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| Part |
 Value |
Farnell code |
| R1, R2 |
22R |
934-2869 |
| R3, R5, R7 - R9 |
470R |
934-3245 |
| R4, R6, R10 - R12 |
10K |
934-2419 |
| R13 |
10K SIL 8 |
935-6371 |
| R14 |
10K SIL 6 |
935-6142 |
| C1 - C3 |
100nF |
750-992 |
| C4, C5 |
22pF |
746-990 |
| D1 - D3 |
1N4004 |
956-5027 |
| D4, D5 |
BZX85-C5V6 |
984-4252 |
| D6 - D9 |
5mm LED |
100-3213 |
| XTL1 |
20Mhz HC49/4H |
971-2879 |
| TR1 - TR3 |
BC337-40 |
955-8675 |
| IC1 |
PIC16F873A |
976-1098 |
| IC2 |
6N137 |
999-4866 |
| IC3 |
MAX488 |
972-5598 |
| IC4 |
NKE0505S |
435-3195 |
| RL1 - RL3 |
MR82-5USR |
109-4027 |
| CN1 - CN6 |
IMO 20.501M/3 |
963-2980 |
| CN7 |
Molex KK 22-27-2061 |
973-1172 |
| CN8 |
Molex KK 22-27-2031 |
973-1156 |
| SW1 |
MCDA08 |
947-1561 |
| SW2 |
MCDA04 |
947-1545 |
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The colour of the LED is not important and so the Farnell part number supplied is that of a cheap Yellow LED, feel free to substitue this with any colour of your choice.
In addition you will also need the mateing plugs for CN7 & CN8. These are made from crimp housings 22-01-2065 (143-129) and 22-01-2035 (143-127) along with crimp connectors 08-50-0106 (101-2163).
If you only wish to use 1 relay then you will not need parts R8, R9, R11, R12, D2, D3, D7, D8, TR2, TR3, RL2, RL3 & CN3 - 6. In addition if you only need one set of relay terminals you can also dispense with CN1.
The DIP switches I picked have pin spacing the same as standard jumpers (511-833 & 972-8970), so if you want to save on the build cost then you can use jumpers instead.
You will also need a 5v supply and some suitable XLR connectors to complete the project.
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