Analog Lab 6

Charlie Reynolds

Capacitor Notes:

• Camera flash can use capacitors to charge up and discharge when voltage is needed

10 Ω –> 20000Hz 10000 Ω –> 20 Hz

2a) Corner Frequency = 1/(2*pi*R*C)

1/(2*3.14*10Ω * 1μF) = 15,923.6 ~ 20000 Hz

1/(2*3.14*10000 Ω * 1μF) = 15.92 Hz ~ 20 Hz

2b) Low Pass Filter:

2b) High Pass Filter:

1/(2*3.14*10000 Ω * 1μF) = 15.92 Hz ~ 20 Hz

1/(2*3.14*10Ω * 1μF) = 15,923.6 ~ 20000 Hz

Part 3) Add a switch to switch between the highpass and lowpass.

Part 4) Answer This Question

You’ve made a 6db/octave filter.  Say you want to make a 12db/octave filter.  Or an 18db or 24db/octave filter?  What do you do?

In order to change the db per octave you will need to add an additional RC circuit of the same value to add an additional 6db/octave of rolloff.

Part 5) Start Contemplating Final Projects

a) For my project, I want to build a basic synthesizer with multiple oscillators and a few effects. I’m hoping to figure out ways to make the tone of the synth to sound clear and nice.

b) A more complicated synth would be either an octave or twelve tone synth with playable keys. I think it would take more time to get right, but could make a compelling final project. This along with some basic audio effects would be an interesting project.

c) Some professional analog audio electronics I would like to better understand or maybe even build are effect pedals and synths. I want to better understand the schematics and application of both.

Part 7) Troubleshooting

Had some initial problems setting up the configuration of the how and high pass filters together i.e. capacitor and potentiometer placement, but eventually got it.