| ??? 09/30/08 21:22 Read: times |
#158707 - and the impulse for switching is... Responding to: ???'s previous message |
... presence of any reasonable SYNC in any channel. That's what the '51 is supposed to detect - e.g. pulses of around 1ms long, with repetition rate between 50-100Hz, on VSYNC. The channel where they appear is to be switched to the common output. You need to develop some strategy - either a priority ("if CH1 is on, it is always switched to output"), or first-win, or last-win - whatever you find appropriate for your application.
Richard Erlacher said:
The SYNC signals are, ISTR, LVCMOS-compatible. I would be careful not to load them too much, though. Some amplification might be appropriate - a simple transistor buffer, or a cheap opamp or comparator, would most probably do. JW |
| Topic | Author | Date |
| Vga combiner switch with MCU | 01/01/70 00:00 | |
| Not simple for quality signals | 01/01/70 00:00 | |
| Why do they call this a "combiner"? | 01/01/70 00:00 | |
| and the impulse for switching is... | 01/01/70 00:00 | |
| video combiner | 01/01/70 00:00 | |
| ICs?? | 01/01/70 00:00 | |
one example ... | 01/01/70 00:00 |