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Offline GoldDigger1950
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« Reply #40 on: June 13, 2012, 04:57:14 am »
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Quote:Posted by viswanathmarachi
I have found another interesting thing in my circuit not sure if its common.  In the attached image the two highlighted resistors are 120K the one in green measures 120 with a multimeter when in circuit, and the other which is highlighted in red measures 10 times less i.e 12k and measures correctly(120k) when taken out of circuit.

Resistors in parallel are like that. We do need a schematic of your project.

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« Reply #41 on: June 13, 2012, 05:10:10 am »
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Viswanath M

In your post #35 you have a picture of the top of your PCB
is that how it right now ?
or have you made some changes since you took that picture ?

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Offline viswanathmarachiTopic starter
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« Reply #42 on: June 13, 2012, 05:44:25 am »
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Hi 6666,

Thanks for the reply.  I have made only one change i have changed a capacitor which fits right below 556 and beside PR1 (220k preset).  Previously it was 10nf now I made it 1nF which is correct.

-Viswanath M

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Offline GoldDigger1950
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« Reply #43 on: June 13, 2012, 05:47:16 am »
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We really do need to see the schematic you are using for this project before anyone can advise you any further.

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Offline viswanathmarachiTopic starter
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« Reply #44 on: June 13, 2012, 05:52:52 am »
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Hi GD,

The attached is the schematic that I am using for my project.

-Viswanath

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Offline GoldDigger1950
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« Reply #45 on: June 13, 2012, 05:57:57 am »
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Thank you. I'm going to a few meetings today (business) but it is raining cats and dogs here so this afternoon, I will review the circuit.

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Offline viswanathmarachiTopic starter
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« Reply #46 on: June 13, 2012, 06:29:58 am »
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Thank you GD.  Your kind time is much appreciated always.

-Viswanath M

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Offline GoldDigger1950
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« Reply #47 on: June 13, 2012, 06:49:57 am »
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After a cursory review, your schematic is markedly different from the one we have in our downloads area and if you mixed the schematic and board layout with another version, it may be that you have accidentally induced your own problem. Eventually, we WILL work this out.

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Offline viswanathmarachiTopic starter
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« Reply #48 on: June 13, 2012, 06:54:40 am »
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Thanks again GD for that courtesy...

-Viswanath

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Offline 6666
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« Reply #49 on: June 13, 2012, 07:18:39 am »
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Hey GD in post #1 Viswanath M called this a DP2

in comparing what is supposed to be the latest DP2 layout with
the board layout in post #35 there are some small differences in board layout
he needs to supply his board layout documents to.

Leave you with it


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