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From: Paul Burridge
Subject: Re: Amplifying stage with *negative* Voltage gain??
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Date: Wed, 11 Dec 2002 09:50:27 +0000
NNTP-Posting-Date: Wed, 11 Dec 2002 11:18:47 GMT
Organization: Virgin Net Usenet Service
On Tue, 10 Dec 2002 16:21:21 GMT, analog opined
>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?
Right, I left the 10x probe clipped to the output of the buffer
When touching the x1 probe to the input, the output probe measures a
dramatic *increase* in amplitude by a factor of about 5. Is there such
a thing as "inverse loading"?
Now I really am baffled. :-(
"What is now proved was once only imagin'd"
- William Blake, 1793
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