| ??? 04/24/11 00:25 Modified: 04/24/11 00:29 Read: times |
#182003 - As I understand the 'HC573.... Responding to: ???'s previous message |
As I understand the 'HC573 the circuit logic seems correct. There are several things to consider though...
1) I think you could run into some trouble if you tried to daisy chain one of these opto-isolated buffers behind another one of the same design. 2) You should study the H->L and L->H propagation delay skew of the opto coupler to make sure it does not distort the MIDI waveform too much. More than 3 or 4% distortion could make it hard for the downwind UART to reliably detect the data. 3) I see no problem with adding a second 'HC573. Worst case is that you would have to lower the 10K resistor some so that the rise time speeds up with the added capacitance of another 8 chip inputs. Mike Karas |
| Topic | Author | Date |
| MIDI Splitter/Repeater circuit | 01/01/70 00:00 | |
| I'm not sure if this name is right | 01/01/70 00:00 | |
| Thank you... and about the circuit? | 01/01/70 00:00 | |
| A and B sounds differential and with this ... | 01/01/70 00:00 | |
| Nothing differential at all | 01/01/70 00:00 | |
| Use suitable buffer.... | 01/01/70 00:00 | |
| IC choose | 01/01/70 00:00 | |
| As I understand the 'HC573.... | 01/01/70 00:00 | |
| As I understand the 'HC573.... | 01/01/70 00:00 | |
| Opto | 01/01/70 00:00 | |
6N138 | 01/01/70 00:00 |