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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > PI Designs & Deepseekers (Moderators: Eugene52, Cornelius) >

Help With Delta Pulse Problem

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GoldDigger1950

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	Re: Help With Delta Pulse Problem « Reply #50 on: June 13, 2012, 07:23:03 am »

6666, there are a lot of differences. Time will tell where they are and how they affect things.

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	Re: Help With Delta Pulse Problem « Reply #51 on: June 13, 2012, 10:03:42 am »

Hi 6666,

Yeah initially I have constructed the DP2. but i have burnt the IRF840 and 556 on it... I tried to fix it many ways but finally decided to build DP1 as i have seen some people building the DP1 successfully here. But unluckily it also failed and now I am trying to fix it. I am getting lots of ideas from experts like GD etc here. I dont know how long it will take me to fix it.. but this time I dont want to give up.

Regards
Viswanath M

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	Re: Help With Delta Pulse Problem « Reply #52 on: June 14, 2012, 08:37:27 pm »

Ok so its a DP1
can you please give a link to the construction information that you used to build your DP1 project
or attach the files.
thanks

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« Last Edit: June 14, 2012, 08:39:33 pm by 6666 »	Logged

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	Re: Help With Delta Pulse Problem « Reply #53 on: June 15, 2012, 01:34:14 am »

Hi 6666,

I have used the attached Layout file to solder the entire parts of my DP. But after GD's advice I have used the schematic which is attached in reply number 44.

Initially I thought that the parts placement diagram and the PCB diagram are all needed for constructing this machine. But when I had issue GD told me to compare it with the Schematic.

-Viswanath M

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There are 1 attachment(s) in this post which you can not view or download Please register for viewing them. Delta Pulse.LAY
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	Re: Help With Delta Pulse Problem « Reply #54 on: June 15, 2012, 03:51:40 am »

Ok thanks for the layout file
now we can compare apples with apples.

I have extracted the component layout from the file for a part of your pcb
what brand of bc546 trannies do you have ?

If you dont know what brand you have, have you tested any to determine the leg configuration.

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	Re: Help With Delta Pulse Problem « Reply #55 on: June 15, 2012, 05:39:28 am »

Hi 6666,

Yeah I have tested the legs using my multimeter which have NPN and PNP transistor testing feature(it gives BCE pinouts... and also I have followed couple of other methods which i saw on you tubbe.. MMtr in resistor mode and diode mode and all methods yielded the same results)... Another thing is I was not happy with the older transistors that I have replaced in my board.... so I brought new Philips transistors, now I will put them on the board which will make me confident atleast about the transistors.

-Viswanath M

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	Re: Help With Delta Pulse Problem « Reply #56 on: June 15, 2012, 02:13:32 pm »

BC 546 is CBE and they are all the same

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So many questions so little time

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	Re: Help With Delta Pulse Problem « Reply #57 on: June 15, 2012, 05:46:43 pm »

Getting the BC546's in the right way is a good start

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	Re: Help With Delta Pulse Problem « Reply #58 on: June 15, 2012, 06:58:08 pm »

good 6666
-----------------
Hi viswanathmarachi

Continue in this way step by step.
Follow all of the Previous discussion of.

from your photo check:-

error ------>all BC546 are Inversed.---->change--> by PH BC546 b or c as your Delta Pulse.LAY file .

r5=1k--->2.2k .

c1=15nf=153j .

c3=10nf=103j .

c4=1.5nf=152j .

c25=220nf=224j .

c28=100nf=104j .

work,,,,,,,:)

best time

j.

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	Re: Help With Delta Pulse Problem « Reply #59 on: June 18, 2012, 11:14:30 pm »

Xaiver,

I got confused when I saw the arrangement in the transistors that I bought. But now I have relaced them all by new Philips transistors.

6666,

Thank you for the diagrams they helped me lot.

Japanese,

I will check the values you have suggested and get back to you.

-Viswanath M

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