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Originally posted by perkun View PostGB pot. is connected to pin 6 Lm324. should go to pin7.
Yes you are right, according to schematic it is mistake, made by me.
Funny thing is that i made few detectors on such pcb's and those worked just fine!??
I hadn't any problem to adjust GEB or Disc!?
I remember only that audio was slightly weaker than on original, everything else was quite alright.
Very confusing?
I will have to compare it again with original...
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Originally posted by perkun View PostSay something about balancing the coil.
I did DD27 balanced to 100mV.
When switch to 18khz jumps to 900mV.
In original GM4 U1 is a TL074?
On some models there is TL074 and on some models there is LM324.
About balancing the coil; read Andy Flind's article.
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Originally posted by perkun View PostSay something about balancing the coil.
I did DD27 balanced to 100mV.
When switch to 18khz jumps to 900mV.
In original GM4 U1 is a TL074?
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Originally posted by perkun View PostSay something about balancing the coil.
I did DD27 balanced to 100mV.
When switch to 18khz jumps to 900mV.
In original GM4 U1 is a TL074?
Also it is important to know that any set of windings that are balanced first at low frequencies depending on particular design may require a new balance to work properly at high frequencies.
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Originally posted by Toros View PostIn English language here - http://www.geotech1.com/cgi-bin/page...gnum/index.dat
It is there for years, Carl provided it long time ago.
Original Flind's Magnum is working on 15kHz.
Andy Flind explained coil balancing and also provided simple circuitry which helps a lot for that task.
I simply followed his article and everything came on the place easily.
But than again; i mentioned this in my first posts here. No need to repeat.
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