design I schematic

[alnamr]

hi to all
This sketch plan from me,Is it possible will succeed in the detection of metal

[maikl]

Hi alnamr. At what distance in the air detected by 25mm coin? Image resolution is weak, I can not see the elements.

[alnamr]

hi maikl

how are u see list
u1 7910
u2 lm386
u3andu4 ua741 ampl
c1 47n
c2 250u\10v
c3 1n
c4 740u\25v
c5 10u\10v
c6 10n
c7 100n
c8 470n
c9 1u
c10 1000u\10v
r1 10k
r2 1\2k
r3 10k
vr1 10k
d1 zener 10v
d2and3 1n4148
q1 bc214L AMPLIFIER TRANSISTOR

LS 1 8 OHM SPEKER AND SOUND METER 12V 16 OHM

l1 3\5 swg 200 torn 12\5cm
l2 3\5 swg 80 torn 25 cm

Wish I would have discovered how much Hz will produce thes board

[alnamr]

se thes file

isis7 profsional