I have been working on some simple sound making devices recently (4000 series cmos, lunetta synths) Now I know what you're going to say "please provide full circuit schematics etc etc" Unfortunately for you I don't have any, this is just for my devices in general, their output is about 0 to 10 volts, thats rail to rail.
Short version: How should one combine a voltage divider (for attenuation) and capacitor in order to remove any DC from a signal?
Long version: I intend to connect my sound machines to amplifiers and mixers but to avoid discombobulating them I intend to capacitively couple their outputs.
However the output voltage of many of my inventions is almost rail to rail, which is just too much for most amplifiers; they prefer around 100mV.
To remedy this I have used a voltage divider, if input voltage is about 10V, then a 10k resistor and 100 ohm resistor form a good enough divider to get the voltage down to a level my amplifiers can handle.
However if the output voltage has some DC offset (which it often does) this is also transfered out with the divider.
In what arrangement would one combine a voltage divider and capacitor to get rid of this DC offset but not filter the sound too much?
I was considering perhaps as a high pass filter but then you have a resistor effectively in series with the capacitor which will affect it's reactance, but should one merely adjust the capacitor untill suitable reactance at 20Hz is found?
I have found that a capacitor after the divider sort of works but often there is too much filtering.
What would you chaps suggest?
Short version: How should one combine a voltage divider (for attenuation) and capacitor in order to remove any DC from a signal?
Long version: I intend to connect my sound machines to amplifiers and mixers but to avoid discombobulating them I intend to capacitively couple their outputs.
However the output voltage of many of my inventions is almost rail to rail, which is just too much for most amplifiers; they prefer around 100mV.
To remedy this I have used a voltage divider, if input voltage is about 10V, then a 10k resistor and 100 ohm resistor form a good enough divider to get the voltage down to a level my amplifiers can handle.
However if the output voltage has some DC offset (which it often does) this is also transfered out with the divider.
In what arrangement would one combine a voltage divider and capacitor to get rid of this DC offset but not filter the sound too much?
I was considering perhaps as a high pass filter but then you have a resistor effectively in series with the capacitor which will affect it's reactance, but should one merely adjust the capacitor untill suitable reactance at 20Hz is found?
I have found that a capacitor after the divider sort of works but often there is too much filtering.
What would you chaps suggest?