Surf PI Pro

[diplodus]

hi,
this is my first post in this great forum, and after reading a lot about different metal detectors here, i decided to start building Surf pi metal detector and precisely the surf XX posted by ApBerg AND made by Paku, who provided a very good image of his board.
Now i am waiting for my components to arrive so i can start etching my PCB and solder components, meanwhile i want to share with you my component list based on the board provided by Paku (i added values of each component on the board).
i hope this is going to work so everyone could make his own MD :



*********************CAPACITORS******************* *****************


C1 22nF 0.022uF 100V 5% Mylar Film Capacitors


C2 2200uF 50V 105C Radial Electrolytic Capacitor 16x32mm
OR 1000uF 50V 105C Radial Electrolytic Capacitor 13x26mm


C3 100nF 0.1uF 100V 5% Mylar Film Capacitors
C4 100nF 0.1uF 100V 5% Mylar Film Capacitors
C5 220nF 0.22uF 100V 5% Mylar Film Capacitors
C6 220nF 0.22uF 100V 5% Mylar Film Capacitors
C7 1uF 100V 5% Polyester Film Box Type Capacitor
C8 47nF 0.047uF 100V 5% Mylar Film Capacitors
C9 1nF 0.001uF 100V 5% Mylar Film Capacitors
C10 1nF 0.001uF 100V 5% Mylar Film Capacitors
C11 1nF 0.001uF 100V 5% Mylar Film Capacitors
C12 1nF 0.001uF 100V 5% Mylar Film Capacitors
C13 220uF 50V 105C Radial Electrolytic Capacitor 10x13mm
C14 220uF 50V 105C Radial Electrolytic Capacitor 10x13mm
C15 220uF 50V 105C Radial Electrolytic Capacitor 10x13mm
C? 220uF 50V 105C Radial Electrolytic Capacitor 10x13mm
C16 100nF 0.1uF 100V 5% Mylar Film Capacitors
C17 220pF 50V Ceramic Disc Capacitor
C19 100pF 50V Ceramic Disc Capacitor
C20? 100nF 0.1uF 100V 5% Mylar Film Capacitors
C? 100nF 0.1uF 100V 5% Mylar Film Capacitors






*********************IC's************************* *******************




IC1 TLC555
IC2 NE5534 IC 5534 Low-Noise Operational Amplifier IC
IC3 LM358N LM358 358 Low Power Dual Op-Amp IC
IC4 CD4093 4093 IC CMOS NAND SCHMITT TRIGGER
IC5 L78L05ACZ L78L05 78L05 +5 VOLTS 100mA Voltage Regulator IC
IC6 ICL7660CPAZ ICL7660 CMOS Voltage Converter IC
IC7 CD4066 4066 IC CMOS QUAD BILATERAL SWITCH




*********************DIODS************************ ******************




D1 1N4148 Switching Signal Diode
D1 1N4148 Switching Signal Diode
D1 1N4148 Switching Signal Diode
D6 1N4001 Diode 1A 50V




*********************TRANSISTORS****************** *****************




T1 2N3906 PNP General Purpose Transistor
T2 IRF9640 Power MOSFET P-Channel 11A 200V
T6 BC517 Transistor NPN 30V 0.5A TO-92 BC517-AT/P




*********************POTS & TRIMPOTS********************************




DELAY 10K OHM Linear Taper Potentiometer
TRESH 10K OHM Linear Taper Potentiometer
VOLUME R33 1K OHM Linear Taper Potentiometer
SENS 100K OHM Linear Taper Potentiometer
20K OHM OHM Trimpot Variable Resistor 6mm
100K OHM TRIMMER POTENTIOMETER CERMET 25 TURNS 3296W
5K OHM TRIMMER POTENTIOMETER CERMET 25 TURNS 3296W




*********************RESISTORS******************** ******************



R1 100K OHM 1/4W 5% Carbon Film Resistor
R2 3.9K OHM 1/4W 5% Carbon Film Resistor
R3 1K OHM 1/4W 5% Carbon Film Resistor
R4 100 OHM 1/4W 5% Carbon Film Resistor


R4bis 2.2K OHM 1/4W 5% Carbon Film Resistor


R5 100 OHM 1/4W 5% Carbon Film Resistor


R6 i couldnt find 360 OHM 2W SO I WILL USE 1K OHM TRIMMER POTENTIOMETER temporarily OR


750 & 680 OHM 1W 5% Carbon Film Resistor in parallel to get 356 OHM 2W ( almost 360 OHM)



R7 1K OHM 1/4W 5% Carbon Film Resistor
R8 1K OHM 1/4W 5% Carbon Film Resistor
R9 1.2M OHM 1/4W 5% Carbon Film Resistor
R11 22K OHM 1/4W 5% Carbon Film Resistor
R12 10K OHM 1/4W 5% Carbon Film Resistor


R? 12 OHM 1W 5% Carbon Film Resistor ( i only have a 1/4 W and i don't know if its going to work)


