| ??? 08/10/10 22:31 Read: times |
#177937 - Does it actually work? Responding to: ???'s previous message |
Nathan Spinuzzi said:
I found an old electronic typewriter... Bruce Revor said:
Hey I think Ive seen that board before. From a SCM typewriter someone asked me to look at. It was completley dead. Turned out the transformer and bridge supplied 24 V. DC that operated the motors and printhead, Then a switching regulator took the 24 V. and dropped it down to 5 V. for the micros. Of course when the switcher failed shorted the micros got hit with 24 V. Bad design a shorted transistor and the typewriter was trash.http://www.8052.com/forumchat/read/177918 So the first question, of course, is: does this typewriter actually work? What if it's in your junk van precisely because it is junk?! Even if it appears to work on a quick trial, how can you be sure that there hasn't been some subtle damage that doesn't cause an obvious fault to the typewriter function, but could really mess-up your experiments? This is just one of the many things that could make this "very painful and difficult" in Richard's words... |
| Topic | Author | Date |
| Should I make an 8052 SBC from an old typewriter? | 01/01/70 00:00 | |
| No! | 01/01/70 00:00 | |
| P8032AH, P8052AH | 01/01/70 00:00 | |
| No | 01/01/70 00:00 | |
| Be kind to yourself! | 01/01/70 00:00 | |
| Thoroughly agreed! | 01/01/70 00:00 | |
| It will cost you more than .... | 01/01/70 00:00 | |
| Avoid MAX232? | 01/01/70 00:00 | |
| so would I, but | 01/01/70 00:00 | |
| Board | 01/01/70 00:00 | |
| Very Steampunk! | 01/01/70 00:00 | |
| Does it actually work? | 01/01/70 00:00 | |
Yes, it works! | 01/01/70 00:00 |