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Bias monitor display
Bias monitor display
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Old 24th June 2020, 09:51 PM   #1
astouffer is offline astouffer  United States
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Default Bias monitor display

Think I'm going to integrate this little display into my next project to monitor the current for each of the output tubes. It's Arduino based (of course) and plan to add some relays for overcurrent protection. The board will have the sense resistors so you just have to run a wire to each cathode and then one ground. Power will come from a small isolated DC/DC converter so no worries about voltage level issues. Maybe use a few jumpers to set the overcurrent limit.

Now I can already tell that some monocles have fallen from peoples faces at the thought of a microprocessor being near their tube amp

Is there any interest? I don't have a pcb layout yet as I'm still working on the details.
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Old 25th June 2020, 01:38 AM   #2
audiowize is offline audiowize  United States
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It kind of reminds me of the SI tube that Pete Millett used to sell.
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Old 25th June 2020, 10:56 AM   #3
gideon1990 is offline gideon1990  Netherlands
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Throw some memory in and monitor your tubes over time, logging the average per hour is probably enough to catch them going out of spec
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Old 25th June 2020, 11:14 AM   #4
kodabmx is offline kodabmx  Canada
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Bias monitor display
Very cool man
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Old 25th June 2020, 02:47 PM   #5
gerrittube is offline gerrittube  Netherlands
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I like the idea. I would like to see all voltages as well for all internal supplies and stages.
Of course I can do this without a CPU too, with manual swiching.

Regards, Gerrit
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Old 25th June 2020, 02:47 PM   #6
Deke609 is offline Deke609  Canada
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Bias monitor display
Quote:
Originally Posted by astouffer View Post
Is there any interest?
I'm interested, but I don't have anything to contribute. My experience to date with Arduino is limited to figuring out how to get my Arduino to speak to my LCD display, and uploading someone else's sketch for a milli-ohm meter (with the author's permission). But very interested in following your project.

I see big potential for using Arduino for monitoring numerous operating conditions - voltage, current, temperature, etc.

cheers, Derek
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Old 25th June 2020, 02:48 PM   #7
gerrittube is offline gerrittube  Netherlands
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Yes, temperatures too!

Regards, Gerrit
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Old 25th June 2020, 03:21 PM   #8
astouffer is offline astouffer  United States
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Reading more analog channels would require a second ADC chip. Two of the six pins are used to drive the display leaving me four. I already thought about monitoring b+
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Old 25th June 2020, 03:35 PM   #9
gerrittube is offline gerrittube  Netherlands
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B+, negative rail(s), 12 Volt, 5 Volt, unregulated input, regulated output.

I will have 600 VDC, -50 VDC, 12 VDC, 5 VDC, 450VDC, 400 VDC for example.

Regards, Gerrit
 

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