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Offline Timc
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« Reply #80 on: June 04, 2016, 07:28:46 am »
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Sorry Bernte, I never got a notification on this thread. The Pirate was OK, but becomes unstable- obviously the parameters need some serious adjusting. If someone has the ability or inclination, perhaps they could fine-tune this 8 pin ic design?? In the meantime I now have KD157DA1 chips from Georgi, so I will have a go at the original, but with delay and length adjustments. But before that I have a list of to-do's as long as my arm, including Arado 120B, Falcon MD20, LX765, Diablo, Sascho IB, Mini, 2BoxTR. etc. I got the last 3 resistors for my Baracuda this week, and have repaired a Compass Yukon 94B I got off Ebay not working- What a pleasure to work on! Slightly better on Gold than my Judge5, which I am growing to love.
My Hantek 6022 scope should arrive soon also.

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« Reply #81 on: August 31, 2016, 11:08:30 am »
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  Found more info on the Improved Russian Pirat PI.  Think I'll have a go at one.  Need to scare up some Clad for the PCB and the op amp.

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Offline bernte_one
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« Reply #82 on: August 31, 2016, 04:12:34 pm »
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you can throw whole pirate concept to garbage and all its substitutes

i build a least five version, put in in the garbage and finish this thing

attached my last try

Posted on: August 31, 2016, 04:11:15 pm
sorry has problems to upload gif?


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my machines at work http://mueller-meteoriten.de

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I CAN MAKE PCBs FOR YOUR DIY PROJECT  offer only within EU
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« Reply #83 on: August 31, 2016, 06:36:53 pm »
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Said piss on it and ordered the parts to make two.  You know me, I can mess up about any thing.  Still looking for some PCB clad.

Posted on: August 31, 2016, 06:22:02 pm
Bernte Did you build this version ? 

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« Reply #84 on: September 01, 2016, 09:08:29 am »
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latest working version

but you have exactly to meet the coil parameters (resistance and inductivity)
or you can throw all away after some minutes of power on - it will all burn :Smiley

no chance to experimet with other coils, and performance is poor

i think for half an hour of more work you can make blind squirrel pi if you like detector with clicking and howling detection sound

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I CAN MAKE PCBs FOR YOUR DIY PROJECT  offer only within EU
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« Reply #85 on: September 01, 2016, 09:58:42 am »
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  I see quite a lot of changes in that version along with the TL072 / TL082 .

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« Reply #86 on: September 01, 2016, 04:21:09 pm »
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Yes that is the one I made too, but will go back to the KD157 version I think.
My last post seems to have disappeared...
A version with CMOS and full variables would be worth trying.

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« Reply #87 on: September 01, 2016, 04:27:00 pm »
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Which one is the KD157 version ?



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« Reply #88 on: September 01, 2016, 04:52:50 pm »
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K157DA1 sorry.
Some other versions for you to ponder. I have noticed some fail to invert the second op-amp stage-this may be the cause of some sensitivity issues?

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« Reply #89 on: September 01, 2016, 05:01:11 pm »
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Think I'll just play with the one I posted.  Parts are on the way. Bought enough to make two.  If it's a dud I just have some stock for the parts bin. 

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