[SOLVED] Stepping down sinusoidal voltage

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manishanand14

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Hello Everyone!

We know that an non-inverting amplifier built around an op-amp will amplify the input AC waveform with some finite gain set by the resistors.

Do we have something to do the opposite thing say feeding 1V Amplitude/1000Hz AC waveform to some circuit and getting out 5mV Amplitude AC waveform. [ I don't want to use a voltage divider or a transformer]
 

NO WE cannotttt!!! there are BJT's, FET's etc inside amplifiers and it can never work other way around , for eg how can u get output from the gate of any mosfet ???? you certainly can't . you need a voltage divider or use a transformer
 

Hi,

you can build an inverting OPAMP circuit with a 200k input resistor and a 1000 Ohms feedback resistor.

Is this what you want?


Klaus
 
A gain of less than unity is possible for the inverting configuration. However, for the non inverting configuration the gain can never fall below unity for any value of resistance.
 
HTML: 
you can build an inverting OPAMP circuit with a 200k input resistor and a 1000 Ohms feedback resistor.

What about the stability issues? Will it be stable?
 

Hi,

it depends on the opamp.

look for unity gain stable opamps.

Klaus
 

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