The correct coil for silverdog surf pi 1.2

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Hello everyone, I am building the silverdog surf pi 1.2 , I would like to build 2 coils, one 10 "and one 8", I have 0.51 mm enamelled copper wire available. around I read that a correct coil should be between 350-400 uh (confirmed?) and in the instructions I found they recommend about 20 turns of wire for a dimeter of about 23 cm. Do any of you know the original white's plate what inductance does it have? Sorry for my don't perfect english ......

Best regards from Sicily

[WM6]

You are on the right way.

I managed inductance of about 330uH for Surf-PI and for some other PI projects too.

Wish you all success.

[kt315]

in real life we do 'BASKET' or 'FAST' or 'FASTEST' coil. this forum has good advanced SEARCH engine. use it.

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my idea was to 3D print a round support where to test various windings ..... as soon as I find what satisfies me, I create the mold of the plate with the 3d printer, I put it inside the support and the waterproof cable gland and close everything with thermal shock resistant nautical resin

[silverdog]

Hello everyone, I am building the silverdog surf pi 1.2 , I would like to build 2 coils, one 10 "and one 8", I have 0.51 mm enamelled copper wire available. around I read that a correct coil should be between 350-400 uh (confirmed?) and in the instructions I found they recommend about 20 turns of wire for a dimeter of about 23 cm. Do any of you know the original white's plate what inductance does it have? Sorry for my don't perfect english ......

Best regards from Sicily

I have an original Surfmaster coil - it measured 254uH on my meter

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hello silverdog, this component list its correct?
ID Name Designator Footprint Quantity
43 220k R17 AXIAL-0.1 1
30 47k R22 AXIAL-0.3 1
31 100k R35 AXIAL-0.3 1
32 33 R34 AXIAL-0.3 1
33 100k R1,R18,R23 AXIAL-0.1 3
34 3.3k R2 AXIAL-0.1 1
35 100 R4,R5 AXIAL-0.1 2
36 15k R25 AXIAL-0.1 1
37 10k R12 AXIAL-0.1 1
38 1k R14,R13,R21 AXIAL-0.1 3
28 220k R15,R16 AXIAL-0.3 2
24 51k R26,R29 AXIAL-0.3 2
25 240k R28 AXIAL-0.3 1
16 1M R9 AXIAL-0.3 1
17 22k R11,R20 AXIAL-0.3 2
13 390 1/2w R6 AXIAL-0.3 1
7 1k R3,R7,R8 AXIAL-0.3 3
39 100K Delay P3 potenziometro 1
40 100K Offset P1 TRIMMER_VISHAY_64W 1
41 10K Tuning P2 potenziometro 1
42 1K Volume P4 potenziometro+switch 1
3 1N4001 D6 DO-41 1
14 1N4148 D1,D2,D3 DO-35 3
11 1000uF 25v C2 CAP-D10.0XF5.0 1
5 220uF 25v C13,C14,C15 CAP-D5.0XF2.0 3
19 1nF C9,C17,C10,C11,C12 0.01uF, 63V Capacitor copy 5
29 470nF C5,C6,C7 0.01uF, 63V Capacitor copy 3
22 100nF C16 0.01uF, 63V Capacitor copy 1
18 100nF C3,C4,C18,C8 0.01uF, 63V Capacitor copy 4
9 22nF C1 0.01uF, 63V Capacitor copy 1
26 LM358N U3 DIP8 1
21 MC14093B U4 DIP14 1
20 CD4066 U7 DIP14 1
15 NE5534 U2 DIP-8 1
8 TLC555 U1 DIP-8 1
6 ICL7660 U6 DIP-8 1
4 78L05 U5 TO-92(TO-92-3) 1
27 MPSA13 Q6 TO-92(TO-92-3) 1
23 IRF9640 Q2 TO-220(TO-220-3) 1
10 2N3906 Q1 TO-92(TO-92-3) 1
1 BAT BATTERY HDR-1X2/2.54 1
2 SW1 SWITCH HDR-1X2/2.54 1
12 Coil L1 HDR-1X2/2.54 1

and i have pcb marked surf pi 1.2 and not surf pi 1.2 apb, there are differents?

thank you

regards

[silverdog]

No difference between 12. APB and 1.2

Partslist attachedsurfpiparts.txt

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Hello silverdog, in the pcb there are 2 point signed TP1 and TP2 (near delay trimmer) what function do they have? another question, IS possible add a button for no motion mode/pinpoint in this circuit? i have just build a prototipe coil, 10" monoloop 260uH and 1,5 ohm without cable coil.......