Delta Pulse

[Jose]

Hi Jose,
Thank you very much; I made the changes you've suggested but the result is almost the same...
Both during the swinging action of the coil during the search and even touching the cable near the rear plug I get strange behaviour. Mainly it sings...
The only solution I found is to increase the threshold.

Ciao

Hello Noemio
Another cause of instability may be that the coil to which we must add laps.
Also a faulty PCB with high resistance on the slopes, I had to reinforce some tracks with copper conductor to solve the problems of amplifier noise in the front.
Sorry, I do not speak English, only the translator,
Best regards

[Noemio]

Hello Noemio
Try the following
To ground the front panel and aluminum rear (+).
RG59 mesh must be connected to ground (+).
Shorten and twist the conductors between the plate and the connector of the coil

Saludos, Jose

Hi Jose,
Thank you very much; I made the changes you've suggested but the result is almost the same...
Both during the swinging action of the coil during the search and even touching the cable near the rear plug I get strange behaviour. Mainly it sings...
The only solution I found is to increase the threshold.

Ciao

[nelson]

Thanks kt315.
Yes DP now has a sound without threshold. So what this means, that T9 is defective?
Nelson

Nelson, DP gives a sound in ANY STATE and any condition! either your PCB is with trouble or not. you have NOT A SOUND AT ALL. get a sound without THRESHOLD.

[Belief]

Hi KT315

what kind of wire you are used for 1*1 coil ?
please guide me.
Thanks...

Iman Boroumand.

[kt315]

You mean to remove from PCB T9 and then connect pin 7 of 555 to +12V via 10K resistor?
And what about threshold?
Sorry, but my english and electronics knolegment is very basic.
Regards
Nelson

Nelson, DP gives a sound in ANY STATE and any condition! either your PCB is with trouble or not. you have NOT A SOUND AT ALL. get a sound without THRESHOLD.

[nelson]

Muchas gracias Alexismex, la verdad que mi ingles anda cada vez peor y además mis conocimientos de electrónica son muy basicos.
Gracias y depues de reparar el delta pulse, quiero armar un detector para cañerias subterranes, sabes de algún circuito simple , donde el transmisor del receptor estén separados?
De anemano muchas gracias y estamos en contacto.
Saludos
Nelson

Hola Nelson
Si KT315 te dice de conectar a traves de una resistencia de 10K la pata 7 del 555, asi vas a comprobar que tu circuito audio funciona ....si funciona sera entonce el transistor que esta mal conectado o no sirve , Ok
Alexis.

[Alexismex]

Hola Nelson
Si KT315 te dice de conectar a traves de una resistencia de 10K la pata 7 del 555, asi vas a comprobar que tu circuito audio funciona ....si funciona sera entonce el transistor que esta mal conectado o no sirve , Ok
Alexis.

[nelson]

You mean to remove from PCB T9 and then connect pin 7 of 555 to +12V via 10K resistor?
And what about threshold?
Sorry, but my english and electronics knolegment is very basic.
Regards
Nelson

may be you have not 2 and 6 pins connected?

it is VERY oldest matter to say again and again to read forum... desolder T9 off, connect pin 7 via a resistor on +E=+12V. you must get a sound.

[kt315]

may be you have not 2 and 6 pins connected?

it is VERY oldest matter to say again and again to read forum... desolder T9 off, connect pin 7 via a resistor on +E=+12V. you must get a sound.

[nelson]

Ok i got the picture, but my question is , what componente should i check if there is no DC level?
On my test, the detector is working, but it has no audio. I replace 555 and the same thing.
Also i found the base of bc 557 that goes to threshold, unsolder, so i m thinking that may be this transistor is burn. What do you think. The transistor was solder, but still no sound.
In advance many thanks kt315.
kind regards
Nelson

you must see a DC level.

[kt315]

you must see a DC level.

[nelson]

Ok kt315, so what should i look for if there is now signal or voltage?
Regards
Nelson

Nelson,

stay o-scope probe in R37-R41 point. you must see some slightly negative noised level. if you bring a metal over the coil coil you must see INCREASE voltage level in the point. it is normal working state of DP.

[nelson]

Thanks kt315, i will try it this afternoon after work
Regrads
Nelson

Nelson,

stay o-scope probe in R37-R41 point. you must see some slightly negative noised level. if you bring a metal over the coil coil you must see INCREASE voltage level in the point. it is normal working state of DP.

[Belief]

Hi all refer to

http://megatekno.com/

http://megatekno.com/%DDndir-%28Download%29.php

I used this 125*125 coil with ADSL cable but IRF840 over heat

Thanks ...

[kt315]

Nelson,

stay o-scope probe in R37-R41 point. you must see some slightly negative noised level. if you bring a metal over the coil coil you must see INCREASE voltage level in the point. it is normal working state of DP.