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hello,q1 is bc 557,q 11 is bc 517,datasheet says the pins are rotated.
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c60 smd has only 20 volts instead of 25.Comment
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are there at board +8V in Test Point '+8V' and -7,...V in Test Point '=8V'?Comment
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hello,8 volt + is okay,but =8 volt test point is only- 5 volt.!Comment
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coil test,
5v 20 usComment
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what to do now I do not know... at first you should solder only 7808, 7660 and TX neighbour. then to look the pic on o-scope. desolder transistors in TX generator, turn off a coil, measure -8V again.Comment
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I wobbled a little after I had the 7660 now works the All Metal mode, the disc mode unfortunately many faults,
I suppose this is due to the unfavorable tx amlitude because I still have to look if I hold the switch in the momentary position of a faint hum listen, is this normal?Comment
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can you give marking on your D1 Zener diode?Comment
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hello,the diode call bzx 55c, the titles of the dealer was Zener-Diode 500 mW Diotec ZPD4,3V Gehäuseart DO-35 P(tot) 500 mW Zenerspannung 4.3 VComment
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good. the frequency is 14kHz I see on your o-scope pic, but why TX signal form is so unclear? something wrong in the generator.Comment
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I finished found coil and o-scoped everything looked right only things are that alu piece in the back of board how tall and wide is it also what size are the screw holes for mountingComment
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sizes of the piece for this oldie connector used in GMT drawn on a pic. for new microphone type one I used of I took alu with more height.
regardsComment
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a signal on TX winding directly o-scoped. 20 usec/div and 2 V/div scale.
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Hi, just back from vacation, I just took my board in hand and just see c 1 has only 40 pf, correct time tomorrow, maybe this is the error.Comment
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the capacitor is not the problem, but a bridge removed, the smaller of amplitude is normal now,
there have now intervals, in the All Metal mode, it almost sounds like my barracuda pi in disc mode much noise stops when the metal comes in range, then it works normal.Comment
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