Testing the module AV400

fjromero · 10th March 2007, 04:47 PM

As the AV400 adjusts and where the measures are taken, voltmeter in vdc and bornas where they are put.
thanks

fjromero · 10th March 2007, 04:50 PM

All these values are verified and agree with the table of down.

R3~1.6 volts
R5~1.6 volts
R15~1.0 volts
R12~500mv
R13~500mv
R8 ~14.6 volts
ZD1~15 volts
Offset voltage at R11 should be close to 0 volts, but can be as high as 100mv.

fjromero · 10th March 2007, 04:58 PM

But first connect the voltmeter across one of the o/p stage Source resistors using Alligator leads.
Now reapply power to the amplifier and slowly adjust P1 while watching the voltmeter, for a
reading of 18mv. This sets the bias current in the output stage to just under 100ma per device.

In as resistance checked, in those of 0,22 ohms. or in the 470 ohms.

thanks

10th March 2007, 04:47 PM	#1
fjromero diyAudio Member Join Date: Oct 2006	Testing the module AV400 As the AV400 adjusts and where the measures are taken, voltmeter in vdc and bornas where they are put. thanks

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10th March 2007, 04:50 PM	#2
fjromero diyAudio Member Join Date: Oct 2006	All these values are verified and agree with the table of down. R3~1.6 volts R5~1.6 volts R15~1.0 volts R12~500mv R13~500mv R8 ~14.6 volts ZD1~15 volts Offset voltage at R11 should be close to 0 volts, but can be as high as 100mv.

10th March 2007, 04:58 PM	#3
fjromero diyAudio Member Join Date: Oct 2006	But first connect the voltmeter across one of the o/p stage Source resistors using Alligator leads. Now reapply power to the amplifier and slowly adjust P1 while watching the voltmeter, for a reading of 18mv. This sets the bias current in the output stage to just under 100ma per device. In as resistance checked, in those of 0,22 ohms. or in the 470 ohms. thanks

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