| IC1 | 8748, 8748-8, 8749 or 8741, microcontroller, Intel or NEC |
| IC2 - IC7 | LED, common cathode, or 8 digit module from pocket calculator |
| IC8 | 14511 or 4511, BCD to 7-segment decoder/driver |
| IC9 | 7406 or 7416, hex inverter with open collector |
| C1, C2 | 22 pf ceramic |
| C3 | 1 microfarad, tantal capacitor |
| C4 | 100 nF ceramic or polyester |
| T1, T2 | 2N2222 or equialent |
| Y1 | 2 MHz crystal |
| S1, S3, S4 | 1 pole push button |
| S2, S6 | 1 pole , 2 position switch or fix jumpers |
| S5 | 2 pole, 5 position rotary switch or fix jumpers |
| R1-R4 | 10 kohm 1/4 watts |
| R5 - R12 | 180 ohm 1/4 watts, adjust for LED intensity |
| R13, R14 | 1 kohm 1/4 Watts |
| R15 - R18 | 10 kohm 1/4 watts |