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Offline mickeu
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« Reply #150 on: January 21, 2011, 04:22:42 pm »
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I did a bit of research and another guy has similar problem

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http://www.md4u.ru/forum/viewtopic.php?f=5&t=3033
- nick HALNY

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Offline WM6
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« Reply #151 on: January 21, 2011, 07:41:54 pm »
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What happen if you take out MCP3201 or OP37 (alternately)?

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Offline mickeu
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« Reply #152 on: January 22, 2011, 02:55:17 am »
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WM6

In both cases gets quiet. i replaced them with the new ones yesterday but that wasn't the solution.

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Offline WM6
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« Reply #153 on: January 22, 2011, 05:20:46 pm »
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Quote:Posted by mickeu
WM6

In both cases gets quiet. i replaced them with the new ones yesterday but that wasn't the solution.


Then it can be something around OP37 circuit or power line vicinity. Did you try another PI coil - shielded one (shielding connected to ground)?

Check D7, D8, D6 (did you use for D6 and for D4 fast switch diode?).

Try to change R13 (use 200 E instead + 1k trimmer pot in series and slightly change its value from about 350 to 750 Ohm).

Change in the same way R25 from 500k to 1M Ohm.

As other possibilities you can change R16 to bigger value and check R21 and D9.

All this alternatively.

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« Reply #154 on: January 24, 2011, 05:15:48 pm »
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Mickeu
well you put the pins on the BS170?
BS170 pins D-G-S
KP505 pins S-D-G
I can not find datasheet for kp505, but in the Russian forum, someone put it.
sorry for my English

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Offline Mac_Gyver!
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« Reply #155 on: January 25, 2011, 12:21:08 am »
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Good morning, who sends me a slice of this plate?
I am not clear how to wrap the thread.
thanks

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Offline Mac_Gyver!
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« Reply #156 on: January 25, 2011, 03:46:47 am »
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the copper wire is wrapped as per figure 1 or Figure 2?

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Offline WM6
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« Reply #157 on: January 25, 2011, 06:21:50 am »
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Quote:Posted by Mac_Gyver!

the copper wire is wrapped as per figure 1 or Figure 2?



As per Figure 1.

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« Reply #158 on: January 25, 2011, 12:49:41 pm »
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Quote:Posted by mickeu
Hi guys

I build my one CHANCE and i got small problem, some strange signal rises even with unconnected coil, for me sounds like 50 hs power line interferences but i try in the field around 200 meters away from the "civilization" and i got still the same signals. just with barrier on level 16  gets bit better.

I think that can be something with receiver section, i used some replacement parts 2SC945 - BC182; КП505 - BS170; A733 - 2SA1015. Maybe BS170 is the problem?
This is link to my video, please have a look and give me some ideas what is going on.

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http://www.youtube.com/watch?v=5qZVRfqoaV8#noexternalembed


16 sec - shown unconnected coil plug
1.00 min - i connected the coil plug
1.30 min - sound similar to 50 hz power



Same problem to me any suggestions?

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Offline ppodg
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« Reply #159 on: January 29, 2011, 02:48:45 pm »
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Hi,

Does anybody know what's happened to Andy's homepage?
Trying to enter

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http://fandy.front.ru/Chance.htm
results in "entry prohibited" info.

Regards,
ppodg

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