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Twin T Filter and Oscillator PCB
This Twin-T op amp PCB acts as a bandpass filter with the default schematic components.
A Freq. adjust potentiometer sweeps the center frequency from around 500 Hz to around 2 KHz, which allows it to behave like a Wah-Wah effect when an audio signal is applied to the input.
If different components are used, the circuit can respond to a trigger pulse input instead of an audio input signal, and momentarily oscillate, generating tones including analog drum synth sounds.
The PCB was created as an experimenting platform. Instead of soldering all filter parts, round machine pin sockets can be used for the key resistor/capacitor components. This allows easily swapping the parts to use the circuit in different ways and quickly determine ideal component values.
Machine pin sockets hold onto the component leads better than dupont style headers.
https://youtu.be/s6U4tN_ZrB0
Twin T Filter and Oscillator PCB
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