widget related, but could I use the same coto 9007-05-01 circuit to use 5v gates out from my Eurorack modular to trigger the reed relay in the same way that the Midiwidget does?

Also I noted your diagram had a diode drawn inside the 9007-05-01

On their spec sheet they call this an 'Optional Coil Suppression Diode'

Is this a protection diode to prevent spikes, or should I add that in additon to the LED?

Also most Reed Relay diagrams I've found seem to use transistors. I wndered why this wasn't necessary for the Midiwidget.

Thanks!

PS still haven't finished the build using all 24 gates, mainly because I have been using the 8x MidiWidgetGate stripboard have finished SO much! I use it in just about every patch I make on my Eurorack now for clocks and gates... It's FAB! thank you for another amazing design. So simple to use, and so USEFUL!

Last edited by nealbeard; 03-22-2016 at 06:36 PM.
Reply With Quote
  #6  
Old 03-23-2016, 10:51 AM
nealbeard nealbeard is offline
Junior Member
 
Join Date: Feb 2009
Posts: 26
Default

After an email to COTO I can confirm that what they call a 'Optional Coil Suppression Diode' is indeed a protection diode to prevent spikes. Which is something all of you probably knew already, but hey, it pays to be careful right?!

Quote:
Dear Neal,

Thanks for your inquiry.
Please have a look at our datasheet 9007-05-01 page 2.
As you can see the diode cathode is connected with pin# 2 +5V and the diode anode is connected with pin# 3 GND.
After coil de-energization the coil generates a voltage spike which is discharged via the diode.
Please check the distribution stock material via: http://dilp.netcomponents.com/coto.html

Let me know if you need further help.
Have a great day!

Best Regards / Mit freundlichen Gruessen
Ulrich Ehemann
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 02:09 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.