Testing the module AV400 - diyAudio
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Old 10th March 2007, 04:47 PM   #1
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Default Testing the module AV400

As the AV400 adjusts and where the measures are taken, voltmeter in vdc and bornas where they are put.
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Old 10th March 2007, 04:50 PM   #2
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All these values are verified and agree with the table of down.

R3~1.6 volts
R5~1.6 volts
R15~1.0 volts
R8 ~14.6 volts
ZD1~15 volts
Offset voltage at R11 should be close to 0 volts, but can be as high as 100mv.
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Old 10th March 2007, 04:58 PM   #3
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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.

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