Constructing ab' with a NAND
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
|||||||||||||||||||||||||||||||||||||
|
Posted by Rikard Bosnjakovic on October 26, 2005, 6:10 am
Please log in for more thread options I'm designing a small alarm-circuit for a veroboard and I've run into a problem that I hope anyone can help me with. The truth table for triggering my alarm is this: a b trig alarm 0 0 0 0 1 0 1 0 1 <-- 1 1 0 That is, ab'. In the circuit I'm using a 74LS03 (quad 2-NAND O/C) and up to this moment three of the four gates are used. Because of the limitations of the project size I cannot add another IC to the board, but there is room for a couple of diodes and transistors. What I need to do is manually constructing the ab' output. Since I'm having a free NAND gate, I can invert either a or b to get 0/0 or 1/1 respectively, but I'm unable to get any further since I haven't been able to figure out what to do next. -- Sincerely, | http://bos.hack.org/cv/ Rikard Bosnjakovic | Code chef - will cook for food ------------------------------------------------------------------------ | |||||||||||||||||||||||||||||||||||||
|
Posted by Tim Williams on October 26, 2005, 3:40 am
Please log in for more thread options > In the circuit I'm using a 74LS03 (quad 2-NAND O/C) and up to this
> moment three of the four gates are used. Use a single transistor as inverter, or use the NAND as an inverter for DTL? Tim -- Deep Fryer: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms | |||||||||||||||||||||||||||||||||||||
|
Posted by Rikard Bosnjakovic on October 26, 2005, 5:36 pm
Please log in for more thread options
Tim Williams wrote: > or use the NAND as an inverter for DTL?
What's DTL? -- Sincerely, | http://bos.hack.org/cv/ Rikard Bosnjakovic | Code chef - will cook for food ------------------------------------------------------------------------ | |||||||||||||||||||||||||||||||||||||
|
Posted by John Fields on October 26, 2005, 1:10 pm
Please log in for more thread options
On Wed, 26 Oct 2005 17:36:32 GMT, Rikard Bosnjakovic >Tim Williams wrote:
> > > or use the NAND as an inverter for DTL?
>
>What's DTL? --- Diode-Transistor-Logic. -- John Fields Professional Circuit Designer | |||||||||||||||||||||||||||||||||||||
|
Posted by Rikard Bosnjakovic on October 26, 2005, 6:20 pm
Please log in for more thread options
John Fields wrote: Somehow I cannot follow these links. Doesn't work in either Mozilla's news-reader, Outlook express, Gnus or pine. Can you name the subject and date of the article? -- Sincerely, | http://bos.hack.org/cv/ Rikard Bosnjakovic | Code chef - will cook for food ------------------------------------------------------------------------ | |||||||||||||||||||||||||||||||||||||
| Similar Threads | Posted |
| Constructing ab' with a NAND | October 26, 2005, 6:10 am |
| Constructing a "delay" into a system? | August 26, 2008, 9:39 pm |
| need help with NAND datasheet | December 14, 2005, 3:24 pm |
| NAND output saturation and malformed signal from LP filter | October 8, 2006, 5:18 pm |
| Constructing a "Power on time delay relay" with 5 sec. delay. max 6V | July 10, 2005, 10:43 am |
| Universal logic modules vs NAND-like modules | May 15, 2005, 8:51 pm |
| 4 input NAND w/ 2 input NANDs? | September 20, 2005, 4:21 pm |
>
> a b trig alarm
> 0 0 0
> 0 1 0
> 1 0 1 <--
> 1 1 0