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Old 4th April 2013, 08:59 AM   #1
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Default Arduino cathode current HT etc

I have searched posts and not found anyone using an Arduino to monitor Bias, HT voltage etc. I would like to check and compare the current thru the four parallel cathode biased valves in my amp and alert me to inconsistencies. Maybe just light up a LED if one is not within the set parameters. Seems simple enough but I havent a clue about the code etc. I would love to know if anyone does!
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Old 4th April 2013, 09:53 AM   #2
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Hi,

I use an Arduino controller in my GM-70 SE amplifier.

It manages soft start, monitors instant and average cathode current and breaks the HT power transformer primary if it detects any problem.

It also controls LEDs to signal status and power clipping.

This little controller ($10) allows me to use fixed bias without fearing runaway power tubes!
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Old 4th April 2013, 04:32 PM   #3
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Quote:
Originally Posted by bullpeters View Post
I have searched posts and not found anyone using an Arduino to monitor Bias, HT voltage etc. I would like to check and compare the current thru the four parallel cathode biased valves in my amp and alert me to inconsistencies. Maybe just light up a LED if one is not within the set parameters. Seems simple enough but I havent a clue about the code etc. I would love to know if anyone does!
I use a PIC -- same difference :-)
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Old 4th April 2013, 09:08 PM   #4
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Originally Posted by peterfarrow View Post
I use a PIC -- same difference :-)
Not quite. With an arduino, you've got the admiration of the duct-tape wielding, POV loving, Maker hipsters. With a PIC you are just solving your problem without needing skinny jeans, fixie bicycles, ironic t-shirts, or pabst Blue Ribbon beer...

Sheldon
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Old 4th April 2013, 09:52 PM   #5
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Quote:
Originally Posted by stokessd View Post
Not quite. With an arduino, you've got the admiration of the duct-tape wielding, POV loving, Maker hipsters. With a PIC you are just solving your problem without needing skinny jeans, fixie bicycles, ironic t-shirts, or pabst Blue Ribbon beer...

Sheldon

I just googled fixie bicycles, if my daughter sees that I'm finished....

:-)
http://3.bp.blogspot.com/-3teRT90Ptz...fixie-bike.jpg
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Old 5th April 2013, 12:29 AM   #6
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I am not the right shape for skinny jeans and my bike is electric
Please can you at least give me some clues as how to go about this. Hall effect sensor or just measure the voltage drop across a resisitor? Will the Arduino be accurate enough alone or do i need an amplifier between? How am I going to figure out the code?
I am happy to DIY but need a clue before wadeing thru the many POV tutorials.
Much rather read something...
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Old 5th April 2013, 08:39 AM   #7
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The Arduino can directly measure a voltage between 0 and +5V, with a 10-bit precision (4.9mV resolution). That is a pretty good performance.

To measure higher voltage, you simply use a voltage divider with 1% resistors, and translate it in the code.

To measure a current, you measure the voltage drop across a small value resistor (10 ohm for example).

I will send you my code, I think it would help.
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Old 5th April 2013, 09:51 AM   #8
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Thank you so much. This all looks like gibberish but it is a starting point. Thank you very much
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Old 5th April 2013, 10:26 AM   #9
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Originally Posted by bullpeters View Post
This all looks like gibberish but it is a starting point.
OMG... and I thought my code was readable...

You have the Arduino reference online, it will help you understand.
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Old 5th April 2013, 12:55 PM   #10
TheGimp is offline TheGimp  United States
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I suspect he was not dissing your coding ability, but rather that all code looks like gibberish if you don't understand code.
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