AltAudio
New Member
Hello,
I am trying to design an audio low pass filter that lets kick drum and percussion through but not much else, perhaps something like 40Hz. I am using a 1/8" output from portable CD player. With multimeter, the 1/8" output shows an impedance of 474Ω when + lead is on tip(of tip-ring-sleeve configuration) and - lead on sleeve, and 170Ω when + lead is on ring and - lead on sleeve.
Reading through post from Russlk - https://www.electro-tech-online.com/threads/low-pass-audio-filter.13192/, I wonder if this configuration will work with impedance I have on my circuit board. The load impedance is quite low though, as I am using an op amp(LM 386N 440mW) to boost the audio signal and output as electical impulse through electrode. So fidelity is not an issue, I just need the low end to pass through.
Many thanks for your consideration.........Mickey
I am trying to design an audio low pass filter that lets kick drum and percussion through but not much else, perhaps something like 40Hz. I am using a 1/8" output from portable CD player. With multimeter, the 1/8" output shows an impedance of 474Ω when + lead is on tip(of tip-ring-sleeve configuration) and - lead on sleeve, and 170Ω when + lead is on ring and - lead on sleeve.
Reading through post from Russlk - https://www.electro-tech-online.com/threads/low-pass-audio-filter.13192/, I wonder if this configuration will work with impedance I have on my circuit board. The load impedance is quite low though, as I am using an op amp(LM 386N 440mW) to boost the audio signal and output as electical impulse through electrode. So fidelity is not an issue, I just need the low end to pass through.
Many thanks for your consideration.........Mickey