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Offline raff33
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« Reply #250 on: March 08, 2010, 10:24:36 am »
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hi, thanks nikos for helping Wink
my DP work stable but poor detecting ,a canet koka 15 cm..........verry poor Embarrassed..........
with : R5=2.2k 1w ; R6=680R ; R23,24,25,26=4k7 5% ; D4=TL071 i didn't find LF357 ; C30=10.000uf.
coil=40cm diameter ,23tr ,0.50mm wire
i d'ont now how mesre resistance coil by my multimetre
iam new in electronic can any one gide me ..? sorry for my bad english and many thanks

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Offline mafarid
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stuart I
« Reply #251 on: March 08, 2010, 12:30:49 pm »
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Hi
Dear NIKOS,

I removed all parts of DP one by one rechecked and re soldered them but all showed true value.
Good luck,

Dear raff33,

Good job,
True coil of DP has 29 turns instead of 23 turns. For measuring of Ohm, set your multi meter on suitable Ohm metering mod then put one of your probes on one side of object and put other probe on other side.
Be careful about removing power supply before measuring of Ohm.
For example at your coil, remove coil from DP, set your multi meter on 1x Ohm mod then use probes.

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« Reply #252 on: March 20, 2010, 12:23:31 pm »
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i want make a 25cm coil with 0.5mm cu wire how much turns i need and i need shield coil or not

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Offline Eugene52Topic starter
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« Reply #253 on: March 20, 2010, 10:30:17 pm »
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Hello masons21 . The 0.5 mm coil information you need was already posted here several months ago . So I am looking for it again , right now . Anyway , the Delta Pulse is a Great Project built by many hobbyists all over the world . You made an excellent PI Project choice .

Best Regards..........Eugene
Try 30 to 36 turns on a 28 cm [11 inch] form with 0.5 mm wire and you should obtain 3.5 dc ohms coil resistance which would be perfect for the Delta Pulse . Remember that the original Delta Pulse factory search coil measured closed to 1000 uh inductance !!!!

Regards..........Eugene

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Offline raff33
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« Reply #254 on: March 21, 2010, 09:35:31 am »
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Hi Eugene,
my DP single side work stable but poor detecting ,a canet koka 15 cm..........verry poor .......... Cry
with : R5=2.2k 1w ; R6=680R ; R23,24,25,26=4k7 5% ; D4=TL071 i didn't find LF357 ; C30=10.000uf.
coil=40cm diameter ,23tr ,0.50mm wire ; 2.6 R
what's the probleme probably........?  many thanks
Regards..........raff33

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« Last Edit: March 21, 2010, 10:09:11 am by raff33 » 		Logged
Offline Eugene52Topic starter
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« Reply #255 on: March 21, 2010, 10:33:21 am »
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Quote:Posted by raff33
Hi Eugene,
my DP single side work stable but poor detecting ,a canet koka 15 cm..........verry poor .......... Cry
with : R5=2.2k 1w ; R6=680R ; R23,24,25,26=4k7 5% ; D4=TL071 i didn't find LF357 ; C30=10.000uf.
coil=40cm diameter ,23tr ,0.50mm wire ; 2.6 R
what's the probleme probably........?  many thanks
Regards..........raff33


Hello . The problem is you are using the old original Mikron Delta Schematic [blue-red color] , It has many errors . R5 2.2 k ohms is wrong , R5 is 680 ohm 1 watt . And R6 is 1 k ohm . Use the schematic I posted here today !!! R23,24,25,26 must be 1% tolerance . If you can not buy 1% then measure each with ohmeter and only use 4.7k before you solder in place . C30 and C31 Electrolytic filter capacitors should be 4,700 uf 16 volt minimum . Seach coil is ok but coil with 3 to 4 ohms dc resistance would be better . Please use latest schematic I have here !!
Regards...........Eugene

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Offline raff33
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« Reply #256 on: March 21, 2010, 11:25:34 am »
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Hi Mr Eugene52,
thank you for informations , i will doing this modification  Great

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Offline ameen
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« Reply #257 on: March 22, 2010, 06:41:33 am »
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Hello

We have built one, but it does not work. I hear a voice when running and then press reboot and the sound disappears and the device is not sensitive to the metals.
Is the resistance side of 740 should be 1 watt.
ne 556 heat
And also a warm 740
Can you help me
Forgive me for my bad English

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Offline BR*simonn
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« Reply #258 on: March 22, 2010, 05:39:37 pm »
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Hello my friend. Sorry about my bad english, ok? I see the Delta Pulse Metal Detector on Youtube. It's very interesting. Do you know somebody that has the PCB with the components to sell? Thank you. Claudio

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Offline gocman
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« Reply #259 on: March 24, 2010, 02:59:29 am »
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u must to find lf357 i thing. I try with all i have op's but LF357 is the best for me Cry

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