Ferrous and no-ferrous

[6666]

6666 Friend:
If I am willing to share my research with you, in this forum.
This forum really helped me a lot.
"It is well born to be grateful."
This is my experimental code for 16F873 micro.
Now (12:34 UTC) I'll eat. This later upload the schema.

Hi
Thank you for sharing your work
it looks interesting, and will have a close look at it.
6666

[6666]

How did you wire up the 2xBC556 ?

[kt315]

Dear kt315:


Translation from google-translator was confused.


I understand that some people have tried to discriminate metals with a PI and was not possible ..... (?)


I really do not know if it is possible or not, I am newbie-but I see the signals on the oscilloscope and gives me hope to get it.
With your permission I will continue investigating to figure out whether or not I'm able to get it.


I do not know exactly what happens with Minelab (?). My works are mine and unfoldment from 0. No person, firm or entity on this planet that prevents me from developing my own circuits. Jobs in I+ D for many years and I will not retire now.


Please use simple sentences kt315 me. Treat me like a baby for five years. I'm sure what you say is very interesting but the result of the translation is ambiguous and do not know if I interpret it correctly.


Receive a greeting and thanks for your answer.

yes, my english is geotechglish. yes my english is international english. yes my english is not native.
yes my language is a language of schematics more.

I ask you VERY demand to learn CHANCE schematic BEFORE you do anything. to learn Minelab patent related with Chance. may be even to build Cnance and to test BEFORE
you DO ANYTHING. Chance is PI machine with the discrimination. please Aziz translate my reply in the clear language of Shakespeare.
and yes I believe there must be a filling between your world of clear english of great country Spain and our of bad english.

[alber_gold]

How did you wire up the 2xBC556 ?

__________________________________________________ _________

It's easy.
Based to base, emitter to emitter and collector to collector.
I used this method for the construction of TX for 80-40 meters.
With 4 x BD 135 got 14 W cheaply.
It is better to use a higher power transistor instead of several in parallel.
The small advantage is that if one is damaged and is not shorted, the system continues to operate.
Again, not ideal. It is a "fudge" to get by.
A greeting.

[alber_gold]

yes, my english is geotechglish. yes my english is international english. yes my english is not native.
yes my language is a language of schematics more.

I ask you VERY demand to learn CHANCE schematic BEFORE you do anything. to learn Minelab patent related with Chance. may be even to build Cnance and to test BEFORE
you DO ANYTHING. Chance is PI machine with the discrimination. please Aziz translate my reply in the clear language of Shakespeare.
and yes I believe there must be a filling between your world of clear english of great country Spain and our of bad english.

__________________________________________________ ____________________


Hello again.
I appreciate the effort you dedicate me.
I studied French in school.
I'm too old and slow to learn new languages.
I am over 20 years with the English and have not mastered.
I understand diagrams and little else.
I will look at the issue of patents with Minelab.


Thank you very much for your words.
A greeting in españisglish.

[6666]

Hi alber_gold
would it be possible for you to please expand the circuit details in this part of the schematic ?
thanks

[alber_gold]

Hi alber_gold
would it be possible for you to please expand the circuit details in this part of the schematic ?
thanks

--


This is what was missing to explain.
Remember it is only TEST.
Not worth mounting. Just to experiment.
It is better to use the PWM output of the mic.
With the DAC output frequency to the 386 is very low and sometimes annoying.
.
.
.
In the other photo is a rectification. You have to connect either micro or he receives about 12 volts and does not like. :-)

Shift+R improves the quality of this image. Shift+A improves the quality of all images on this page.

[alber_gold]

Please, How Can I delete the code of #6.




It gives a bad image to the thread.
Below is an attachment.

Thanks for help.

[Qiaozhi]

Please, How Can I delete the code of #6.




It gives a bad image to the thread.
Below is an attachment.

Thanks for help.

You'll have to leave it there. It is not our policy to prune/tidy-up threads, and often the removal of certain posts will ruin the continuity of the discussion.

Remember, you have 60 minutes in which to modify any post you have made. After that it becomes part of the fabric of Geotech.

[alber_gold]

You'll have to leave it there. It is not our policy to prune/tidy-up threads, and often the removal of certain posts will ruin the continuity of the discussion.

Remember, you have 60 minutes in which to modify any post you have made. After that it becomes part of the fabric of Geotech.

.
.

ok thanks.


I did not know that.


It's a shame. The thread looks ugly.


a greeting.

.
.

[6666]

Hi alber_gold

Thanks for the extra information on your design.

6666

[6666]

You say that It is better to use the PWM output of the mic, does that function already work ?
or do you need to change the hex code ?

[alber_gold]

The PWM function does not work in the code attached. This code is a minimum and only to start the investigation. Sorry.


I comment in the thread that is better to use PWM and not use the weighted resistor DAC.


To use the PWM pin should be used RC2/CCP1. This for model 16F873.
That would connect the input pin 386.


If you set the PWM is confusing, you can catch the ADC value (only 8 bits for example) and create a function that delivers an output proportional to one pin of the PIC, for example pin RA, 0 (PORTA, 0).


It would be something like this:

__________________________________________________ ___________________________________

CONVERT ; We come up here with a CALL instruction.

movf ADRESL,0 ; only 8 bit of ADC . Before this value we sent it to PORTB.
movwf VALUE ; my register

movlw 0x00
xorwf VALUE,0
btfsc STATUS,2
RETURN ; if VALUE == 0 no sound. This can be adjust for a minium level. For example if ADC < .50 , no sound....(example)

bsf PORTA,0 ; Now PORTA,0 == 1 ( about 4,7 v when Vcc == 5 v )

BUCLE_AUDIO

call DELAY_x ; A delay because PIC works very speed and the audio signal is very slow

decfsz VALUE,1
goto BUCLE_AUDIO

bcf PORTA,0 ; Out off

RETURN ; if VALUE == 0 then finish ( We come from a CALL )

__________________________________________________ ____________________________________

This gives an audio frequency proportional to the value of the ADC.


This code is just an example to make experiments.

Sorry for my spainenglish. :-)

[alber_gold]

I have a doubt about the Surf PI.
Once I read the solution in this forum but now can not find.


I want to put an external potentiometer to adjust the DELAY.


Does anyone know how I should connect? Should I remove the 10K multiturn?


In the thread I read I remember that was connected in series with the multiturn but the truth is I do not remember.


Thank you.

[kt315]

I want to put an external potentiometer to adjust the DELAY.

for what? in original surf the delay pot is re-moved and uses like a pot for SAT tuning. the delay is fixed on 15us by multurn 50k R25, one time and on all life. this is Terry's mod.