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Subject: Re: Amplifying stage with *negative* Voltage gain??
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NNTP-Posting-Date: Tue, 10 Dec 2002 16:21:21 GMT
Organization: AT&T Broadband
Date: Tue, 10 Dec 2002 16:21:21 GMT
Paul Burridge wrote in part:
> On x10, the readings are now 2v p-p for sig in; 2.4v p-p for sig out.
> With x1, the readings are 8v p-p for Vin and 2.4v p-p for Vout.
Notice that the output readings are unchanged by the probe loading.
Perhaps your emitter follower is working properly and the raw
oscillator output is being changed by probe loading.
Per chance do you have a two channel oscilloscope so that you could
use the 10x probe to observe the effect of making and breaking the
connection of the x1 probe?
Even with only one 'scope channel you could still check the effect of
touching the 1x probe to the circuit at various places (with its ground
lead clipped to circuit ground as if it were being used normally, of
course). Just a thought. -- analog
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