Speaker Turn On Delay and DC Protector Board Set (V2) - Page 8 - diyAudio
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Old 30th March 2013, 12:10 PM   #71
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Quote:
Originally Posted by AndrewT View Post
The F5 will output a larger offset when cold and during warm up.
The speaker relay could be detecting that and refusing to close.

A longer time delay would give the F5 more time for the bias currents to settle.

Once a DC detector is triggered they can take a long time to unlatch and some rely on leakage current to get the trigger voltage down below threshold.
How would I extend the time delay?

Also, it blinks at a very high speed. Would that indicate a construction problem?

Thanks for the help.
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Old 30th March 2013, 12:14 PM   #72
AndrewT is offline AndrewT  Scotland
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I have not bought the DIYaudio pcbs and so have not experimented with them to determine how they respond to trigger signals.

Hopefully someone who has purchased them will have done some testing and can report here.
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Old 30th March 2013, 12:29 PM   #73
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Jojo, any ideas?
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Old 31st March 2013, 12:04 AM   #74
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I just checked the voltages on the F5 after working it hard for a couple of hours:

Left channel: 5.96v bias, 3.5mv offset
Right channel: 5.96v bias, 0.0v offset

So I don't know why the speaker protector would have a problem with DC with this one.
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Old 31st March 2013, 02:07 PM   #75
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Quote:
Originally Posted by McQuaide View Post
Jojo, any ideas?
Could you please post the transistors you used? It is not a "picky" circuit, so any reasonable general purpose transistor can be used.

Also, please check your construction, parts orientation, polarity, etc. There could be two possible causes for the circuit not to trigger. One is DC offset, but since you posted very low DC offset readings, then the second one could be that there is not enough voltage build up at C3.

Checking the parts values, one by one usually shows the culprit. It is not a surprise to mistakenly think that a 2.7M is a 270K resistor.
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Old 31st March 2013, 02:21 PM   #76
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hello
T6 which I could use for 4 relay?
My amp is 4 chanels.
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Old 31st March 2013, 04:41 PM   #77
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Quote:
Originally Posted by JojoD818 View Post
Could you please post the transistors you used? It is not a "picky" circuit, so any reasonable general purpose transistor can be used.

Also, please check your construction, parts orientation, polarity, etc. There could be two possible causes for the circuit not to trigger. One is DC offset, but since you posted very low DC offset readings, then the second one could be that there is not enough voltage build up at C3.

Checking the parts values, one by one usually shows the culprit. It is not a surprise to mistakenly think that a 2.7M is a 270K resistor.
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...

Click the image to open in full size.

Last edited by McQuaide; 31st March 2013 at 04:48 PM. Reason: added photo
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Old 31st March 2013, 06:01 PM   #78
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I just rechecked everything, went over the board with a magnifying glass, and tried it again. It trips after 4 seconds or so with nothing connected to it. Still won't close the relays with either of the F5 outputs connected. I monitored DC during power up on each channel, and it's under 10mv.

The F5s are being fed by a Mesmerize buffer which takes 8 seconds or so to engage its relay. So the F5s have nothing on their inputs during power-up. I wonder of this matters?

JohnGeneva above had the same issue, and he said he just built another board, and that one works with his F5.
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Old 1st April 2013, 04:10 AM   #79
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Thanks McQuaide for the giant pictures. When you get past 60 it helps...a LOT!
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Old 1st April 2013, 10:28 PM   #80
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Originally Posted by organics1 View Post
Thanks McQuaide for the giant pictures. When you get past 60 it helps...a LOT!
You're telling me...
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