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geo greetings!!
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To make the 707 gold gun work much better without the meter, you can touch the left side of the male banana connector (negative) with your hand to ground it and it begins to be more sensitive.treasure hunting is the best hobbyComment
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it's not that the true gold gun that's work, tell to Geo to post here his schematics
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Why don't you do it yourself, maybe Geo will help if he deems it necessary. Personally, I am not aware of any other schemes for the golden pistol.Unless there are attempts to do this on other chips.But the principle itself remained the same.Originally posted by abdou2014 View Postit's not that the true gold gun that's work, tell to Geo to post here his schematicsComment
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The file is the same as it is in the post above. The instability of the job was due to my carelessness . The legs of the microcircuit were poorly soldered.When I re-soldered and removed the flux from the board, the receiver began to work without unnecessary noise.Originally posted by nysa View PostComment
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LM358 is considered an alternative and is equal to LM324
I don't know. Why are sensitive random access general purpose receiver circuits used? To detect treasure fields.
There is a very simple sensitive radio circuit which is a 10 transistor audio receiver, amplifier and decoder circuit compressed into one....
TA7642. operates on very low current to prevent noise....
Working frequency range 150kHz-3MHz LW/AM/SW1 I don't know if such circuits can be used.Comment
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Two tricks for goldgun.
1. With the use of a VLF receiver find if there are signals between 10 ... 35 khz at your area and tune the GG near to those signals.
2.Use a chip with more bandwidth and replace the feedback resistors for more gain. A gain near to 40...45 at every op.ampl is ok. More gain will make GG unstable.
Good luck
GeoComment
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This is my final attempt. I have used one more operational amplifier from the IC separately for the signal indication, with adjustable gain, and another one for the sound. I also added a voltage-doubling circuit with diodes at the output for the level indicator, which increases the voltage up to 5 volts.
I also performed a test using a 5-watt transmitter at a distance of 25 meters. We can see the signal drop when it approaches the metal manhole covers and rise again after passing them.
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Hello Bill. Don't work it with so big angle to ground. Use it at horizontal position and triagle for pinpoint. Also try a true rms voltmeter not a simple rms or a dc voltmeter.
My best wishes....GeoComment
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Dear Rider
İ have a question about your
Your upper 2 pin +/- inputs
Your bottom 2 pins are for audio ,right? ,but just after first amplification. No seconder AMP ,which is on orginal shematic
Middle 2 pin Signal output for ADC .. this is using seconder opamp same as original ,but it has adjustable feedback tesistor to control amplification, after amplification AM modulation with Fisrt diode , and negatif Signal cutting for rectifying with second diode.then a capacitor (sample hold)
Right?
İf o am right..there should be drain tesistor parallel to condansator.
Above ,i was trying to clarify..what did i understand.. o May be wrong.
Mu question iş at pin7 of lm324.
There is no output connection.
Your comnections looks like TMS circuit ..even İC ido not have rms function...
But there is no out put connection.. why.. what is the aim of using pin5,6,7. And related r c etc.
ThanksComment
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Mr Rider
İ inspected your other modifications.
You are great. İ do appriciate your idea of data transfer to pc.
And idea of adjustable varicap..why dıd you give up at last version about it.
İs it difficult to tune Signal??
Or difficult to supply 500p varicap..
On your test video. Decrease of Signal while passing over manhole.
İs the reason of decrease cavity or iron
İf the target were nin ferrous. What would happen. Signal will increase???Comment
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