Russian metal detector 'pirate' noise (solved)

preview_player
Показать описание
(SOLVED) I've built the pirate-the well known in Russia metal detector. There is something wrong with it and I can't figure out what.At first I had no sound at all.I turned it off left it for a while and when I turned it back on again I got this continuous sound -beginning of the video-for a while.When I turned the white pot (22k) the volume of the sound dropped and couldnt get it back to the previous volume.Overall it doesn't seem to work-It doesnt react to metals.Any ideas?

This problem is solved.Here is the complete metal detector.

metal detector for beginners/kids,etc
Рекомендации по теме
Комментарии
Автор

ive just build this detector just 3 days ago and its good i use 0.25mm magnet wire on 15cm diameter 32 turns and instead of using 22k i use 100k and 50k potensiometer in series i also encountered your problem i figured out that the irf740 is heating up i use a heatsink on it and i figured out that the coil should have a strong connection at the positive rail and at the drain pin of irf740 or even try to reverse the conection of the coil that should solve your problem 
-just as me i can help you
-BEST REGARDS

jaimelomayno
Автор

у тебя динамик металлическии прям в центре катушки лежит поэтому и шум постоянный

ПриборныйпоискстаринывКазахста
Автор

динамик с катушки убери и все близ лежащее металическое =D

ДмитрийПроворов-эш
Автор

hola que tamaño en vatios son las resistencias

wllidjs
Автор

У МЕНЯ ТОЖЕ ТАКАЯ ПРОБЛЕМА ВОЗНИКЛА ПОДЕЛИСЬ В ЧЕМ ПРОБЛЕМА

НиколайШМАГЛИЕНКО
welcome to shbcf.ru