opamp attenuate signal theory question

Aug 10, 2007 3 Replies

hello,



i am trying to make an oscillator that I can plug into a guitar amp (or keyboard or bass amp). i made an oscillator, but the amplitude of the signal is way too big, 9 volts, i was wondering how i could bring this signal down to the millivolts level (i think that's typical for keyboard amps)..... could i just stick a resistor at the end of my output.... for some reason I feel weird about doing that.... like thinking that maybe I need a buffer in there, that if I do just put a resistor at the output of my oscillator that that when i do hook the circuit up to a load (the guitar amp) that it would change the signal.... like it wouldn't be consistent but instead dependent on the load..... could anybody help me out with this?



thanks joshua



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Have Fun! Rich

You need a resistor like the one you mention AND another resistor to ground. This makes a 'voltage divider' that attenuates the signal.

To attenuate from volts to millivolts you need a ratio of 1000:1.

I suggest you connect a 47k resistor to the oscillator output. Connect the end of that to a 47 ohm resistor and connect the other end of the 47 ohm resistor to ground. Take the signal from the junction of the two resistors.

Graham

To

panfilero snipped-for-privacy@gmail.com posted to sci.electronics.design:

A resistor based divider is appropriate.

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