how to convert 0V--12V DC signals to TTL?

[ipcepld]

ttl to 12v

Is there a chip having the function? please inform me,thanks a lot.

 

[secmig]

convert -12volt to +12v

With resistor division? You could also use an opamp circuit that has a gain below 1. Any requirements on the loading of the 12 V signals?

secmig

 

[VoidMain]

The are at least 4 stupid but effective ways, without special chips:

1. divider network with 2 resistors
2. resistor + 5V1 Zener
3. NPN inversor w. C pull-up to 5V, + maybe another inversor
4. Optocoupler

Is this what you want or are you looking for something more sophisticated?

 

[Rostfrei]

Use MAX232 chip.

Regards,

 

[yuanxiaowei]

use LM393 to configure a voltage comparator.
the output of LM393 is pulled up to +5v by a resistor.

 

[btbass]

Use cmos 4050, Hex noninverting buffer & TTL driver!

 

[Free_Will]

Do not use resistor divider

I dont prefer voltage divider with resistors.Because there will be always a current even if your TTL dont use 5V.Thus if you use a battery the life of battery will be short!

 

[7rots51]

use 4504 cmos ic

 

[dkace]

Any electronic book of basic electronics has all the ways VoidMain is suggesting! What is more you can build protection circuits only by reading some chapters ahead! Try Sedra /Smith Microelectronics Circuits, or any spice library. That is if you want to build something for educational reasons- which I thing you shoyld- before using any IC! Good luck!

 

[klugkopf]

Any electronic book of basic electronics has all the ways VoidMain is suggesting! What is more you can build protection circuits only by reading some chapters ahead! Try Sedra /Smith Microelectronics Circuits, or any spice library. That is if you want to build something for educational reasons- which I thing you shoyld- before using any IC! Good luck!

True, but reuse and modularization is OK, sometimes.

 

[dkace]

No problem with modularization klugkopf but I thought that he wants this transaction from 12V to TTL just for educational reasons.Otherwise there would have been a more specific request on the matter! Modularization - if I understand well your meaning - is for people well understanding electronics and seeking fast solutions to their circuits!

[/quote]

 

[klugkopf]

I totally agree.