| Item | Reference | Part | Value | Digi-Key Part # | Possible Substitute | 1 Board |
| ______________________________________________ | ||||||
| 1 | C11,C5 | Ceramic Capacitor | 100 pf 50V disc Y5P | 495-1025-1-ND | 2 | |
| 2 | C13 | Ceramic Capacitor | 0.0022 �f 100 V X7R axial leads | 1119PHCT-ND | 1 | |
| 3 | C3,C6,C7,C8,C9,C10,C12,C14, C15,C17,C18,C19,C20,C21 | Ceramic Capacitor | 0.1 �f 25 V Z4V radial leads | 399-2155 | 14 | |
| 4 | C4 | Tantalum Capacitor | 1 �f 20 VDC radial leads | 478-1833-ND | 1 | |
| 5 | C2 | Tantalum Capacitor | 6.8 �f 16 VDC radial leads | P2037-ND | 478-1919-ND | 1 |
| 6 | C1 | Tantalum Capacitor | 33 �f 25 VDC radial leads | P2052-ND | 478-1897-ND | 1 |
| 7 | C16 | Electrolytic Capacitor | 330 �f 25 V elect axial | 4036PHCT | 1 | |
| 8 | D1,D4 | DIODE 1N4148 | 1N4148-TPMSCT-ND | 2 | ||
| 9 | D2 | BUZZER | 102-1116**** | 1 | ||
| 10 | D3 | LED | LED T-1 Dbl Green Diff Flange | 160-1142-ND | 1 | |
| 11 | JP1,JP2,JP3,JP4,JP5,JP6 | 2 Pin Header | SIP Header 2 Pos straight | A23897-ND | A30770-ND | 6 |
| 12 | RN1,RN2,RN3 | Resistor Array | 1.2k array | 1.2KEBK-ND ** | 21 | |
| 13 | R1, R7, R19 | Resistor | 51 ohm 1/4w 5% carbon film | 51QBK-ND | 3 | |
| 14 | R12 | Resistor | 470 ohm 1/4w 5% carbon film | 470QBK-ND | 1 | |
| 15 | R8,R20 | Resistor | 1.1k ohm 1/4w 5% carbon film | 1.1KQBK-ND | 2 | |
| 16 | R10,R11,R14 | Resistor | 4.7k ohm 1/4w 5% carbon film | 4.7KQBK-ND | 3 | |
| 17 | R2,R16,R22,R23 | Resistor | 10k ohm 1/4w 5% carbon film | 10KQBK-ND | 4 | |
| 18 | R3,R6,R15,R18 | Resistor | 11k ohm 1/4w 5% carbon film | 11KQBK-ND | 4 | |
| 19 | R4,R9,R17,R21 | Resistor | 12k ohm 1/4w 5% carbon film | 12KQBK-ND | 4 | |
| 20 | R25 | Resistor | 47k ohm 1/4w 5% carbon film | 47KQBK-ND | 1 | |
| 21 | R5 | Resistor | 100k ohm 1/4w 5% carbon film | 100KQBK-ND | 1 | |
| 22 | R13 | Resistor | 120k ohm 1/4w 5% carbon film | 120KQBK-ND | 1 | |
| 23 | R24 | Resistor, variable | 100k pot 3/8" SQ Cerm side adj | 3296X-104-ND | 3296X-104LF-ND | 1 |
| 24 | S1, S3 | Switch | Toggle SPDT ON-ON | CKN1021-ND | 2 | |
| 25 | S2,S4 | Switch | Toggle SPDT ON-OFF-ON | CKN1025-ND | 2 | |
| 26 | U1 | 5V 1.0 AMP V Reg TO-220 | LM7805CT | LM7805CT-ND | 1 | |
| 27 | U2,U16 | IC Precision Timer 8-dip | NE555 | 296-1411-5-ND | 2 | |
| 28 | U3,U12 | 7ns Comparator | AD8561AN | AD8561AN-ND | AD8561ANZ-ND | 2 |
| 29 | U4 | IC 2-IN AND Gate | 74LS08 | 296-1633-5-ND | 1 | |
| 30 | U5 | QUAD 2-IN Nand Gate | 74LS00 | 296-1626-5-ND | 1 | |
| 31 | U6,U9,U13 | LED 7-SEG 1.0SNGL Red | 7seg | 67-1485-ND | 3 | |
| 32 | U7,U10,U14 | (N) Decade Counter | 74LS90 | 526-NTE74LS90 *** | 3 | |
| 33 | U8,U11,U15 | BCD-TO-7SEG decoder/dr | 74LS47 | 296-3712-5-ND | 3 | |
| 34 | Power Supply | 12 VDC - 0.8A | 412-112103 ($8.69)*** | 1 | ||
| 35 | 2 Pin Housing | polarized | A19490-ND | 6 | ||
| 36 | Crimp | (okay to crimp with pliers) | A23962-ND | 12 | ||
| 37 | Heat Sink | for voltage regulator | 294-1114-ND | 1 | ||
| 38 | D5 | Diode | For 2006 Circuit Board only | MBR340IR | 1 | |
| created 10/9/01 | ||||||
| modified 6/3/02 – Corrected Part Number for Item 3 | ||||||
| modified 11/4/04 – Updated Parts Numbers | http://www.digikey.com | Digi-Key | ||||
| modified 11/5/04 – Typo and added Moser Part Number | http://www.mouser.com/ | ***Mouser Electronics | ||||
| modified 3/29/06 – Replaced obsolete parts | ||||||
| modified 4/17/06 – Corrected item number for 13 and part number for 35 and added 36 and 37 | ||||||
| modified 6/27/06 – Added diode for version 2006 circuit board | ||||||
| modified 1/16/08 – New suggested parts are listed as a possible substitute - suggested by Abaz Kryemadhi | ||||||
| ** replace each resistor array with 7 discrete resistors (1.2K 1/8 watt) placed across each location (e.g. from pin 1 to pin 14, 2 to 13 etc.) | ||||||
| so you will need 21 resistors to replace the 3 arrays. | ||||||
| ****you will have to bend the leads slightly to fit into the holes for pre 2006 circuit boards | ||||||