# voltage levels conversion circuit

Discussion in 'General Electronics Chat' started by Ataleph, May 10, 2010.

1. ### Ataleph Thread Starter Active Member

Apr 20, 2009
31
0
Hi all,
Please, help me with a circuit(at transistor level) which should convert a signal with logical "0"=0V and logical "1"=1.2V(or 0.9V) to a signal with logical "0">=0.3V (but not greater than 0.7V) and logical "1"=1.2V. I have two types of supplies 0.9V and 1.2V, any of which can be used or both.

2. ### SgtWookie Expert

Jul 17, 2007
22,182
1,728

Is this a homework assignment, by any chance?

3. ### Ataleph Thread Starter Active Member

Apr 20, 2009
31
0
Thanks for re-phrasing. Now it is much clearer. I hope someone will provide the solution.

4. ### retched AAC Fanatic!

Dec 5, 2009
5,201
312
What have you done so far? Where are you getting stuck?

5. ### Ataleph Thread Starter Active Member

Apr 20, 2009
31
0
So far I have nothing. I need the conceptual design itself, than I will be able to give appropriate values to devices (sizing etc.).

6. ### SgtWookie Expert

Jul 17, 2007
22,182
1,728
Is this an assignment given to you by a teacher/instructor/professor?

7. ### Ataleph Thread Starter Active Member

Apr 20, 2009
31
0
No, I just need it for a circuit I am building. Why are you asking

8. ### SgtWookie Expert

Jul 17, 2007
22,182
1,728
I'm asking because it rather sounded like such a project.

See the attached; it's merely a simulation. Your mileage with actual components may vary.

The incoming sawtooth wave is 20kHz. At low speeds, the switching occurs at 0.9v; but at 20kHz you can see the level is a bit off. It doesn't work at all at 100kHz.

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9. ### retched AAC Fanatic!

Dec 5, 2009
5,201
312
We want to know where to file the thread.

Where is the signal you want to boost or adapt coming from? A sensor of some kind?

Do you need the output linear over the range, or just 2 outputs 0v and 1.2v

10. ### Ataleph Thread Starter Active Member

Apr 20, 2009
31
0
Thanks SGTWookie,
That's what I need.