Delta Pulse

[silver]

Yeah but see the point I was trying to get across is that a picture like what I uploaded is very valuable as a troubleshooting aid.

So, if you decide to go troubleshooting your dead Deltapulse, don't you want to have all possible troubleshooting aids at your disposal?

Well?

Good hunting!

edit: If you can't find the correct trace diagram you can still turn the board over and look at the bottom as you chase different signals for troubleshooting. But, it is a little easier if you have the picture to look at. Less gray hair is generated.

It's just a single layer board so it shouldn't be too hard to find the problem. Even though my picture is not exactly right it might be better than nothing.

Hi
thanks for help, i am trying to find where is the problem, but it is a little bit hard to me
but i am going ahead, i can find one capaciror that was damaged, i am trying to find others.
best regards my friend

[porkluvr]

Yeah but see the point I was trying to get across is that a picture like what I uploaded is very valuable as a troubleshooting aid.

So, if you decide to go troubleshooting your dead Deltapulse, don't you want to have all possible troubleshooting aids at your disposal?

Well?

Good hunting!

edit: If you can't find the correct trace diagram you can still turn the board over and look at the bottom as you chase different signals for troubleshooting. But, it is a little easier if you have the picture to look at. Less gray hair is generated.

It's just a single layer board so it shouldn't be too hard to find the problem. Even though my picture is not exactly right it might be better than nothing.

[silver]

Alright, one other possibility I left out was a missing jumper.

If I understood your first post correctly, you should stop thinking about
replacing parts and instead start tracing wires on your PCB.

Get out your schematic diagram, look at where you have +E and -E and where you don't, and then narrow down the defect.

If you have a PCB trace diagram showing traces and jumper placement, that would be helpful in tracing the power loss.

Is this the right one?

Hi
no, my first delta is what you uploaded, that work just fine, but my second delta that i have some problem is this:

[porkluvr]

may be i must change all 1n4148 and test again.

Alright, one other possibility I left out was a missing jumper.

If I understood your first post correctly, you should stop thinking about
replacing parts and instead start tracing wires on your PCB.

Get out your schematic diagram, look at where you have +E and -E and where you don't, and then narrow down the defect.

If you have a PCB trace diagram showing traces and jumper placement, that would be helpful in tracing the power loss.

Is this the right one?

[silver]

Your problem as you describe it points to a bad solder connection or open (broken or burned) trace. I say that because 12V is the same power source all over the board. If you have 12V everywhere else but don't have it at the 556, well, what else could it be?

Whip out your multimeter, PCB layout and schematic diagrams, magnifying glass, and use your eyes!

Hi porkluvr
there is not any bad solder conection but may be some broken or burned, this is my problem that how find them? may be i must change all 1n4148 and test again.
ok, i am going to solve my problem, but please don't leave me alone.
best regards

[silver]

other help for you .
I remember there are good instruction with two language English / Persian in this
Thread , uploaded by Qiaozhi . Also read carefully KT315 and ivconic messages .

yes, i read that, and i read all of this thered, only one question; how i can test transistors and diods and capacitors on board with multimeter? and i must change all of the ICs or not?

[silver]

Hi Silver
and hi to(Cyrus_ cilinder) great king korosh
as you said , you are beginner in electronic circuits ,delta pulse is complex project .
replace irf840 , add series fast fuse 500 ma with battery . coil DC resistance must be not lower than 3 ohm . without oscilloscope repairer not easy . I hope you haven’t other problems with delta pulse .

thanks a lot dear aft, i will do what you say, and i will post the result.
many thanks

[porkluvr]

...when i test IC's legs with multimeter, all of leg's voltage was 12 or 13 volt but only ne555 had some 5 volt.

Your problem as you describe it points to a bad solder connection or open (broken or burned) trace. I say that because 12V is the same power source all over the board. If you have 12V everywhere else but don't have it at the 556, well, what else could it be?

Whip out your multimeter, PCB layout and schematic diagrams, magnifying glass, and use your eyes!

[aft_72005]

Hi Silver
and hi to(Cyrus_ cilinder) great king korosh
as you said , you are beginner in electronic circuits ,delta pulse is complex project .
replace irf840 , add series fast fuse 500 ma with battery . coil DC resistance must be not lower than 3 ohm . without oscilloscope repairer not easy . I hope you haven’t other problems with delta pulse .

other help for you .
I remember there are good instruction with two language English / Persian in this
Thread , uploaded by Qiaozhi . Also read carefully KT315 and ivconic messages .

[aft_72005]

Hi forum
yesterday i had finished my new delta pulse, but i was wrong solder the mosfet and ne556, so when i connect the bettery, i see afew smoke on mosfet area and delta died, when i look the smoke area, i see that two 1n4148 (VD8,VD9) is broken, i changed those and i use new 556 but since i have not new IRF840, only i turned it 180 degree ( true position) and connect the battery again; there is very very low sound in speaker and when i test IC's legs with multimeter, all of leg's voltage was 12 or 13 volt but only ne555 had some 5 volt.
i was not use coil.
this is my second delta and firs one work well. my electronic not so good so please help me to solve my problem. any info will be great help for me.
thanks in advance

Hi Silver
and hi to(Cyrus_ cilinder) great king korosh
as you said , you are beginner in electronic circuits ,delta pulse is complex project .
replace irf840 , add series fast fuse 500 ma with battery . coil DC resistance must be not lower than 3 ohm . without oscilloscope repairer not easy . I hope you haven’t other problems with delta pulse .

[silver]

please help me

Hi forum
yesterday i had finished my new delta pulse, but i was wrong solder the mosfet and ne556, so when i connect the bettery, i see afew smoke on mosfet area and delta died, when i look the smoke area, i see that two 1n4148 (VD8,VD9) is broken, i changed those and i use new 556 but since i have not new IRF840, only i turned it 180 degree ( true position) and connect the battery again; there is very very low sound in speaker and when i test IC's legs with multimeter, all of leg's voltage was 12 or 13 volt but only ne555 had some 5 volt.
i was not use coil.
this is my second delta and firs one work well. my electronic not so good so please help me to solve my problem. any info will be great help for me.
thanks in advance

[Jose]

hello people call me nataildo (measure), I am new to this forum and would like someone you take away a doubt.
I set up a metal detector delta pulse rx-71 100% it works, but I'm wanting it to detect small nuggets
gold I've done some testing with multiple coils made by me only wanted to ally this distance and not interference from the ground. now thank you

Hello Didarpm
Pulse Delta was not designed to detect gold nuggets. You can experiment with fast driving coils and decrease the delay time to improve the detection of coins.
There is much information in the forum as coils and decrease the delay time in the DP.
regards

[didarpm]

hello people call me nataildo (measure), I am new to this forum and would like someone you take away a doubt.
I set up a metal detector delta pulse rx-71 100% it works, but I'm wanting it to detect small nuggets
gold I've done some testing with multiple coils made by me only wanted to ally this distance and not interference from the ground. now thank you

[ossamaussama]

take alook about this

[ossamaussama]

I am experimenting with this circuit to slightly increase the tension of 7909.

nice work kt315


i was think that the voltage between E+ and E- should be so stable and requlated

and i was think to make circuit that provide -10.6 by 555 TIMER AND voltgae multipler

and requlator

so if battery fall from 12.5 to even 11.6 volts this -10.6 still stable

because 555 timer can be used give -20 volts from 12 volts and then we regulated -20 to -10.6


i copy this idea from pulse star power supply circuit

pulse star use requlated power
i will post schematic soon

i have question





my question to any one have scope to see if there is noise from LM556 in the e+ and e-

and ground?