King Cobra PCB

[kt315]

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.

regards

[calebsone]

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 mounting

[kt315]

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.

[herpes]

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 V

[kt315]

can you give marking on your D1 Zener diode?

[herpes]

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?

[kt315]

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.

[herpes]

coil test,
5v 20 us

[herpes]

hello,8 volt + is okay,but =8 volt test point is only- 5 volt.!

[kt315]

are there at board +8V in Test Point '+8V' and -7,...V in Test Point '=8V'?

[herpes]

c60 smd has only 20 volts instead of 25.

[herpes]

hello,q1 is bc 557,q 11 is bc 517,datasheet says the pins are rotated.

[kt315]

what type you use Q1 and Q11 transistors? I see they are soldered inverted. main rule is all resistors have to be measured before to be soldered, even you are confident in its colour code.

[herpes]

how could it be otherwise, no problems, the disc position metal detected, but only to a maximum of 5 cm (two ton),all metall position no metal perception, have the switch cable checked, all in order, would be a wonderful if times times what works directly

[kt315]

What is the maximum depth at which a metal will find

http://www.losttreasure.com/content/archives/gold-mountain-gmt-1650

http://www.losttreasure.com/content/archives/gold-mountain-king-cobra