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

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ipcepld

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ttl to 12v

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

secmig

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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

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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? :oops:
 

Rostfrei

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Use MAX232 chip.

Regards,
 

yuanxiaowei

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

btbass

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Use cmos 4050, Hex noninverting buffer & TTL driver!
 

Free_Will

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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

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use 4504 cmos ic
 

dkace

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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

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dkace said:
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

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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

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I totally agree.
 

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