Stickman393
Well-known member
Just some questions...
I've been trying to wrap my head around input impedance, but the concept is still pretty abstract and fuzzy to me.
So let's look at an example...schematics at the bottom...
The Roboto, from pedal PCB, has a buffer section before the input of of the HT8950. DC blocking caps...or whatever you might call them...
Alternatively, velleman makes a little DIY kit for a "robot voice changer" that uses the HT8950A. That one uses a tiny board mounted microphone, but only places a resistor and a cap between the mic and the chip input.
My question is...what considerations does a designer take into account when looking at the input source? Is there a reason that one would use a buffer in the guitar input, but not in the mic input? Or did velleman go this route simply to reduce cost and parts count?
Any references to good reading materials would be appreciated...or words of wisdom that help me wrap my head around this...
I've been trying to wrap my head around input impedance, but the concept is still pretty abstract and fuzzy to me.
So let's look at an example...schematics at the bottom...
The Roboto, from pedal PCB, has a buffer section before the input of of the HT8950. DC blocking caps...or whatever you might call them...
Alternatively, velleman makes a little DIY kit for a "robot voice changer" that uses the HT8950A. That one uses a tiny board mounted microphone, but only places a resistor and a cap between the mic and the chip input.
My question is...what considerations does a designer take into account when looking at the input source? Is there a reason that one would use a buffer in the guitar input, but not in the mic input? Or did velleman go this route simply to reduce cost and parts count?
Any references to good reading materials would be appreciated...or words of wisdom that help me wrap my head around this...