Delta Pulse

[draco]

Hola a todos, hace un tiempo he terminado mi delta pulse, pero por la razón que sea, cuando lo enciendo está todo el rato pitando como si estuviese detectando un blanco superficial. No se lo que ocurre, el ground balance no pueo bajarlo y cuando subo el noise se calienta la resistencia R6 ( 680 Ohmios) y el IRF 740.
He revisado todo y aparentemente está todo bien. Solo consigo ajustar el ground balance cuando bajo de tensión la batería ( reóstato), pero en ese caso no detecto nada en la bobina.
La bobina es de 40x40 cms. con una resistencia de 4,3 Ohmios.

Pd: Jose, te había enviado un mensaje personal, pero supongo que no lo habrás visto. Es que al poner las traducciones en Google, puede no ser bien interpretado lo que quiero decir, por eso te pedí ayuda...
Gracias.

Hello everyone, a while ago I finished my delta pulse, but for whatever reason, when I switch it on is all the while whistling as if detecting a target surface. Not what happens, the ground balance pueo not download when I get the noise and heat the resistor R6 (680 ohms) and the IRF 740.

I've checked everything and apparently it's all good. Only adjust the ground balance it when low battery voltage (rheostat), but then I do not detect anything in the coil.

The coil is of 40x40 cms. with a resistance of 4.3 Ohms.



Pd: Jose, I had sent a personal message, but I guess you have not ever seen. Is that putting the translations in Google, can not be properly interpreted what I mean, that's why I asked for help ...

Thank you.

[draco]

The imagen...

[Jose]

Hello Draco
Excuse the delay in replying, I measured the voltage -E / TR9, check VD8 and VD9) if there are open.
Check +E and -E between 1 and 8, 1 and 4 of D6A (+5. Xx and-5.xx volts) Smaller P3 control not to overheat the IRF740
Best wishes

[draco]

Gracias José, Haré lo que me dices y te cuento.
Saludos.
Thanks Jose, I'll do what I say and I tell you.

Greetings.

[nelson]

Audio problem with my delta pulse

Hi, can anyone help me detecting an audio fail on a delta pulse.
I cheked IRF 740 gate, pin 1 of TL 062, the coli signal, pots signals, and frequency that is 120 hz, and all are working fine, but sound does not come thru the speaker or headphones anymore
This delta pulse is of a friend of mine, who pass it to me to try to repair the detector.
So now i need wher to look for.
In advance many thanks
Nelson

[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.

[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 ...

[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.

[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.

[kt315]

you must see a DC level.

[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]

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]

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.

[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]

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.