Wednesday, January 26, 2011

Negative Supply voltage

Because we are going use the Adapters that are available in the laboratory we have only a positive voltage. For our project, the adapter needs to set to 12V.
But for the op-amps that we are using, we need a negatieve voltage of -12V.
We found a very simple circuit with a NE555. We builded it yesterday quickly and it works fine. We measured an output voltage of -11,62V. And the input voltage was 12,6V.
This is the circuit:














http://www.circuitsonline.net/schakelingen/139/voedingen/negatieve-spanning-met-ne555.html
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2 comments:

  1. watchout3January 30, 2011 at 8:46 PM

    Never heard of a rail to rail opamp, or a single supply opamp?????
    A cheap OpAmp like the lm358 will do the job.
    Input voltage range: 0V till Vcc - 1,5V

    ReplyDelete
  2. JongenDewalqueFebruary 2, 2011 at 5:40 PM

    To late ... We were started with the basic 741 because we knew that we have this one...
    In school is not always there what you want to use...

    ReplyDelete

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