1.2 KiB
Resistor Values and Combinations
The schematic calls for resistor values that are not available to us without some light sorcery. This is an attempt.
Every resistor from the pack is rated for 0.25W and has a tolerance of \pm5%. Want to figure out how that could affect my calculations? Me neither.
90Hz-110Hz
low-pass
(120 \parallel 47) + 3.3 = 37.072 \Omega
high-pass
(68 \parallel 47) + (470 \parallel 2.2) = 28.245 \Omega
290Hz-310Hz
low-pass
(220 \parallel 68) + 2.2 + 1 = 55.144 \Omega
high-pass
Luckily, we already have 47 \Omega resistors.
950Hz-1050Hz
low-pass
(22 \parallel 47) + 2.2 = 17.186 \Omega
...or alternatively:
(10 \parallel 10) + 10 + 1 + 1 = 17 \Omega
high-pass
(10 \parallel 10) + 10 = 15 \Omega
3.2kHz - 3.4kHz
low-pass
47 + 1 + 1 = 49 \Omega
high-pass
22 + 22 + 1 + 1 = 46 \Omega
...no one ever said we had to be clever.
9khz - 11khz
low-pass
(10 \parallel 10) + (68 \parallel 3.3) + 10 = 18.147 \Omega
high-pass
(22 \parallel 22) + 1 + 1 + 1 = 14 \Omega
Bonus: some fun(?) and useful(?) resistor values
(10 \parallel 10) = 5 \Omega
(220 \parallel 22) = 20 \Omega
(22 \parallel 22) = 11 \Omega
(100 \parallel 150) = 60 \Omega