Lrl from Italy

[JHERICKU]

Hello franco..Any idea about pcb e schema made by Dream man..is it ok to use?Thankbu in advance..

[mustefa ubram]

PCB FOR 20MHZ SENSOR

[FrancoItaly]

Good work, Mustefa

[JHERICKU]

Because of the machine, I got a huge wealth, I detected a lot of gold and silver and bronze, if you haven't succeed in doing, you can ask me why, I will guide you how to adjust

Hi liudengyuand..how did u made the curicuit effective?can u tell us more..

[Jeg]

Hi liudengyuand..how did u made the curicuit effective?can u tell us more..

Hey Jhericku
The circuit is effective by itself. Franco designed it very nicely. You don't need to change anything. It confirmed that detects only noble metals and no iron! Mine, it also can not detect copper


Just tune it to a harmonic that gives a nice output and you are there. Location distance not more than 4-6 meters. Works every day no matter the conditions. It is just that depending on the day, the field sometimes is weaker but still detectable.


If anyone likes to go deeper on this, then i suggest you to use a simple voltmeter instead of leds.


ps. I use a 16MHz crystal by the way. No stability problems.

[JHERICKU]

Hi there Jeg do you pcb on the sensorof 8mhz?can u share?I built the display and the two leds lights when I turn on theswitch..Is it normal? even I turn the potentio meter there isno changes at all..I wish to measure the output of the display stage with multimeter..which pin of IC to check?Thank u in advance..

[Jeg]

Hi there Jeg do you pcb on the sensorof 8mhz?can u share?I built the display and the two leds lights when I turn on theswitch..Is it normal? even I turn the potentio meter there isno changes at all..I wish to measure the output of the display stage with multimeter..which pin of IC to check?Thank u in advance..

My friend, i never use ready pcb drawings as i do it for experimentation. I usally make them in ready test pcb boards like in the pic.



i used the circuit of 20MHz drawing with the trimmers.



No its not normal. You should be able to adjust your output so to light just the first led.
You have two pots for the device. One for the differential amplifier and one for the gain. The first one is the most important. Personally i have omitted the gain pot and i fixed my device to the maximum gain which is something like 6 times. The first pot will take your output down to minimum levels so only one led will light.

[JHERICKU]

waht do u think is better?8 mhz or 20? did you also use double face pcb on 8mhz version?I think I will back again from the start..any way this display pcb I used..

[JHERICKU]

I dont know who owns this pcb on display..I
This isthe one I have used but when I turn on the switch..the two leds lights continuously even I turn the potentiometer..Can any one help me..Thanks..

[JHERICKU]

hello Ealk man Can I used value of crystal aside from 20mhz?Is it ok for 16,10 or is it only for 20mhz?thank u in advance..

[Jeg]

prototype pcb board with copper plates isolating oscillator

[Jeg]

waht do u think is better?8 mhz or 20? did you also use double face pcb on 8mhz version?I think I will back again from the start..any way this display pcb I used..

The circuits are essentially the same. I went with the 20MHz one as it also has trimmers for adjusting gain. I used 16MHz

Output of sensor before diff 4,5-5,5V

[JHERICKU]

For those who want to try.
Enjoy it.

hello friend walkman,BC...c type transistors are not available in our locality..Can I use Bc...b type with this 20mhz design?What can u suggest if I will put the circuit on an aluminum box?does it affect its sensitivity?Also if I do mot have available 20mhz crystal,What value can I use?Did u manage to remove self oscillation?Thank u in advance..

[FrancoItaly]

I dont know who owns this pcb on display..I
This isthe one I have used but when I turn on the switch..the two leds lights continuously even I turn the potentiometer..Can any one help me..Thanks..

I am attaching the new display stage again, however if the sensor stage output is too high, the threshold cannot be adjusted, so it is necessary to decrease it.

[JHERICKU]

Hi friend,
Please read Francoıtaly 110.page #2732 in message; 20mhz component and help files

I used for frcanco 8mhz aluminum box.Very stable.

My youtube channel videos

https://www.youtube.com/channel/UCG36SfjYfTt48nJUI_lXauQ/videos

Good Luck.

Thank u friend walkman for the response..I only have bc...b type transistor..do u think I can make it successfull with with the 8mhz? also can I use different value of potentiometer?Does it affect the performance of the circuit?