dricot
Newbie level 3
EMF detector
Can any one help me with a EMF detector as I build one on Bread Board using two BC 3904 to make a Darlington pair and a BC 3906 with the base of the 3906 connected to the collector of the Darlington pair 3v on the emitter of the BC 3906 the positive side of a buzzer and led connected in series on the collector with the neg to the emitter of the Darlington pair and a coil comprising of ten turn of enameled copper wire as a pick up coil to the base of my Darlington pair and it did all that I want it to do buzz if there is currant in the out let but now that I have soldered it all on Vero board it will not stop to buzz WHY as I have tried all that I can think of and I cant get it to work no more .
Can any one help me with a EMF detector as I build one on Bread Board using two BC 3904 to make a Darlington pair and a BC 3906 with the base of the 3906 connected to the collector of the Darlington pair 3v on the emitter of the BC 3906 the positive side of a buzzer and led connected in series on the collector with the neg to the emitter of the Darlington pair and a coil comprising of ten turn of enameled copper wire as a pick up coil to the base of my Darlington pair and it did all that I want it to do buzz if there is currant in the out let but now that I have soldered it all on Vero board it will not stop to buzz WHY as I have tried all that I can think of and I cant get it to work no more .