R13 1K OHM 1/4W 5% Carbon Film Resistor
R14 1K OHM 1/4W 5% Carbon Film Resistor
R15 330K OHM 1/4W 5% Carbon Film Resistor
R16 330K OHM 1/4W 5% Carbon Film Resistor
R18 47K OHM 1/4W 5% Carbon Film Resistor
R20 22K OHM 1/4W 5% Carbon Film Resistor
R21 1K OHM 1/4W 5% Carbon Film Resistor
R22 220K OHM 1/4W 5% Carbon Film Resistor
R23 22K OHM 1/4W 5% Carbon Film Resistor
R26 51K OHM 1/4W 5% Carbon Film Resistor
R28 240K OHM 1/4W 5% Carbon Film Resistor
R29 51K OHM 1/4W 5% Carbon Film Resistor
R34 22 OHM 1/4W 5% Carbon Film Resistor
R35 100K OHM 1/4W 5% Carbon Film Resistor






*********************IC Socket Adaptor********************************




4x8 pin DIP IC Socket Adaptor Solder Type
2x14 pin DIP IC Socket Adaptor Solder Type




PS: please correct me if i made any mistake.

[paku]

what i can say this detector is good for beach salt water

[diplodus]

update

i waited about a month to get the components i ordered from tayda (and i am not complaining since its very cheap and Thailand is VERY far from where i live ), but i am still waiting for TLC555 which i bought separately from ebay but didn't receive it, so i had to reorder from another seller and wait again. Meanwhile i made a BFO metal detector (http://www.easytreasure.co.uk/bfo.htm) and its working ! i can detect a coin from about 13 cm (about 5 inches) and a 20 cm (8 inches) metallic dish from 40 cm (16 inches).
i used toner transfer method and this is how my pcb looks:

after etching:

populated board:


for the surf xx, today i etched my pcb after some modifications made to the layout ( i made the lines thicker ) and i will start soldering tomorrow.
i used hydrochloric acid+hydrogen peroxide to etch the board, a very effective combination i used before to make CuCl2 (WARNING! the reaction can be very violent and heat emitting, the plastic container i used the first time i made CuCl2 melted just after adding copper to the mix, so be careful if you use it to etch your boards, always use non concentrated chemicals and add them in small amounts and always add acid to water not the opposite)
after etching:

cleaning:

result:


i will post a video of the BFO MD soon and hopefully surf xx too.


layout with thicker lines in pdf format if anyone wants it (its ready to print no re sizing needed 98.4 x 66.7 mm).
Surf XX-layout.pdf

[6666]

attachments now work

[diplodus]

now they are working

[gojo1]

hi all, I have just recently bought a smpro 3 and all-tho it went together nicely and did appear to be working, with diy coil. it does have an issue, the thing keeps beeping it is not a constant hum. I had set the pin 6 to 0v and played with the offset but for the life of me I can't stop it beeping.
If I adjust the delay knob to max I get no detection, min is only detection.
Threshold is nearly to max to stop most of the beeping.
gain was at full and did try different rate but to no real difference except for detection height.

Any help would be greatly appreciated.

[diplodus]

update

yesterday i soldered components on the board (except tlc555 and R6), but i noticed that the BC517 transistor must go the other way round to match the schematic so it would be great if anyone could confirm that because paku did the same error with his board, unless he used a different transistor with different pinout (MPSA13).
this is the board if anyone can help (please check also the IC's if they are correctly positioned ):





another thing, i used 4x12 ohm 1/4 W resistors to get 12 ohm 1 W, its a little bit ugly but i hope it will get the job done.
another question, can i use a phone battery charger with about 8 v in the output just to see if the board is working when finished? i used that for the BFO MD and it worked.
sorry for my English, i am not a native speaker

[6666]

Match the pins of the BC517
8v could be a bit low for testing, but try it.

[diplodus]

thank you 6666 for your replay
what about the 4x1/4 W resistors will that give 1W power rated resistor?
another thing when powering up the board, are there any precautions to take so nothing gets burnt? should i put the trimmers to the highest resistance or should i leave them at the middle?

[Thomas]

"4x1/4 W resistors will that give 1W power rated resistor" How?, That looks like trouble to me. 4x 12 R parallel = 3R. 4x 12 R in series = 48R@ .25W Not sure what the 12R@ 1W is for, could you post a pic of the SCH where it is located.

[6666]

thank you 6666 for your replay
what about the 4x1/4 W resistors will that give 1W power rated resistor?
another thing when powering up the board, are there any precautions to take so nothing gets burnt? should i put the trimmers to the highest resistance or should i leave them at the middle?

What schematic are you working from ?
Well 4x1/4 WATT in parallel = 1 watt
with powering up the board first time I would remove all chips, power up and take a few DC voltage readings, plug in 7660, measure the + and - 5 volts at each socket
if all ok and no smoke, replace the chips one by one, turning the power off each time of course., and power up
then adjust the dc off set on 5534 for 0.
rest of trimmers on maybe middle to start and work from there.

[diplodus]

i am working on this pcb provided by Apberg

its the resistor on top of NE5534 and C3 it does not say its 1W but in this board its 12 ohm 1W

i used [2 in series 12 ohm 1/4W] IN PARALLEL with [2 in series 12 ohm 1/4W], so i can get 12 ohm 1W resistor but if power rating adds only in parallel the result will be 12 ohm 1/2W.
thanks for the help 6666 and Thomas

[6666]

2 in series, paralleled with another 2 in series will also give 1 watt, the dissipated power adds up

[Thomas]

Ok, now I see

[gojo1]

helppp now I have 5v on pin 6. replaced and still the same.