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How to build a 21st century protection board
How to build a 21st century protection board
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Old 5th November 2014, 10:03 PM   #11
jwilhelm is offline jwilhelm  Canada
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Yes it does. That's how I realized a had a weird issue with the Slewmaster. It seems to be working very well so far. I haven't connected the bias circuits yet. Any suggestions on resistor values for a 63 volt amp? What voltage do the opto-isolators activate at?
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Old 5th November 2014, 10:06 PM   #12
vzaichenko is offline vzaichenko  Russian Federation
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How to build a 21st century protection board
And if the offset grows really slowly, it triggers earlier - at around 1V...
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Old 5th November 2014, 10:13 PM   #13
vzaichenko is offline vzaichenko  Russian Federation
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How to build a 21st century protection board
Quote:
Originally Posted by jwilhelm View Post
Yes it does. That's how I realized a had a weird issue with the Slewmaster. It seems to be working very well so far. I haven't connected the bias circuits yet. Any suggestions on resistor values for a 63 volt amp? What voltage do the opto-isolators activate at?
In my case, I had it triggered at around 5A through the output pair (with 2 x 0.22R emitter resistors). But better test, just with some DC voltage (0.44R x 5A = 2.2V). It does not depend on the rail voltage - only depends on the voltage drop over emitter resistors.

Pls let me know if the default R values are ok at opto-pairs, or you have to adjust them... gathering statistics
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Old 5th November 2014, 10:15 PM   #14
jwilhelm is offline jwilhelm  Canada
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Will do.
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Old 6th November 2014, 01:21 AM   #15
jwilhelm is offline jwilhelm  Canada
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My bias circuit doesn't seem to be working. If D3 is high on the Arduino should the protection be active?
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Old 6th November 2014, 01:32 AM   #16
vzaichenko is offline vzaichenko  Russian Federation
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How to build a 21st century protection board
Quote:
Originally Posted by jwilhelm View Post
My bias circuit doesn't seem to be working. If D3 is high on the Arduino should the protection be active?
D3 high is initial state. As soon as the bias gets high enough, D3 goes low - that's when protection triggers. Does the level change at all?
Note the polarity - it's a LED inside HCPL chip, so it lights only in one direction.
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Old 6th November 2014, 02:00 AM   #17
jwilhelm is offline jwilhelm  Canada
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I have an open resistor in R11. It seems to operate on the other bias resistor okay. It's tripping around 2 volts but something is smelling hot on the board. I've been noticing it off and on all day. I better figure that out before I go any farther.
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Old 6th November 2014, 02:20 AM   #18
benb is offline benb  United States
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First, let me get this off my chest:

It appears that "PIC" has become a genericized name that many people use for ANY microcontroller. This can make for a lot of confusion. It just did for me in this thread, until I saw what was happening.

"PIC" is a registered trademark for a specific line of microcontrollers made by Microchip:
Microchip Technology Inc
Microchip has been making PIC microcontrollers for decades, and I can see why people might use PIC as a general term for any microcontriller, but it's still not a generic name for a microcontroller. The PIC name should only be used for MICROCHIP's microcontrollers.

The Arduino (and "Arduino compatible") boards use AVR microcontrollers made by Atmel:
http://www.,atmel.com
Atmel's AVR microcontrollers are incompatible with PIC microcontrollers (even though they may have comparable features). If you call it anything other than a microcontroller, you should call the microcontroller on an Arduino an AVR.
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Old 6th November 2014, 02:30 AM   #19
tauro0221 is offline tauro0221  United States
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Hi,
Finally I see some members using micro to protect the speakers or some functions in the amplifiers. I been using the micro to protect the speakers for about 3 years. I am using the ACS712 current sensor to read the speaker current and if it reach the set point the rails voltage will be shut down. Te sensor give you a voltage output proportional to the current. The only thing you need to do it is read the voltage output and shut down the speaker at the desire current setting. You can buy them in Ebay for different current amps. They are in a module and the only thing to do it is cut the wires from the amplifier to the speaker and install it. Simple and accurate.
I am using the micro also to control the rails +/- voltage and if the output current reached the set point it will shut down the rails voltage.

I am using the Zbasic micro controller or the Basic Micro . Lately I am started to use the Arduino because it has a nice board that allow you to do anything that you want.

I will keep reading the thread and see if I can be of any help. I have been working with micro for about 5 years.

Keep the good work.
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Old 6th November 2014, 03:06 AM   #20
jwilhelm is offline jwilhelm  Canada
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Quote:
Originally Posted by benb View Post
First, let me get this off my chest:

It appears that "PIC" has become a genericized name that many people use for ANY microcontroller. This can make for a lot of confusion. It just did for me in this thread, until I saw what was happening.

"PIC" is a registered trademark for a specific line of microcontrollers made by Microchip:
Microchip Technology Inc
Microchip has been making PIC microcontrollers for decades, and I can see why people might use PIC as a general term for any microcontriller, but it's still not a generic name for a microcontroller. The PIC name should only be used for MICROCHIP's microcontrollers.

The Arduino (and "Arduino compatible") boards use AVR microcontrollers made by Atmel:
http://www.,atmel.com
Atmel's AVR microcontrollers are incompatible with PIC microcontrollers (even though they may have comparable features). If you call it anything other than a microcontroller, you should call the microcontroller on an Arduino an AVR.
They're often referred to as atmegas as well.
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