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Speaker Turn On Delay and DC Protector Board Set (V2)
Speaker Turn On Delay and DC Protector Board Set (V2)
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Old 21st January 2017, 04:15 PM   #171
McQuaide is offline McQuaide  United States
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Join Date: Jan 2011
Location: Southeastern Pennsylvania
Quote:
Originally Posted by McQuaide View Post
I used this one for T6

MPSA06 Central Semiconductor | Mouser

And these for T1-T5

2N5232A Central Semiconductor | Mouser

I'll check the resistors one more time but I think they are right. I just went over the Mouser BOM I used, and all the right values were ordered.

Sorry for the giant photo...
Quoting myself here, I dug the speaker protector out of a drawer (I had given up) and found a simple bad solder joint. The unit now works as advertised and passes the test when connecting the amp in to D6.

Is there a good way to test this board with a battery? At what DC voltage should the relay open?
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Old 22nd January 2017, 08:25 AM   #172
AndrewT is offline AndrewT  Scotland
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Most will trigger @ 1.5Vdc from a battery.
Some will trigger slowly at this voltage, others trigger quickly.

The real test is to apply a half power to full power signal from the power amplifier and slowly decrease the frequency from 100Hz to 5Hz and see if it triggers cleanly when the frequency is below 20Hz. You don't want false triggering of audio frequencies that could be valid signals.
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Old 22nd January 2017, 01:38 PM   #173
McQuaide is offline McQuaide  United States
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Quote:
Originally Posted by AndrewT View Post
Most will trigger @ 1.5Vdc from a battery.
Some will trigger slowly at this voltage, others trigger quickly.

The real test is to apply a half power to full power signal from the power amplifier and slowly decrease the frequency from 100Hz to 5Hz and see if it triggers cleanly when the frequency is below 20Hz. You don't want false triggering of audio frequencies that could be valid signals.
Dumb question, but how is the battery connected? Negative to the amp circuit ground?
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Old 22nd January 2017, 04:17 PM   #174
AndrewT is offline AndrewT  Scotland
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The 1.5V battery should trigger the DC detection in either direction.
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Old 23rd February 2017, 02:06 AM   #175
mattmcl is offline mattmcl  United States
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Originally Posted by ncg2013 View Post
Hi All, I hope someone can give me some guidance here I have just finished filling the speaker protector board V2 and starting to test. When powered up led 2 is lit and led 1 is lit steady but does not flash as it is supposed to. The relays engage. Both DMM do read zero resistance. When I do the DC protection test I do not hear the relays disengage, no protection! I have checked the orientation of the transistors these are ok. I have used all the suggested components on the BOM. Transistors for T1 to T5 are KSC945CGBU and if i have read the spec sheet correctly have a pin orientation of ECB, and T6 is an 512-MPSA06 and pin orientation is EBC, so all transistors match the board layout. What else can i check to see what is wrong?
I'm having exactly the same issues with my V2 board. I don't have a record of what parts I used but I too followed the V2 build guide. What did you do to fix?
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Old 23rd February 2017, 11:29 PM   #176
mattmcl is offline mattmcl  United States
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Location: Erie, CO
Quote:
Originally Posted by McQuaide View Post
I used this one for T6

MPSA06 Central Semiconductor | Mouser

And these for T1-T5

2N5232A Central Semiconductor | Mouser

I'll check the resistors one more time but I think they are right. I just went over the Mouser BOM I used, and all the right values were ordered.

Sorry for the giant photo...
Did you have to bend the legs of these, or were they the correct configuration?
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Old 12th August 2017, 03:29 PM   #177
McQuaide is offline McQuaide  United States
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So I was re-biasing my amp and checking DC offset, and found 170mv DC on one channel and 60mv on the other. Turns out it's the speaker protector board putting this out, the amp is putting out zero. Is this normal? I took it out of the circuit for now.
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Old 12th August 2017, 06:51 PM   #178
scottjoplin is offline scottjoplin  Wales
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Are you using this circuit? http://www.diyaudio.com/forums/image...-schematic.pdf
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Old 13th August 2017, 12:44 PM   #179
McQuaide is offline McQuaide  United States
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Yes that's the one.
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Old 13th August 2017, 01:25 PM   #180
scottjoplin is offline scottjoplin  Wales
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What you describe is not normal and I can't explain it. What exactly did you do when you took it out of circuit and where did you measure the offset?
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