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Offline Homefire
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« Reply #110 on: January 23, 2010, 04:53:29 pm »
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I never figured out why they did that.

I think the op amps are only seeing -+ 5 volts .

As per the schematic, the only part seeing the 12v is the audio section and one trasistor doing the switching.

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« Reply #111 on: January 23, 2010, 05:04:28 pm »
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Normally you'd have a voltage splitter so that you have a virtual ground for the IC I'll have a look at the schem that you send it will help me to help out Aliman. I'm sure that he did not take the right measurements on those regulators.

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So many questions so little time
Offline alimanTopic starter
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« Reply #112 on: January 23, 2010, 05:18:35 pm »
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Xavier, here's a few pics of the PCB, hope this helps. I'm sure I took the right measurements, but I could be wrong.
If you can walk me through the Tests, I'm sure we'll figure this out together.

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« Reply #113 on: January 23, 2010, 05:31:16 pm »
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On the third picture , where does that ( on the left ) resistor comes from ?  Cornelius

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Offline alimanTopic starter
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« Reply #114 on: January 23, 2010, 05:44:01 pm »
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The resistor is across the Headphone jack, here's a pic. I think its of the right value, its the only size I had of that value.
 
Ali

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« Reply #115 on: January 23, 2010, 05:48:44 pm »
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OK Ali ,  this is resolved . Cornelius

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« Reply #116 on: January 23, 2010, 06:20:27 pm »
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When I checked IC2(79L05) it was the output I checked. On IC2 it is
 " COMMON-INPUT-OUTPUT ". I put the Positive test lead to the Output, and the Negative test lead to 0v, and Meter set at 20 VDC. I get a reading of  -1.89 vdc.
 On IC8(78L12) it was the Output I checked. On IC8 it is " OUTPUT-COMMON-INPUT ". I put the Positive test lead Output, and the Negative test lead to 0v, meter set to 20 VDC. Reading of  -0.34 vdc.
Were they done correctly ?

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« Reply #117 on: January 23, 2010, 06:45:42 pm »
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Are you checking the Right legs?

That is about what you would expect on the ground leg.

Make sure your checking the right legs.

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« Reply #118 on: January 24, 2010, 04:42:09 am »
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Yes I have just donloaded your pic's Ali I don't know how you can have a neg voltage on a pos reg you must remember that the legs on a 78Lxx ground is oposit to 79Lxx

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« Reply #119 on: January 24, 2010, 09:41:44 am »
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Yes I know they are on opposite sides.
 The 79L05  OUTPUT is on the right outer leg, looking at the flat face.
 The 78L12  OUTPUT is on the left outer leg, looking at the flat face.
 Thoughs were the readings I got.

In a earlier Post I descibed my Test procedure, was I correct on useing the Positive test lead to the OUTPUT and the Negative test lead to  0 volts.

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