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Offline GoldDigger1950
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« Reply #20 on: May 24, 2010, 01:32:20 pm »
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As long as they reside in your spare parts bin, it's an easy choice.

Do you know where the drift begins in the circuit? I've had weird problems in the past where the scope probe would "fix" the problem at a certain spot in the circuit giving me a clue as to where the problem originated.

One other thought comes to mind. Is anyone else having the same issue as you? Is this a design flaw rather than a problem to troubleshoot?

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!

Offline Paul ATopic starter
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« Reply #21 on: May 24, 2010, 02:21:28 pm »
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Gd!
Genius!
I found where the drift was starting - around ic4.
This is what is in the documentation (pity I didn't read it before!)

"There are two other particularly important features in this design. The first is the method of drift cancellation which is applied
around IC4. Despite its mundane sounding number, the LM318 is a very fast high gain amplifier which can recover immediately
from large overdrive, and then amplify very small signals without overshoot or ?ringing?. To use it to its full benefit in this circuit
it needs to be d.c. coupled and operated at the highest gain possible. With this level of gain. battery voltage and temperature
changes produce significant output voltage shifts, which would mean regular re-adjustment of the frequency control."


I couldn't see anything particularly wrong, all my soldering looked good, no dry joints.

So I took the i.c. out of it's holder and used a little contact cleaner ......

It's now solid as a Rock! Great Great Great

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Offline xavier
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« Reply #22 on: May 24, 2010, 02:41:38 pm »
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Well done Paul and having the idea to clean the contacts on that IC now that was good

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So many questions so little time

Offline GoldDigger1950
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« Reply #23 on: May 24, 2010, 02:43:41 pm »
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Paul, I hoist a cup of coffee in your general direction as a toast to you!

Well done!

Go find gold!

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!

Offline jaber.nouri
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i dont have
« Reply #24 on: May 05, 2011, 11:03:55 am »
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stuart2 TREASURE HUNTER Waveing

Posted on: May 05, 2011, 11:00:21 AM
i need gold pic 3 pcb cuper any body would help me!! Cry

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