[SOLVED] Stepping down sinusoidal voltage

[manishanand14]

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]

 

[Usama Siddiqui]

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

 

[KlausST]

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

 

[Y.SAI SARASWATHI]

Along with them you can also use attenuators that are usually used for measurements.

 

[mrinalmani]

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.

 

[manishanand14]

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?

 

[KlausST]

Hi,

it depends on the opamp.

look for unity gain stable opamps.

Klaus