opamp attenuate signal theory question
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Posted by panfilero on August 10, 2007, 6:48 pm
Please log in for more thread options 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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Posted by Rich Grise on August 10, 2007, 8:55 pm
Please log in for more thread options On Fri, 10 Aug 2007 15:48:59 -0700, panfilero wrote: http://www.google.com/search?q=voltage-divider Have Fun! Rich | |||||||||||||
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Posted by Eeyore on August 11, 2007, 12:08 am
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panfilero wrote: > 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? 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 | |||||||||||||
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Posted by JosephKK on August 11, 2007, 11:26 pm
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panfilero panfilero@gmail.com posted to sci.electronics.design: > 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 A resistor based divider is appropriate. | |||||||||||||
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>
> 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?