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Offline mafarid
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« Reply #210 on: February 25, 2010, 11:56:52 am »
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hello

Dear Ram did you have any modification on original circuit?
I constructed the DP of eugene52 but not work.
My coil is 30cm Diameter of 0.5mm wire in 35 turns
(2.6 Ohm ? 1.044 mH)

I could not find the 200K Pot and used 220K pot.
Power supply in 12V show different current rate from 60mA to 120mA.
The SP has sound and frequency of it change by tuning of volumes and it never muted by pressing TUN key and tuning of pot.

Does This circuit has any test point or some things like that for test the circuit?
can any one past the sounds of fine tuned DP?

Thank you,


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« Last Edit: February 25, 2010, 12:04:30 pm by mafarid » 		Logged
Offline tagaquezon
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« Reply #211 on: February 25, 2010, 08:14:19 pm »
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in my case of continued sound of speaker, it is caused by bad solder of parts. It took me 3 boards before i finally make a working DP. Club

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« Reply #212 on: February 25, 2010, 10:23:30 pm »
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Hi

It is impossible because I re soldered all pins of circuit and checked the placement of all circuit?s parts. No no!
My friend I am not a beginner. Wink

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« Reply #213 on: February 26, 2010, 12:45:02 am »
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Meybe you bern  Devil sam parts wyth the solder

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« Reply #214 on: February 26, 2010, 01:18:47 am »
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Hello

 Grin My friend I am not a beginner!!!
I built the ?Stuart I? PI easily and successfully in metal detectors.
Does This circuit has any test point or some things like that for test the circuit?
can any one past the sounds of fine tuned DP?


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« Reply #215 on: February 26, 2010, 01:55:31 am »
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I want to build DP as soon as possible in single board layout,

but did you adjusted the frequency?

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« Reply #216 on: February 26, 2010, 08:18:25 am »
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Quote:Posted by mafarid
Hello

 Grin My friend I am not a beginner!!!
I built the ?Stuart I? PI easily and successfully in metal detectors.
Does This circuit has any test point or some things like that for test the circuit?
can any one past the sounds of fine tuned DP?



have you used cd4066 or hct4066 ?
1-check resistor near ne555 & speaker
2-remove battery checker sircuit
3-now im making 2 side board more stable  Mad

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Offline mafarid
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« Reply #217 on: February 26, 2010, 09:30:26 am »
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Hi

I used CD4066, CD14538, LF357, NE555, NE556 and TL062CN.

?Check resistor near ne555 & speaker?
 Which resistor 39 OHM or 2 OHM? but I used 500 OHM volume for 100 OHM volume.

The battery monitor work nice because when voltage level drop less than 9.56 red LED turn ON.

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rabdoskopy
« Reply #218 on: February 27, 2010, 01:34:49 am »
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Ι have a question, can i use LT1357 insted of LF357 ??  is it beter Huh? Huh?  Huh?

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« Reply #219 on: February 27, 2010, 03:04:45 am »
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LF357 and LT1357 look similar

I finally found a bug in my assembled circuit. Idea
Two 100n capacitors on beside of TL062 had wrong position. Crazy
Now continued sound problem solved and another problem occurred. Cry
When I turned on DP, I have sound and by pressing TUN key or waiting for 3-5 second this sound die.
I tried to have sound by tunings Pot or volumes but nothing occurred ?
When I putted a big metal box, I have same problem but when I shake coil on metal box I had very low sound.

I have most analyze and metering instruments. If somebody have any test point like below schematic, it will be so useful.


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