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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 7th November 2014, 04:00 PM   #101
Krisfr is offline Krisfr  United States
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What I am proposing is a cell phone like power supply walled plugged 12 V 1 or 2 amp plugged into a AREA of a amp pcb that will run and control the amp...
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Old 7th November 2014, 04:02 PM   #102
jwilhelm is offline jwilhelm  Canada
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What I am proposing is a cell phone like power supply walled plugged 12 V 1 or 2 amp plugged into a AREA of a amp pcb that will run and control the amp...
A phone charger is pretty light on current for the relays needed. There is a 12 0 12 relay on board here dedicated to this board only.

Last edited by jwilhelm; 7th November 2014 at 04:04 PM.
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Old 7th November 2014, 04:39 PM   #103
Krisfr is offline Krisfr  United States
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A phone charger is pretty light on current for the relays needed. There is a 12 0 12 relay on board here dedicated to this board only.
This relay only uses 77mils, could it be used?

G8P-1C4P DC12 Omron Electronics Inc-EMC Div | Z1009-ND | DigiKey
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Old 7th November 2014, 05:02 PM   #104
Krisfr is offline Krisfr  United States
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Or we could use some MosFet output relays... like www.esperado.fr - Protection d'amplificateur ultime

Maybe better in that it is all solid state...
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Old 7th November 2014, 05:07 PM   #105
jwilhelm is offline jwilhelm  Canada
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I prefer chassis mount relays personally. I'm on a phone so it's tough to pull up a data sheet but I don't think those are rated for 120/240 vac.
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Old 7th November 2014, 05:11 PM   #106
Krisfr is offline Krisfr  United States
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I prefer chassis mount relays personally. I'm on a phone so it's tough to pull up a data sheet but I don't think those are rated for 120/240 vac.
Switching Voltage 250VAC, 28VDC - Max
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Old 7th November 2014, 05:15 PM   #107
jwilhelm is offline jwilhelm  Canada
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How large are they? If they are the small automotive version they might be good to keep everything self contained.
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Old 7th November 2014, 05:24 PM   #108
Krisfr is offline Krisfr  United States
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How large are they? If they are the small automotive version they might be good to keep everything self contained.
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File Type: gif Layout Relay.GIF (140.9 KB, 456 views)
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Old 7th November 2014, 05:41 PM   #109
jwilhelm is offline jwilhelm  Canada
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I use those for power windows. I didn't realize they had such a high voltage rating.
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Old 7th November 2014, 06:19 PM   #110
koja is offline koja  Canada
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my control board has its own 9-0-9V transformer for 12V to drive fan and also a 5V reg for driving relays.
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btw, on the subject of active cooling: for all practical purposes the quiet Noctua fan is impossible (!) to pick out noisewise. I have to lean over the amp and look hard through a 9nch long heatsink to see if it is spinning. (you could see here other members (lhquam) say the same about the fan). btw I profesionally deal with unwanted noises in cars, often very subtle noises right off the noise floor in measured data, so you can take my expert word for it (I won't bother taking measurements, just check out the press they received).
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yes we used PICbasic and some assembler too where it was necessary.

a suggestion: to make a full use of a platform like Arduino, and if you guys want to attract others you want to put a lot of thought into making an architecture which can be reconfigured with jumper settings for as many different functions as possible and do it as a COLLABORATIVE GROUP PROJECT! (i.e. invite others with skills and time to spare).

you may also want to add sought-after, mainstream functions like multichannel volume control, with variable gain settings, etc. etc. see Mikkel's boards at www.dantimax(dot)dk . a nice display with multi-level user interface with turn/push buttons is also a must (see AlephP example at DIY Audio Projects ).you also may have to put A LOT of effort into documenting everything for others and be ready to make the source code available for custom modifications if necessary, (for example to drive a different model fan).

I never fed all the changes we made on prototype boards back into schematics etc. (a lot of handwritten notes on the original sch), and I am so busy with other projects I cannot post anything right away. but I can later on if you will benefit from those.

Last edited by koja; 7th November 2014 at 06:22 PM.
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