Quote:
Originally Posted by Esteban
Before emit the BFO an only hertz, the amplification enlarge this "soft breeze". With this type of detector (I had one of 80's generation) I found a copper plate 120 X 60 cm (very big) at 50 meter distance and 1.5 meter depth with a coil of 11-12 cm diameter.
The old coil I saw was turn by turn, but other models has classic winding. The BFO is a transmitter since is an oscillator and at the same time is a receiver, so attention with the "obsolete". 
Here exactly the middle and the end of 80's pistol I had: |
Hi Esteban.
Perhaps if it published the schematic of this 80's detector in forum it was found guys that would make good and intelligent modifications so that it becomes enough better
. You do not know some time what becomes
Regards