complete project

[mschmahl]

Could you post the schematics of your setup? We can then use actual part numbers to work on solving the problems.

There are several possible causes that can combine to produce the problems you have.

What is your power supply?
What is your total coil and Mosfet resistance? The total resistance, TC, BU, cable and Mosfet and the cycle frequency, condition the consumption of the TX power.

I believe you have a big coil for searching deep targets. The TX timing is designed for that.
The TX timing together with the flyback capacitor control the Flyback voltage. The Flyback voltage per se is not important, but must never reach close to the Mosfet avalanche voltage.

Are you using a PIC 16F690? We can also use different timing cycles for different coil sizes and target sizes.

Hello Tinkerer!

Here is the schematic. My power supply are 1,5 V AA batteries (2x4). TX coil resistance (with BU) is 0,5 Ohm.

Greetings mschmahl

[mickstv]

I made a couple of changes to my original circuit from post 334.

I've changed the wiring to the threshold control, previously I had it connected to +/- 5volts. Now one side of the pot is connected to 12 volts "TX coil common" and the other side to + 5 volts.

The other change I made was to move the CD4046 VCO input wire, it's now connected to the output of the third TL072CP. So pitch change now occurs at the same time as threshold is broken.

[Jose]

Mickstv, This scheme can produce, decendentes and acendentes tones, according to the polarity of the input signal and also increases the audio level?.
This is similar to a Goldscand 5, or TDI.
Please could give more information.
Thank you.
Jose

[smootH_1712]

Merhaba . bana pi lb dedektörü; lay bir dosya, şematik çizim, parça listesi, paket bilgileri gönderilsin mi? [email protected]

[Qiaozhi]

Merhaba . bana pi lb dedektörü; lay bir dosya, şematik çizim, parça listesi, paket bilgileri gönderilsin mi? [email protected]

Please read the forum rules-> Basic Rules of the Forums
and make your posts in English.

[smootH_1712]

Hello there . me pi lb detector; send a file, schematic drawing, track list, package information? [email protected]