The schematic above is marked as revisino 1.2, but it is identical to the 1.3 revision with 1 excpetion. The is a 100R resistor on the RD & WR lines between IC2 & IC1. I will update the schematic as soon as I get a chance to reflect this.
The following table lists all the parts you need to make up a PCB without a case. I have also provided a potential supplier for each of the items, although in many cases there are many different suppliers who will be able to provide the same or compatble parts.
You can also order the PCB and programemd PIC, or a full kit of all the parts from the Ordering section.
| Part |
 Value |
Supplier |
Code |
| IC1 |
PIC16F874A-I/L |
Farnell |
976-1195 |
|
Socket |
Farnell |
1101356 |
| IC2 |
DLP-USB245M |
FTDI |
DLP-USB245M-G |
|
Socket |
Farnell |
110-3851 |
| IC3 |
DS2016 |
Farnell |
795-914 |
|
Socket |
Farnell |
428-5645 |
| IC4 |
NDP6020P |
Farnell |
101-7724 |
| IC5 |
NKE0505SC |
Farnell |
115-8357 |
| IC6, IC7 |
6N137 |
Farnell |
999-4866 |
|
Socket |
Farnell |
428-5566 |
| IC8 |
MAX488CPA |
Farnell |
972-5598 |
|
Socket |
Farnell |
428-5566 |
| R1, R2, R5 |
10K |
Farnell |
934-2419 |
| R3, R4 |
470R |
Farnell |
934-3245 |
| R6 - R9 |
22R |
Farnell |
477-680 |
| R10, R11 |
120R |
Farnell |
770-024 |
| R12, R13 |
100R |
Farnell |
934-2397 |
| R14 * |
1K |
Farnell |
934-2400 |
| C1, C2 |
22pF |
Farnell |
746-990 |
| C3 - C7 |
100nF |
Farnell |
121-6444 |
| C8 - C9 * |
100nF |
Farnell |
121-6444 |
| XTL1 |
HC49/4H 20Mhz |
Farnell |
971-2879 |
| D1 - D4 |
BZX85-C5V6 |
Farnell |
984-4252 |
| CON2 |
KK 22-27-2051 |
Farnell |
973-1679 |
| (Socket) |
KK 22-01-2055 |
Farnell |
973-1679 |
| (Crimp Terminals) |
KK 08-50-0106 |
Farnell |
101-3097 |
* Required when using the UM245R conversion module
If you are going to use the suggested case, you must not put IC3 in a socket, and you will not need CON2. You can also use the cheaper socket type from IC3 on IC2 as there is no pressure from inserting the USB leads. The following table lists the additional parts that you will require.
| Part |
Value |
Supplier |
Code |
| XLR Socket |
NC5FDM3H |
Canford |
40-583 |
| USB Socket |
NAUSB |
CPC |
CN09520 |
| Endplate x 2 |
50220-20 |
CPC |
EN55922 |
| Extrusion x 2 |
10201-20 |
CPC |
EN55949 |
| 2U Plain moudle |
20201-20 |
CPC |
EN55876 |
| 2U XLR module |
20511-20 |
CPC |
EN55880 |
| B6x6 Screw x 4 |
95606 |
CPC |
EN55983 |
| B8x13 Screw x 8 |
95813 |
CPC |
EN55985 |
| USB connector |
Open lead |
CPC |
CS03078 |
schematic_1_2.pdf (28KB)
