http://www.learningelectronics.net/circuits/whistle-responder-schematic-circuit.html
I want to build this circuit, but his output will go to a micro controller.
First step
When I whistle to flash an LED
a) I not understand, how a logic gate is a use as operational amplifier (IC1A)
b) How do I change the filter to change the crossover frequency (IC1B)
c) Know such a scheme with fewer components ?
d) Instead of 4049 (NOT) can use CD4093(NAND)?
I want to build this circuit, but his output will go to a micro controller.
First step
When I whistle to flash an LED
a) I not understand, how a logic gate is a use as operational amplifier (IC1A)
b) How do I change the filter to change the crossover frequency (IC1B)
c) Know such a scheme with fewer components ?
d) Instead of 4049 (NOT) can use CD4093(NAND)?