pistol dch

[Dubulumach]

Hi Zicos
you need to pick-up all transistors with same current gain h21e and balance gain to be same at input and output. This is sensitive symmetrical circuit. And you should shield the input and output particulary with metal boxes.

hyper big resisitor 100M-100G could be made easy with peace of ferrite core from small radio transformers and rf-chokes. simply find one core 1-2mm in diameter lenght 10-20mm and wound bare wire 0.2-0.3 several turns and solder all tightly. this would be one terminal of your resistor. same did at other side of core. Now you would have hyper big resistor for static detector. DCH85 box should be grounded and also earthed via your hand and body while searching for gold. Arm handle should made from metal not plastic also like a box. Other box variant is a very dry wood, Earthing derector via arm handle still worth for wooden box. Arm handle connect at virtual ground between batterirs - small triangle at sch. For 741 failures put 8 DIP socket and change 741 till find correct one. Good luck!


second variant

[Zicos]

thanks Dubulumach.👍. now I'm working on the first variation you uploaded in post 159. if I understood correctly the volts should have the same value on pins 3,2 and 6 of the 741.????

[abdou2014]

Of course, it's not a problem to make it from scratch if you understand the principle.It's confusing and full of mistakes on purpose.Franco Italy's only open-source project. Even then , not many people brought it to a working sample .It seems to have all the data and the author helps.

your words to my words are true

[abdou2014]

Of course, it's not a problem to make it from scratch if you understand the principle.It's confusing and full of mistakes on purpose.Franco Italy's only open-source project. Even then , not many people brought it to a working sample .It seems to have all the data and the author helps.

but everything is clear, you just have to concentrate, there are other more complicated designs, Like NMR sensor or the Laser antenna, but concerning the ionic or electromagnetic receiver you have all data .

[Pahom]

but everything is clear, you just have to concentrate, there are other more complicated designs, Like NMR sensor or the Laser antenna, but concerning the ionic or electromagnetic receiver you have all data .

If this is a question about what I have, then it will remain my little secret. And so yes, there are many answers to many questions on the forum, they are just scattered on different topics.And to find them, you will have to spend a lot of time reading posts.

[Zicos]

γεια σε όλους. η καλύτερη τιμή τάσεις τώρα που έχω πετύχει είναι pin 3 -0.5041 volt pin 2 -0.5283 volt και pin 6 0.0000 volt. για να το καταφέρω συνέδεσα το τριμ 1 ΜΩ ένα pin στο -9 βολτ, το μεσαίο σε σειρά με μια αντίσταση 100ΚΩ στο pin 2 και το άλλο pin από το τριμ στο 0 βολτ(gnd )του κυκλώματος . το ίδιο έκανα και με το pin 3 πρόσθεσα ένα τριμ 1ΜΩ με την 470ΚΩ με την ίδια σύνδεση -9 volt με 0 volt (gnd) . δεν ξέρω αν είναι σωστό αυτό γιατί το τριμ από το πόδι 3 αλλάζει τη τάση και στο πόδι 2 όταν το γυρίζω και το τριμ από το πόδι 2 σε κάποια σημεία δεν ανταποκρίνεται σε αλλαγές στην τάση στην είσοδο αλλά μόνο στην τάση εξόδου.ειναι εντάξει έτσι??? (όταν δεν ξέρεις πως είναι εκεί που θέλεις να πας, δεν θα ξέρεις πότε αν έφτασες).
hello everyone. the best voltage value now that I have achieved is pin 3 -0.5041 volt pin 2 -0.5283 volt and pin 6 0.0000 volt. to achieve this I connected the 1 MΩ trim pin to -9 volts, the middle one in series with a 100KΩ resistor to pin 2 and the other pin from the trim to 0 volts (gnd) of the circuit. I did the same with pin 3 and added a 1MΩ trim with 470KΩ with the same connection -9 volts to 0 volts (gnd). I don't know if this is correct because the trim from leg 3 changes the voltage on leg 2 when I turn it and the trim from leg 2 at some points does not respond to changes in the voltage at the input but only to the output voltage. is that okay??? (when you don't know where you want to go, you won't know when you've arrived).

[Dubulumach]

All tuning at real targets, bunch of gold or silver coins in the already cleaned solty ground mixed with charcoal 1.5-2kgg and time rest at last 5-6 months. In final version IC without socket and box need to properly shielding. Мetal box could be inserted in bigger dry wooden box. That's all. Without real test polygon nothing could be done with LRLs.

[Zicos]

hello everyone. I bought 5 TDA7000. one has 200 mA, three have 130mA and the other 60 mA. is the code fake?????

[aft_72005]

Hi Zicos
you need to pick-up all transistors with same current gain h21e and balance gain to be same at input and output. This is sensitive symmetrical circuit. And you should shield the input and output particulary with metal boxes.

hyper big resisitor 100M-100G could be made easy with peace of ferrite core from small radio transformers and rf-chokes. simply find one core 1-2mm in diameter lenght 10-20mm and wound bare wire 0.2-0.3 several turns and solder all tightly. this would be one terminal of your resistor. same did at other side of core. Now you would have hyper big resistor for static detector. DCH85 box should be grounded and also earthed via your hand and body while searching for gold. Arm handle should made from metal not plastic also like a box. Other box variant is a very dry wood, Earthing derector via arm handle still worth for wooden box. Arm handle connect at virtual ground between batterirs - small triangle at sch. For 741 failures put 8 DIP socket and change 741 till find correct one. Good luck!


second variant

In the DCH85 circuit... there is only one 555 oscillator that works independently.
Your circuit diagram is not the original design.
I built and tested the original DCH85 circuit. I added a volume of the Threshload to it.
It was able to detect a piece of copper that I buried in the ground about 13 years ago from about 3 meters.

[aft_72005]

Hi Zicos
you need to pick-up all transistors with same current gain h21e and balance gain to be same at input and output. This is sensitive symmetrical circuit. And you should shield the input and output particulary with metal boxes.

hyper big resisitor 100M-100G could be made easy with peace of ferrite core from small radio transformers and rf-chokes. simply find one core 1-2mm in diameter lenght 10-20mm and wound bare wire 0.2-0.3 several turns and solder all tightly. this would be one terminal of your resistor. same did at other side of core. Now you would have hyper big resistor for static detector. DCH85 box should be grounded and also earthed via your hand and body while searching for gold. Arm handle should made from metal not plastic also like a box. Other box variant is a very dry wood, Earthing derector via arm handle still worth for wooden box. Arm handle connect at virtual ground between batterirs - small triangle at sch. For 741 failures put 8 DIP socket and change 741 till find correct one. Good luck!


second variant

This circuit you did not draw part of.
Did you build this? Did it work in practice? What was the result?

[Zicos]

hi Aft 72005. What is the original dhc85 design you are talking about???? can you give it to me????

[aft_72005]

hi Aft 72005. What is the original dhc85 design you are talking about???? can you give it to me????

Hi Zicos
This schematic

[Zicos]

thanks Aft72005. I have a question, pin 3 of the 741 has a voltage of -8.7 volts. what should be the voltage of pin 2 of the 741 and pin 6 of the 741 for the circuit to work????

[Zicos]

Does the 741 in the circuit work as an amplifier or comparator???

[aft_72005]

Does the 741 in the circuit work as an amplifier or comparator???

It is a comparator.