Interface Construction
The design for this computer interface comes from Mironics (www.mironics.com)
The following parts are required. All resistors used should have a tolerance of 1% or better (ie use metal film resistors, not carbon film). In Australia, I recomment purchaisng components from Jaycar Electronics.
| Part | Quantity |
| 43 ohm Resistor | 1 |
| 56 ohm Resistor | 1 |
| 200 ohm Resistor | 1 |
| 270 ohm Resistor | 1 |
| 1k Resistor | 2 |
| 1.3k Resistor | 2 |
| 1.5k Resistor | 4 |
| 1.8k Resistor | 2 |
| 2.k Resistor | 1 |
| 2.7k Resistor | 1 |
| 5.6k Resistor | 1 |
| 10µF electrolytic capacitor | 1 |
| 0.01µF ceramic capacitor | 1 |
| 4051 (or CD4051) 8 way analogue multiplexer | 1 |
| 1N4148 signal didode | 4 |
| 16 pin IC socket (optional) | 1 |
| D25 male connector7 | 1 |
The circuit needs to be assembled according to the schematic diagram below. You can make your own pcb according to the design below, or use a prototyping board of some kind. The connector to the Minidisc unit can be obtained from an old Discman or MiniDIsc remote control, or made using a pcb or piece of veroboard. For more information, see the DIY section of the Mironics web site, or email me.
Note: The pin numbers on the MD unit 4-pin plug are "1" to "4" starting from left (near the stereo headset plug) to right.
PCB
Robert Horvath has kindly contributead the following pcb design:
Bottom view of the pcb.
Top view showing component placement.