HP-25C Eumulator
|
11-20-2014, 04:10 PM
Post: #93
|
|||
|
|||
RE: HP-25C Eumulator
(11-20-2014 03:42 PM)Didier Lachieze Wrote: The legends with the low-profile keys look very good !Yes, I am surprised that the whole thing is so much lighter too! May be I can send it as Letter mail. It's just that there is no easy (and cheap) way to do multi-color silk-screen prints as they use special inks. Otherwise it would be much prettier. Quote:(11-20-2014 03:03 PM)Chris Chung Wrote: If you plan to use IC sockets, you should get the "machined pin" ones (round) instead of these cheap ones.Do you have any reference example for these ? It's just for kit builders who want to have sockets. The socket w/ the rounded pins are machined. It does not matter much on all digital circuits. But for analog circuitry it may affect performance. In my design I use a RC delay trick to push bits into the 74HC164 shift register (for led segments). I need it to save one IO pin. And the cheaper sockets can affect the RC timing. I had previous head-scratches during prototyping when things works w/o socket and fails w/ socket. Actually if I use a Atmel mega328/168 (28 pins), the circuit will be cleaner and reduce to just 1 IC (no shift register needed). But I haven't use AVRs for quite awhile now and it's more interesting to do it w/ an MSP430. |
|||
« Next Oldest | Next Newest »
|
User(s) browsing this thread: 2 Guest(s)