MODIFICATION,CIRCUITO, FREQUENCES??

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	MODIFICATION,CIRCUITO, FREQUENCES?? « on: November 03, 2009, 05:38:59 am »

there is someone who specializes Teach

in incorporating in the circuit, metal detector (pi) with 2-freq. 600 hz and 1200hz(

ONLY TO THESE TWO)
.has acquired, 450hz, 950 hz.?(500,FREQ.!) is possible? I send to her, e-mail, schema, ok? send your email.

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	Re: MODIFICATION,CIRCUITO, FREQUENCES?? « Reply #1 on: November 06, 2009, 01:16:44 pm »

	Quote:	Posted by carlrod
there is someone who specializes in incorporating in the circuit, metal detector (pi) with 2-freq. 600 hz and 1200hz( ONLY TO THESE TWO) .has acquired, 450hz, 950 hz.?(500,FREQ.!) is possible? I send to her, e-mail, schema, ok? send your email.

Hello . If I understand your question or statement correctly you can use a switch to select between 2 fixed resistance values and [you must have an oscilloscope] to verify and set the potentiometer exactly to 450 or 900 pps . Then turn off power and read the resistance value of each frequency then add a switch, solder each resistor to the switch and then you have just have 2 or 3 wires going to the circuit board instead of the potentiometer or variable resistor . I am sure you can do this . If the oscillator is stable with no drift then you will always know your exact pulse frequency .
HH.......Eugene

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	Re: MODIFICATION,CIRCUITO, FREQUENCES?? « Reply #2 on: November 12, 2009, 04:58:12 am »

hello to everyone, friends of the forum. someone even understood in the scheme (metal detector, PI) to give me the following advice: I have a model detector, which has ,2-frequencies: 600 Hz and 1200 Hz., has a switch on the front, which I can only have one or another frequency (2-positions)
out another model, same manufacturer, which has (multi-frequencias. .. 400 freq., of: 550 Hz, 950 Hz., and has a potentiometer to regulate these 400 freq. I asked, and sorry for my Ingenuino! is possible, I also applied 1-potentiometer in place of the panel, instead of (SWITCH) and connect the same 5-wire connecting ma plate, and so, stick with 600 frequencies, instead of the two, 600e 1200Hz? ?? without changing any components on the board?
might eventually change, with a potentiometer, especially, have, too: From: 550Hz, 950 Hz? thanks for the possible, help
CARLOS (PORTUGAL)

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	Re: MODIFICATION,CIRCUITO, FREQUENCES?? « Reply #3 on: November 12, 2009, 05:59:48 am »

	Quote:	Posted by carlrod
hello to everyone, friends of the forum. someone even understood in the scheme (metal detector, PI) to give me the following advice: I have a model detector, which has ,2-frequencies: 600 Hz and 1200 Hz., has a switch on the front, which I can only have one or another frequency (2-positions) out another model, same manufacturer, which has (multi-frequencias. .. 400 freq., of: 550 Hz, 950 Hz., and has a potentiometer to regulate these 400 freq. I asked, and sorry for my Ingenuino! is possible, I also applied 1-potentiometer in place of the panel, instead of (SWITCH) and connect the same 5-wire connecting ma plate, and so, stick with 600 frequencies, instead of the two, 600e 1200Hz? ?? without changing any components on the board? might eventually change, with a potentiometer, especially, have, too: From: 550Hz, 950 Hz? thanks for the possible, help CARLOS (PORTUGAL)

It seems to me, if I understand correctly, if you replace one of the resistors with a pot, you can have a smooth range of any frequency you want. I would say, make the pot a bit smaller than the biggest resistor, and to keep from going too high, in frequency, put the same value, as the smallest resistor, in series with the pot. It will now go from the smallest value to just over the largest value.

How does that sound to you, am I making sense? I will try it a simpler way: replace the resistor, in one switch position with a pot equal to: largest resistor minus smallest resistor. Place a resistor equal to the smallest, in series with the pot..... it now equals the largest, at maximum, and goes from smallest to the largest.

This way you get the whole range, BUT, is there an advantage?

goldigger

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	Re: MODIFICATION,CIRCUITO, FREQUENCES?? « Reply #4 on: November 12, 2009, 09:03:16 am »

	Quote:	Posted by goldigger
It seems to me, if I understand correctly, if you replace one of the resistors with a pot, you can have a smooth range of any frequency you want. I would say, make the pot a bit smaller than the biggest resistor, and to keep from going too high, in frequency, put the same value, as the smallest resistor, in series with the pot. It will now go from the smallest value to just over the largest value. How does that sound to you, am I making sense? I will try it a simpler way: replace the resistor, in one switch position with a pot equal to: largest resistor minus smallest resistor. Place a resistor equal to the smallest, in series with the pot..... it now equals the largest, at maximum, and goes from smallest to the largest. This way you get the whole range, BUT, is there an advantage? goldigger

Hello Goldigger . Your way sounds easier than mine , I think Carlrod does not want to turn a potentiometer , he just simply wants to flip a switch . Another possible idea is have the option of both fixed and variable frequency ?
Regards............Eugene

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	Re: MODIFICATION,CIRCUITO, FREQUENCES?? « Reply #5 on: November 12, 2009, 07:42:50 pm »

	Quote:	Posted by Eugene52
Hello Goldigger . Your way sounds easier than mine , I think Carlrod does not want to turn a potentiometer , he just simply wants to flip a switch . Another possible idea is have the option of both fixed and variable frequency ? Regards............Eugene

Personally, I would like both options... the only complication I thought of (and decided to ignore it) was that the switch may be switching other circuits, as well (multiple decks). In that case, the pot idea would not work, at all.... ?

No reply yet, and fortunately my Portuguese is very limited.... I do not know how his Spanish is, also.

My Portuguese vocabulary is barely more than 3 words: nome meu and sim. Grin

Nome meu = Mi nombre es...

goldigger

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	Re: MODIFICATION,CIRCUITO, FREQUENCES?? « Reply #6 on: November 13, 2009, 04:58:44 am »

again. concluding, and even possible, replace, o.SWITCH,the potentiometer, own, and have 400 frequencies? 600 Hz to 1200 Hz, or better: 550Hz, the 950hz? which the potentiometer, indicated for one, and another case?

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