Quote:
Originally Posted by GOLDEN LILLY
Hello morgan, just to ask you few questions on the pdk i built following you coil information, that is 40 turns, .30mm wire and 6 cm diameter. I tried 2.2n to 12n capacitors but it is less sensitive. I am referring to my crt tv as initial test since my buried target is still one month old.
I experimented several capacitors and found out that lower capacitor value just like 500 picofarad or lower, the pdk create a strong capacitance that touching the potentiometers, that is, the gain and sensitivity it will beep. The same is true also when my hand is near to the coil, it will beep. Also, a quarts watch at 5cm can also be detected. Those findings did not happen to the capacitors 2.2 to 12n. I also found out that placing the sensitivity knob to its proper place is very important.
According the instruction on your pdk, the point of sensitivity is reached when a beep is heard by touching the knob and turning the sensitivity to its triangle mark. So i think that capacitance plays a role of the phenomenon detection. Please comment...
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Hello GOLDEN LILLY
Would you like to tell me the inductance of your coil, i want to calculate frequency range for Morgan pdk.
your crt tv is irrelevant for testing any lrl. Also battery spark is irrelevant, mobile phone also, any kind of remote transmitters also.
make silver loop target, with 1-2kg salt, and wait a month, if a weather is hot, you will have where to test your pdk.
Esteban cabrera grinok advice is to use big copper plate /as bigger/ you could find, expose it to hot sunlight several hours, and make short therm test but not from long distance. Maybe help....
For temperature stability use only silver-mica high quality capacitors, especially those playing role as resonant capacitors, also use them as decoupling capacitors. instead electrolytic capacitors use tantalum with very small leakage curents, and working voltage 4x bigger than working pdk voltgage. best stability you will get if you connect transistors thermally with each other.
Best regards
dragan