What is this Schematic?

[catalin2626]

[bernte_one]

please give us more info
do you have partlist?

where do you get this scheme?

i can remind that i have seen similar device last two weeks while looking for now Projects
was also with optocoupler

U1 is pic Controller right?

if you Need help you should Play with open Cards, ok?

[catalin2626]

Comp
R2, R3, R4, R8, R10, R15, R19, R23 = rezistor 1 K
R5, R12, R14, R7 = rezistor 10 K
R18, R21, R22 = rezistor 22 K
R9 = rezistor 3,3 K
R11 = rezistor 330 K
R13 = rezistor 1 M
R16 = rezistor 30 K
R17 = rezistor 220 ohmi
R20 = rezistor 1,5 K
R24 = rezistor 33 ohmi
RS1, RS2, RS3, RS4 = 0 ohmi
R1 = semi 100 K
R6 = pot 10 K
C2, C3, C4, C5 = cond 100 nF
C6 = cond 1000 uF
C7, C8 = cond 100 uF
C9 = condr 10 uF
C1 = condensator 10 nF
D1, D2 = dioda 1N4148
OK1 = optocuplor 817
Q2 = tranzistor IRF 9540
Q1 = tranzistor BD 139
Q3 = tranzistor 2N3906
IC2 = NE 5534AP
IC1 = CD 4053BE
IC3 = LM 358P
IC4 = BE 555
IC5 = 7805
IC6 = ICL 7660
U1 = PIC 10F202
DIF-1, DIF-2 = dif 8-32 ohmi
PCB: 7,7 x 10 cm

[catalin2626]

I would like to know if it is worth doing

[catalin2626]

what changes can be made

[bernte_one]

seems that is has two stage Receiver amp - thats ok

if coil damping resistor is r2 it could be i Little bit to high better to search best value by measuring the damping curve
and i should have more watts then the other 1k resistors maybe 2w at least

do you have layout for pcb, hexcode and source?
source would be nice so we can watch Timing of the delay, and pulse freq. and width

you Need at least a working hex

[bernte_one]

it is this right?

http://www.constructii-electronice.r...tector_pi.html

i think you have to buy the hex code

i hate don´t like People which Claim diy Project and sell pre-programmed µControllers
pcb Looks good and kit seems ok
but how much should you spent (how many €)?

[catalin2626]

yes it is, do not have hex file, parts would reach 30 euros

[bernte_one]

do you have contact to seller, or are you the seller?

is the Price including the pre-programed µController, and how much is shipping Romania to Germany for example?
PayPal possible?

if the Price is for
-pcb,
-all onboard parts,
-pre-programmed Controller
and maybe the two pin aviation conector plug

the price is ok

the coil and Connection cable is not needed, because most poeple here do the own coils which fits best to their coil Shells
for myself i prefer 27cm or 32 cm for those kind of pulse detectors

[catalin2626]

sells ready assembled complete with coil He says that detects a gold ring from 20 cm with coil 22 cmI'm not the seller, I want to buy it,how do I make more sensitive I do not know how cost from romania to Germany should contact seller

[catalin2626]

I'll order one and I will try with another coil maybe 27cm or 32 cm

[Davor]

Don't bother, it even has no EF sample. Build a Surf or Baracuda instead.

[catalin2626]

I already ordered I will try and tell you how it works

[bernte_one]

i got no reply from seller

after wathing this Project it seem easier to build pickini pi v3 from Bernard
Complete Project ist free and Performance seems equal or better

[catalin2626]

with 38cm coil detects a euro coin from 10 cm and a piece of galvanized sheet 10/10 cm to 60 cm in air The maximum for a large piece of metal is 1.2 m I think it's ok