ETI 1500 mod

[cko47]

Hi!
In this circuit (ETI-1500) the sound does not work correctly. I have connected bases of transistors Q5 and Q6 to their emitters through resistance 150om. It has improved a sound slightly. But power weak.
And power supply have not exact 5v and 10v (is 5.6v and 11.2v). May be the reason is in ZD1 at 5.6 v. Must be at 5.1 v?
Who knows the reason? Send me answer to my email [email protected]. Thank You.
igor

[cko47]

schem for ETI 1500 (sound & power)

This is diagramm

[WM6]

Hi!
In this circuit (ETI-1500) the sound does not work correctly. I have connected bases of transistors Q5 and Q6 to their emitters through resistance 150om. It has improved a sound slightly. But power weak.
And power supply have not exact 5v and 10v (is 5.6v and 11.2v). May be the reason is in ZD1 at 5.6 v. Must be at 5.1 v?
Who knows the reason? Send me answer to my email [email protected]. Thank You.
igor

If you start Question in public then we all expect answer given in public too, not in PM. Such discussion are of general interest.

Do all as in schematic. Schematic is ok. Try at first C20 again, contact/pole orientation, value of capacity, C voltage value according part list, maybe it is faulty. Then we will see how further. Probably it is not supply problem. If you use headset connector check R50 on heating warming (wrong value, wrong connected). If you have a scope try signal at both side of C18 and at basis of Q5/Q6.

[cko47]

Thank for the answer.
I tried to change С20 up to 470 mkF. It has improved volume of a sound slightly. But one feature. When I turn off a sound supply (9v)that volume of sound is increased by short time. (at the charge of the capacitor).
But I have not received the answer according of voltage in a power supply. Other circuit (Micronta 4003) have voltage 5,6 v and 11,2 v (at the same circuit of a power unit as ETI 1500 or Shadow).
Oscillogram on the generator (ETI 1500) has amplitude only 1,5 volts (and in the instruction is shown 10 volts). The circuit of the generator of Micronta4300 is identical to the circuit ETI 1500. How is reason?

[kt315]

buy chinese MD-5008. it is Shadow & ETI-1500 on one whisky bottle. very good perfomance in All Metall mode and not so expensive.

[cko47]

I checked the circuit uses oscilloscope and has seen that the amplitude of a generated signal is equal 1,5 volts. Should be about 10 volts. Probably therefore this detector a little is sensitive and has not the large depth of detecting of metal.
The authors were not interested in this and other circuits in good parameters of detecting.
I was convinced of it when has bought a kit for the metall detector. Long time I tried to search with this detector (IP). But the results were insignificant. Only recently I have learned that the circuit was so adjusted by the author to not see gold Pulse delay was very long.
I wrote that the sound in the ETI1500 does not work correctly. In other circuit (Micronta) it have changed. Though I receive the answer that the circuit is correct.

[cko47]

For KT315
Do You have this schematics? Upload it. For me price is not cheap. May be when i find some gold nuggets ....
But while I found only pyrites(hundreds), old cartrige-case and shrapnel from 1 World War. Has found an old leaden coin. But it is very much tattered and on it almost nothing is visible.

[porkluvr]

Hi!
In this circuit (ETI-1500) the sound does not work correctly. I have connected bases of transistors Q5 and Q6 to their emitters through resistance 150om. It has improved a sound slightly. But power weak.
And power supply have not exact 5v and 10v (is 5.6v and 11.2v). May be the reason is in ZD1 at 5.6 v. Must be at 5.1 v?
Who knows the reason? Send me answer to my email [email protected]. Thank You.
igor

Your sound being weak probably is because the TX voltage is weak. Don't play with your audio. Concentrate on the source of the problem.

Your 5.6V and 11.2V are perfect.

Did you measure the output frequency? If not correct (about 15kHz ~16kHz) that will be an important clue. What is resistance reading for TX and RX coils?

Do yourself a favor and put the audio section back the way it was. Then, FOCUS on your transmitter problem.

Here you can find the ETI1500 article.
http://www.geotech1.com/cgi-bin/page...e=projects.dat

You will also see the Magnum article. Those detectors are identical in many respects, and the Magnum article has instructions for winding an appropriate coil. That may be good to know.

[baht7]

TX RX eti1500

anyone know the TX RX Freqs for the eti 1500

[porkluvr]

anyone know the TX RX Freqs for the eti 1500

You really should read.

On the first page of the article it lists the transmit frequency as 15~20kHz. It seems like they could pin that number down a little closer but it would depend on the coil you use. If you can't get the specified Altek coil but wind your own, then you would shoot for a transmit frequency somewhere in that range.

The receive frequency is naturally going to be same as transmit although the receiver would probably be offset tuned, either higher or lower (I'm not sure which) to give more predictable target phase response.

I just noticed from page 4 of the article that the transmit coil is one continuous winding and the receiver coil is split into main and buck windings. That's OK but most other IB detectors have it is the other way around. Very interesting.

If you choose 17,5000 to be the transmit frequency you would want about 1.92mH for the transmit coil.

[baht7]

eti 1500 TX RX Freq

Thxs Guru.
I am reading the material.
U answer is spot on.

[salih]

I collected Shadow metal locator with (Magnum coil) And I can tell Shadow same like ETI1500.
I Made object Circular Of copper like gold nuggets Diameter 5mm.

Test results in air for object Of copper 9cm Inside the ground 6cm.
Coin Diameter 2.2cm Test results in air 23cm.

Greetings
Salih