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Dx Blame MKIII-Hx  - Builder's thread
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Old 18th January 2012, 06:24 PM   #791
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Rudy, the voltage you are measuring across the "fuse-resistor" depends on the value of this resistor.

As I understand it, Carlos recommends a quisecent current of 100mA.

If you use a 47 Ohm, then your multimeter will read 4.7V; if you use a 100 Ohm resistor, your multimeter will read 10V.

Please check Carlos' recommendation once more.

Best regards - Rudi
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Old 18th January 2012, 07:40 PM   #792
BMW850 is offline BMW850  Netherlands
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I short the input signal hot to signal ground.
Everyting is good, emitter resistor I measure 1 milivolt constant.

@ Rudi, I measure over 100 ohm resistor 4,7 volt.
And I check Carlos recommendation

Regards,
Rudy
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Last edited by BMW850; 18th January 2012 at 07:42 PM.
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Old 18th January 2012, 07:55 PM   #793
AndrewT is offline AndrewT  Scotland
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What is the output offset in mVdc?
What is the output noise in mVac?
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Old 18th January 2012, 08:30 PM   #794
BMW850 is offline BMW850  Netherlands
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Quote:
What is the output offset in mVdc?
I short the input signal hot to signal ground, and I measure 19,20 volt DC output offset at the speaker terminals.

Quote:
What is the output noise in mVac?
Sorry you or anybody else explain to me how I measure that?
I short the input signal hot to signal ground, I measure between 1,5 and 3,2 mV AC output at the speaker terminals, it goes up and down.

Regards,
Rudy
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Last edited by BMW850; 18th January 2012 at 08:58 PM.
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Old 18th January 2012, 09:15 PM   #795
BMW850 is offline BMW850  Netherlands
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I forgot to mention. I power up directly from the mains, and I have the fuse in there.

Tomorrow evening I go further, go to sleep now early day tomorrow.
I short the input signal hot to signal ground, and I measure 19,20 volt DC output offset at the speaker terminals

Let me know where are the errors

Regards,
Rudy
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Last edited by BMW850; 18th January 2012 at 09:45 PM.
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Old 19th January 2012, 10:00 AM   #796
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by BMW850 View Post
I short the input signal hot to signal ground, and I measure 19,20 volt DC output offset at the speaker terminals..............
I short the input signal hot to signal ground, I measure between 1,5 and 3,2 mV AC output at the speaker terminals, it goes up and down
Quote:
I forgot to mention. I power up directly from the mains, and I have the fuse in there.
You are being foolhardy.
Why are you powering up direct on line?

The 19Vdc output offset shows there is a wiring error.
The variable 1.5mVac to 3.2mVac could be showing noise or oscillation or hum at the output. But you must sort the output offset first and any oscillation if it exists, before you can be sure that the mVac reading is noise.
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Old 19th January 2012, 12:42 PM   #797
BMW850 is offline BMW850  Netherlands
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I have all mounted components as described on print screen, hopefully there are no errors on print screen.
All parts measured and sorted before and when I took in the components for soldering, again as first measure the resistors.

Well that I have been reckless, the output offset mVdc and the output noise in mVac I forgot to measure that yes that was stupid, all the other measures good

The GND I use as the minus for the speaker output (out the +) and the other 3 wires (+60v -60v GND) are good connected otherwise we have a lot of smoke.

I know it’s difficult to tell what’s wrong from a distance, but where shall I search the error first.

Regards,
Rudy
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Last edited by BMW850; 19th January 2012 at 12:44 PM.
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Old 19th January 2012, 01:04 PM   #798
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Rudy,

do all legs of all transistors that you have mounted vertically, show infinite resistance (MOhm scale on your DMM) in respect to the heatsink?

Rudi
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Old 19th January 2012, 01:08 PM   #799
AndrewT is offline AndrewT  Scotland
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Pics of the open chassis and close ups of the detailed wiring.
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Old 19th January 2012, 01:29 PM   #800
BMW850 is offline BMW850  Netherlands
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Full resolutie is to big
Attached Images
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File Type: jpg 20120119_141630.jpg (352.8 KB, 184 views)
File Type: jpg 20120119_141809.jpg (412.8 KB, 164 views)
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