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Capacitors

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C1……………………….  10uF-16v electrolytic
C2,  C3 ……………………….18pF ceramic
C4, C5, C7, C8, C9, C14 ……………………..….100nF (or Code 104) ceramic
C18,  C20,  C21,  C23,  C26 ……………………….100nF (or Code 104) ceramic
C6,  C12 ……………………….100uF-16v (or Code 107) Tantalum
C10 ……………………….5pF (or 4.7 pF) ceramic-high quality
C11……………………….  2.2uF-16v (or Code 225) Tantalum   
C13,  C17,  C25 ……………………….470uF-16v electrolytic
C15,  C16 ……………………….4700uF-16v electrolytic
C19,  C22 ……………………….1000uF-16v electrolytic
C24 ……………………….2200uF-25v electrolytic
* Ceramic capacitors voltage isn’t important.  
*you can Use a capacitor with higher voltage but don’t use capacitors with lower
voltage at all.  

Resistors

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R1,  R17,  R21 ……………………….1K
R2,  R16 ……………………….47 ohm
R3 ……………………….10K
R4,  R14,  R20 ……………………….4.7K
R5,  R18……………………….  2.2K
R6,  R15……………………….  10 ohm
R7 ……………………….1.5K
R8 ……………………….1.8K
R9 ……………………….1M (one mega-ohms)
R10……………………….  100 ohm
R11,  R12 ……………………….390 ohm  – 2W   
R13……………………….  18K
R19……………………….  22K
* All 0.25w1% carbon film except R11 and R12 (these are 2w and 1% metal film
or better)

Transistors

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T1…………………… BS170 original  
T2 ……. .…………….IRF840 or STW11NK100Z (MOSFET)  
T3 ……………………BC337

Iintegrated Circuits

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U1…………….  ATmega328P-PU (microcontroller) Type 28 pin
U2……………. .  LF357N,  not fake (LF357H metal,  LF157,  LF257)  
U3……………. .  L7805CV,  high quality of 5V regulator  
U4……………. .  L7812CV12 volts 1.5 A, high-quality regulator + small and strong

Other parts

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X………… 20MHz crystal 20 MHz (20.000 or 20.0000 or 20.000000)  
D1,  D2 ……………………………….1N4148 diode
D3 ……………………………………1N5819 diode
LCD……………………………… 16*2 character LCD with backlit   
SP……………………………… small 8 ohm speaker,  0.2 W or more piezoelectric speaker
or headphones.  
BAT……………………………………. . Battery 18 to 24 V, 2-4 amps
LOOP…………………………………. .  350uH  – 1 ohm – Spider-loop search (proposed)
S ………………………………. .5   high quality push button mounted box (normal cut and pressed mode Contact)
PCB……………………………… 7.3 x 7.9 cm fiber  – rather than fiberglass