Author Topic: Syntherrupter - A Feature-rich, Polyphonic Interrupter  (Read 18934 times)

Offline futurist

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Re: Syntherrupter - A Feature-rich, Polyphonic Interrupter
« Reply #160 on: June 06, 2021, 11:18:46 AM »
Looks nice! I like the idea of having switches to physically turn off outputs, maybe even add one master switch for all outputs?
Is the board designed to fit in particular enclosure?

Offline Max

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Re: Syntherrupter - A Feature-rich, Polyphonic Interrupter
« Reply #161 on: June 06, 2021, 03:01:44 PM »
Thanks! Good idea with the emergency switch. I also added the missing infos on the silkscreen. This layout is btw not suited for self-manufacturing since a couple holes need to be plated. If there's interest in such a version, I can try to make one.

No, it's not made for a particular enclosure. I designed the PCB "as compact as possible" and the next biggest size was 100x160mm which is a very common size (eurocard). Thus there should be many different enclosures available.

Kind regards,
Max

Offline Mads Barnkob

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Re: Syntherrupter - A Feature-rich, Polyphonic Interrupter
« Reply #162 on: June 06, 2021, 08:41:31 PM »
I like the idea of making it a PCB that the Tivo plugs into, I did not think of that!

I think some of your resistor values will need tweaking when running on 5V, I had to change some of my initial design as it was too high values for my LEDs, but yeah that differs from build to build what parts are used and how bright you want something to be that sits in a dark room.

You could add a row of pin headers for external interrupters and a DIP switch row to select which is used, might not be for everyone, but I am making that on my build. Since optical outputs are money, might as well make them useful in more ways :)

My final exam was Friday two days ago, im done with studying next work, which I have been doing for 3 years, so I can finally pick up on my DRSSTC show controller again :) https://highvoltageforum.net/index.php?topic=1417.0
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
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Offline Max

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Re: Syntherrupter - A Feature-rich, Polyphonic Interrupter
« Reply #163 on: June 07, 2021, 12:12:07 AM »
I can see how having the option of an external interrupter could be handy... However, I don't think it needs these changes. I'll add a high-impedance mode in software, turning the output pins into inputs, then you can connect your external interrupter directly to the pin header on the Tiva board itself.

Could you be a bit more specific about the resistors? Here are my calculations behind the values:
560R base resistor: Desired base current: 5mA. (3.3V_pin_high - 0.6V_base) / 5mA = 540R
68R IR transmitter: Desired LED current: 40mA (nominal current: 60mA). (5V - 1.7V_f - 0.6V_ce) / 40mA = 68R
270R LED resistor: Desired LED current: 10mA. (5V - 2V_f - 0.6V_ce) / 10mA = 240R
Actually, I could change the 270R for a 220R; getting rid of one resistor value since 220R resistors are required for the MIDI In/Out circuit anyways.

I added a pin header for a MIDI Out port which might be used in future. I also added the footprint for one of these generic SD card breakout boards.

Congrats for your exams!


Kind regards,
Max
« Last Edit: June 07, 2021, 12:17:08 AM by Max »

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Re: Syntherrupter - A Feature-rich, Polyphonic Interrupter
« Reply #163 on: June 07, 2021, 12:12:07 AM »

 


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