Delta Pulse

[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

[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]

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]

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]

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

[perzo]

grandbalance

HI kt315 what is grandbalance in the metal detector pi and how do works?best regards

[poppy]

Dear friends,
Please help me with connections of Delta Pulse. I soldered all components but confused where to connect Speaker, Coil etc. Should points labeled B be short circuited? A too?
I have marked the points in the image
Thank you !

[mollax]

such

[poppy]

Thank you mollax !!
Any idea how this version of Delta Pulse differs from the newer one in post #1338 ?
Are there much improvements ?

[mollax]

Thank you mollax !!
Any idea how this version of Delta Pulse differs from the newer one in post #1338 ?
Are there much improvements ?

these two are the same circuit
There are other circuit manual tuning and lcd ports

[Uykusuz]

For Dijital Delta Pulse click to this link:
http://www.lugatek.com/forum/index.php?topic=150.0

PIM-2 is digital version of Delta Pulse

[szucs_g]

Hello All!

I'm new on this forum. I made the first DP by one sided PCB form. The test was fatal. T the first starting the DP cray like a canari and not detect any metal. Today I turn on and not make this effect but not detect.

I have a coil with 400 uH.

Please help me! (Sorry for my bad english! Hungarian perfect. :-) )

[szucs_g]

Today I make one probe. Started shrieking on a high pitch after starting the apparatus. Then nice and slow gave up this sound. I heard only a change of click. After a rough setting the metal-detector from 2 centimetres perceived something. He was rather strange. The clicking got stronger at the time of the removal of the metal object, calmed down at the time of an approach. The successor is my question.
- The 4538 at me 74HCxxx. (74 HC 4538
Dual retriggerable precision monostable multivibrator)
This you're good let me exchange it flat CD4538-ra? (CD 4538
Dual Precision Monostable Multivibrator)
- I read, that the let CDxxx be 4066, right?
- They are needed really the polymer capacitors?
I do not have an oscilloscope unfortunately, but if my trouble is not resolved with the exchange of the components I buy one second-hand.
Greeting happy DP for proprietors! :-)
The translation on-line a translator prepared his help, if not lifelike do not chide me... :-)

[porkluvr]

Your translator was somewhat garbled but I've seen worse. You cannot use 74HC4538 with power source greater than 6V, so must use CD4538 for DP.

I had trouble understanding your other questions... no polymer capacitors are needed, maybe you meant polyester (Mylar). What alternative would you want? Polyester (Mylar) are a good choice (better than ceramic) and are inexpensive.

Yes, use CD4066 but CD4016 maybe also work.

[DOOLEY]

evening porkluver,
poss also use a CD4098 , max 18V , recomended limit 16V , but still good.

same function and pin config as a 4538 but not classed as precision like the 4538, apparantly , funny , they still work well.

thought i'd chip in with another option.