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What a perfect job! This is the best pcb for GS4：好的
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I plan to drill the holes with smd
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I want to use dbanner's original PCB now, he is the best, or use two kinds of PCB at the same timeComment
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Before Gerber-ing the file to china pcb factory, I must state emphatically that I take no responsibility for any error on the layout.
I did this merely as an exercise in reverse drawing.
The layout is unverified.Comment
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In addition, I don't think that merely posting a graphical drawing of a PCB layout violates any proprietary rights.Comment
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It is really stupid to simply copy according to the PCB. I will check the schematicComment
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violates any proprietary rights
can you take on yourself a contact with Eric's wife? your profile is naked, i do not see you are in US or GB...Comment
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This is the link where there is more information about the four position switch.
https://www.geotech1.com/forums/showthread.php?17372-Goldscan-IV-4-position-switch-question&p=123458#post123458Comment
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Now things are much clearer. Selecting between high conductor and low conductor is suggested as a possible mod. If this is so then tdi audio circuit could be wired up to the main circuit? Now that would be a very nice modification indeed.Originally posted by Jose View PostComment
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Please dispell any notion of me contacting anyone. I like experimenting and tinkering with electronics. For me, that is enough.Originally posted by kt315 View PostComment
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Dbaner you have the same desktop as mine. How do you think gs 4 works ?Or you had a pcb that you copied without the box ?Comment
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Quote taken from above thread:Originally posted by Jose View Post
""sw 1-C could be eliminated. SW1-A replaced with a toggle switch switching between the gold channel and the GB control. SW1-b could be replaced by a toggle also. This would be a little different toggle that would be closed in the center position. In the other two positions, the signal going to the two inputs would be opened, with one open in one position and the other opened when switched the opposite way.
This simple mod would allow the operator to select either low conductor, high conductor or all mode. In the all mode, the signal from both diodes would go to the next stage. In either of the two modes, one if the two signals would be opened.
One other thing I should mention is, when I refer to positive or negative responses, this can't mean the tone will change to a positive or negative signal, but, rather which of the two diodes will conduct on U13B.
Because of the fact the two signals from the diodes will ultimately result in a positive tone, then shutting off one of the two diodes will still have the same audio response but will simply cause the detector to ignore either high or low conductor objects.
In other words, the positive or negative response I referred to before has to do with which diode will conduct and what the polarity of the output of U13B will be.""Comment
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I already commented on this modification before, but I put it again as a reminder.
GS4 works well with large coils, if the integrator is modified for a slower response. You have to reduce the value of the 68k resistors in both channels.
I use a double switch to connect resistors in parallel and reduce their value.
You can experiment with the values, I use two 39K resistors, an example of this can be seen in the Superscan schematic.Comment
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