Another Pin Pointer.

[chemelec]

Here are Some of the Coils I Made.

Bigger Diameter Ferrites Detect at Greater Distance.
Smaller Ferrites Detect at Less Distance, but More Accurately "PIN-POINT" the Exact Location.

Also the "Fine Chain" I used for testing.

The Output from this Pinpointer is Both Visual, With the LED and An Increasing Frequency from the Piezo.

The Closer the Object, the Higher the Frequency of the Tone.
(From a slow "Beep, Beep", To about a 1 khz continuous Pitch.)

[WM6]

Bigger Diameter Ferrites Detect at Greater Distance.

What is your suggestion for wire (diameter) used?

[chemelec]

What is your suggestion for wire (diameter) used?

Not Critical, But I used a 30 AWG on most of them.


EDIT:
Another Thing to Note:
On that Bobbin with the 12 mm Core, L1 is 1 mH and L2 is 80 uH.
It Requires a Lower Total Resistance on the Pots and 2K2 resistor.
So that 2K2 Resistor needs to be just a Jumper Wire.

I only Added in that 2K2 Resistor so I could use Lower value Pots to make tuning Easier.
If Wanted, You can Totally Bypass it.

[chemelec]

Using that Black Colored Coil with the 3 mm core that I Posted earlier, It Easily detects that Fine Chain at just over 1 Cm.

And this Detector Holds Quite Stable.
I only used Trimpots on the PCB, because I don't have any Low Value Pots below 1K.

A 500 Ohm, 10 Turn Pot would be Really Good for the Fine Adjust.
Or Bypass the 2K2, use a 10K Coarse Adjust and a 100 Ohm Fine Adjust.

I Don't have any need to have a Pinpointer like this.
I Like PLAYING and this was Just a Curosity to see what Sensitivity I could obtain.

[satdaveuk]

Hi
Ready resized to scale 1:1
Just open file and in your printer settings click print to actual size or print to original size, Not as default which is normally fit to page.
Graphic printer settings tick (1) best quality , (2)black and white,(3) darkest setting, (4) toner saver off.
Maybe worded different but basically you want as much toner deposit as possible.

[walkman]

Hi;
Ready resized to scale 1:1

[sinclairuser]

Hi
Ready resized to scale 1:1
Just open file and in your printer settings click print to actual size or print to original size, Not as default which is normally fit to page.
Graphic printer settings tick (1) best quality , (2)black and white,(3) darkest setting, (4) toner saver off.
Maybe worded different but basically you want as much toner deposit as possible.

thanks dave, saved me a job, i dont make a lot of boards these days, for "proper" projects i like factory made boards like silverdogs.
for small stuff like this i print direct onto photo resist, for my amp projects my work makes my boards for me @60% discount, saves messing around, another cheap trick ive done for small stuff is to direct print onto perf board install components then join the dots.

[chemelec]

Hi;
Ready resized to scale 1:1

Just out of Courtesy, If your going to Copy my PCB that is Copyright by me, You should also put my Logo and copyright info on it.

Gary

[walkman]

[= Chemelec QUOTE; 186584] Sadece Nezaket dışında, senin benim Copyright benim PCB kopyalayın gidiyor, sen de o benim Logo ve telif hakkı bilgileri koymak gerekir. Gary [/ QUOTE]



I just redraw the work you do. Copyright yours. Nothing out of courtesy in the middle.: Nono:

[satdaveuk]

That's a good Idea using perforated board must remember that one useful for making small circuits

[IBGold]

Hi Garry,

Do you have the pin out voltages for the transistors and 555 for trouble shooting as I am having trouble getting mine to work the only diference on mine is I used multiturn pots and the coil's are wound on a piece of 10mm diam. ferrite rod as that was what I had in the junk box with out power connected and with the 5K pot set at 2,5K and the 200 ohm pot set at 110.2 ohms the peizo sounds off but nothing with power conected.

Regards, Ian.

[chemelec]

Hi Garry,

Do you have the pin out voltages for the transistors and 555 for trouble shooting as I am having trouble getting mine to work the only diference on mine is I used multiturn pots and the coil's are wound on a piece of 10mm diam. ferrite rod as that was what I had in the junk box with out power connected and with the 5K pot set at 2,5K and the 200 ohm pot set at 110.2 ohms the peizo sounds off but nothing with power conected.

Regards, Ian.

I Doubt Those Voltage Measurements will Help you.

First Measure the Voltage Across the .001 Cap at the Output of the Diodes.
If you have NO Voltage there, Your Oscillator is NOT Oscillating.
Are your Inductance Values Close to my values?
(If No Voltage, Check Polarity of Coils.)
Possibly Reverse Just One and Try Again.

Gary

[chemelec]

Hi Ian, I Believe your in Australia.
If you have a "LAND BASED PHONE", I can call you toll free to discuss this.

Gary

[IBGold]

Hi Gary,

The voltage across the cap is .17V the inductances are with in 1 or 2uh they were perfect when I hooked it up and I am pretty certain that they are the correct way round I am inclined to think one or both the transistors may be out as I inadvertantly hooked it up wrong way round on first attempt when it did buzz all the time I replaced the 555 and hooked up the battery corectly so trying to find what is cooked the 2N 3904 has voltages on the pins but the 2N5088 does not you know you have to let the smoke out at least once on a project Hi.

I can PM you my landline number if you prefer.

Regards, Ian.

[chemelec]

Hi Ian, Is your 5 Volt Regulator Still OK?

Voltage at the cap should be about 0.6 Volts with NO Metal Present.
As Metal Approaches the Coil, This Voltage goes LOWER.

With No Metal Present, Voltage at Collector of the 2N5088 is about 4 Volts.
As Metal Approaches coil,This voltage RISES, possibly up to about 7 volts.
Depends on Actual Battery Voltage.

If you PM or Email me your Number, I can call you.
Re: Time Difference, Are you East Coast or West Coast?