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Offline earthope
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« Reply #400 on: August 06, 2010, 07:32:34 am »
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Thanks GoldDigger1950 that was great help, i will start working on the Delta pulse now

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Delta Pulse stage assemply
« Reply #401 on: August 11, 2010, 01:02:20 pm »
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Hello Eugene, I'm having trouble defining what cable I use to connect the coil.
Tested and gave some trouble. Should I use a coaxial cable with two conductors and connect the mesh at which point the circuit? Idea
Delta Pulse 2
Please respond. Smiley
Thanks

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Offline GoldDigger1950
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« Reply #402 on: August 11, 2010, 03:21:04 pm »
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Quote:Posted by Wilson
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Hello Eugene, I'm having trouble defining what cable I use to connect the coil.
Tested and gave some trouble. Should I use a coaxial cable with two conductors and connect the mesh at which point the circuit? Idea
Delta Pulse 2
Please respond. Smiley
Thanks

The mesh connects to ground or earth, depending on what you call it. The two wires go to the coil itself on one end and the circuit board on the other. Be sure to keep the coil wire vertical to the coil plane until you get a fair distance up the shaft. A length of 6 inches would be good. After that, you can wrap the wire around the coil shaft.

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Delta Pulse stage assemply
« Reply #403 on: August 11, 2010, 04:56:17 pm »
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Tradu??o do portugu?s para ingl?s

Thank Golddigger, Excuse me I have more doubts.
Grounding the mesh is attached to the negative battery or the virtual ground circuit?
It is normal to use this cable with two conductors with mesh?
Currently I'm using a mono cable conductor as attached.
Another question, in my circuit adjustments Noise, signal sens and keeps the minimum setting when I increase triggers the speaker, what's wrong?

LF357 TL081 replaced
TL062 TL072 replaced
Thank Golddigger

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Offline GoldDigger1950
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« Reply #404 on: August 11, 2010, 10:55:22 pm »
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The LF357 cannot be substituted. The TL072 looks to be an acceptable substitute for the TL062 but be careful about overheating.

The shield or braided cable is attached to GROUND not to VIRTUAL GROUND. The ground is defined clearly in the schematic. The virtual ground is implied based on the +12 and -12 power sources. Do not mix them up.

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Offline Eugene52Topic starter
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« Reply #405 on: August 12, 2010, 10:20:23 pm »
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Less than one year ago I posted a jpeg image of a corrected and "final" delta pulse PCB board , now I can not find it on the Forum . It strangely seems to be missing  Shocked  plus My laptop of MD files is 300 miles away  Grin .... So Tommorrow I will post it as requested by a great new forum member-Project builder too !! I love missing files .

HH...........Eugene

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Offline GoldDigger1950
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« Reply #406 on: August 13, 2010, 01:08:40 am »
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Quote:Posted by Eugene52
Less than one year ago I posted a jpeg image of a corrected and "final" delta pulse PCB board , now I can not find it on the Forum . It strangely seems to be missing  Shocked  plus My laptop of MD files is 300 miles away  Grin .... So Tommorrow I will post it as requested by a great new forum member-Project builder too !! I love missing files .

HH...........Eugene


Here's what I have, Eugene. It probably came from your files.

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« Last Edit: December 31, 1969, 06:00:00 pm by GoldDigger1950 »
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Offline Eugene52Topic starter
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« Reply #407 on: August 13, 2010, 10:22:33 am »
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Thank-You Golddigger . I will also add these 2 "tiny lost files" and that will end the wild
goose chase !!! I hate when I can not find something , could it be old age ?

Best Regards to Everyone !!  HH......Eugene

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« Reply #408 on: August 15, 2010, 05:28:10 pm »
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Hello to all, the assembly phase almost complete Delta Pulse 2.
LF357 TL081 substituted "high sensitivity"
TL062 TL072 replaced
Added TRSHOLD manual, it was with great stability and greater depth to get the gold ring.
In use battery notbook 12.6 v Lithium, many hours of use.
Only tests performed in air.
Thanks to all the forum for tips and information.
Below pictures of the assembly attached.
I'll post test information in the field. Detecting
Thanks

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Offline GoldDigger1950
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« Reply #409 on: August 16, 2010, 04:16:16 am »
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Wilson, the LF357 cannot be substituted because of the frequency response. The TL081 only works for lower frequencies. It's been tried in this circuit and it doesn't work. It's unfortunate because the only place to get them now is from salvage.

A minor redesign might be required to replace the part, not substitute it, with a more modern part and an updated circuit.

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