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Author Topic: logarithmic sweep generator?  (Read 2107 times)

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Offline ftransformTopic starter

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logarithmic sweep generator?
« on: December 10, 2012, 10:25:36 am »
So I was watching the bode plot analysis and unfortunately I only have a linear sweep.
Does anyone have suggestions for a circuit which can do a logarithmic sweep or a cheap suggestion?

From -10 to 10 V pp.
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Offline firewalker

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Re: logarithmic sweep generator?
« Reply #1 on: December 10, 2012, 10:33:39 am »
Is there a Voltage Frequency Control input present?

Alexander.
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Offline w2aew

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Re: logarithmic sweep generator?
« Reply #2 on: December 10, 2012, 04:50:33 pm »
Quote from: firewalker on December 10, 2012, 10:33:39 am
Is there a Voltage Frequency Control input present?

Alexander.

If so, you can make yourself a simple exponentially rising signal with a simple pulse generator (555 based even), into an RC circuit.  Then, buffer this to drive the frequency control voltage input on the FG.
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