Hello everybody,
I am trying to build an LED audio spectrum analyzer with 5 different band frequencies. For the actual filter i decided to use a gyrator circuit which utilises OpAmps and I came up with 2 diffrent designs. The first one is to just use 5 different gyrators for each band and the second design is to use only one gyrator and then using some kind of switch, be able to cycle through diffrent bands by changing only the resistors' values(basically a digital potentiometer as shown in the schematic). The problem i run into is choosing the actual switch since I want it to work at AC and not affect the rest of the circuit and mess up with the filtering. Each band will be updated 30 times per second which means that (since i have 5 bands) I'll need to change from band to band every 6ms roughly using some kind of controller (in the schematic shown as clock). What switch should i use and what are your opinions on the whole concept? Should I abort the second design entirely?
The schematic only has 3 switches for simplicity reasons. The finished version will contain 5 switches, one for each band.
Thanks,
Chris
I am trying to build an LED audio spectrum analyzer with 5 different band frequencies. For the actual filter i decided to use a gyrator circuit which utilises OpAmps and I came up with 2 diffrent designs. The first one is to just use 5 different gyrators for each band and the second design is to use only one gyrator and then using some kind of switch, be able to cycle through diffrent bands by changing only the resistors' values(basically a digital potentiometer as shown in the schematic). The problem i run into is choosing the actual switch since I want it to work at AC and not affect the rest of the circuit and mess up with the filtering. Each band will be updated 30 times per second which means that (since i have 5 bands) I'll need to change from band to band every 6ms roughly using some kind of controller (in the schematic shown as clock). What switch should i use and what are your opinions on the whole concept? Should I abort the second design entirely?
The schematic only has 3 switches for simplicity reasons. The finished version will contain 5 switches, one for each band.
Thanks,
Chris