Delta Pulse

[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.

[Belief]

Hi KT315

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

Iman Boroumand.

[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.

[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

[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

[nelson]

Hi, i have checked sound connecting pin 7 via 10K resistor on +E=+12V, and i did not got any sound at all. For this i desolder T9 off.
Also i replaced 555 twice, pins 2 and 6 on 555 are connected, also replace bc557 and bc 556, and no sound.
I dont know were to look. The detection stage is working and the only problem is that sound does not come thru the speaker. I also replace the speaker, IRF 740, look for unsolder tracks or parts, but still have the problem.
So, any help to see were is my problem.
Regands
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.

[lari]

Hi, i have checked sound connecting pin 7 via 10K resistor on +E=+12V, and i did not got any sound at all. For this i desolder T9 off.
Also i replaced 555 twice, pins 2 and 6 on 555 are connected, also replace bc557 and bc 556, and no sound.
I dont know were to look. The detection stage is working and the only problem is that sound does not come thru the speaker. I also replace the speaker, IRF 740, look for unsolder tracks or parts, but still have the problem.
So, any help to see were is my problem.
Regands
Nelson

For me it also happens with delta pulse, audio does not work completely or poor, no matter what I think is incorrect and that the PCB only one here know where the error but they will not help me from an unknown reason
Hello

[kt315]

Nelson, with T9 soldered you must get a sound in any THRESH tuning position, I think. try reconnect that I did draw here and you must hear a sound. decrease R44 value to 20-33 Ohms. desolder R45 too. also check R46 - it must be 2-2,2 Ohms.

[apocalypto]

PLEEEEEEEEEEEEEEEEEEEEESE HELP ME PROBLEM DELTA PULSE

I finish the making of delta pulse, I tested it..................nothing [angry]

- Battery : 12V 2.3 AH

- Serach coil : ø25 cm, 30 turns of 0.5 enemable CU

- Volume capacitor (100 ohm) not assembly

Results :

- Nothing.
- IRF 740 Heat in 5 min working.
- very Low noise from Coil search

[apocalypto]

And Resistor parallel to coil serach = 2.2 K 1 W

[apocalypto]

NO light from VD16 (Labeled Charge) Please help me

[apocalypto]

This is some pictures of my delta pulse, please help me

[apocalypto]

battery specifications, please help me

[SIBI]

poor detection

Hi guys!
Indoor detect DP very well, but outdoor in clean place without metal object is detection poor I have 1*1M coil, wire 0.7 dia and 16 turns. I played with dumper rezistor, but with no big efect. Sorry for my english, i´m Czech

[apocalypto]

Please help me

I measured the voltage +E and -E between 1 and 8, 1 and 4 of D6A (+5.xx and-5.xx volts)

Best wishes

Please help me