Uploaded June 2021 | Updated September 2026, 2 weeks ago
PCBWay Supports High Precision Advanced PCBs: pcbway.com
The Twin T circuit can be used as a notch filter, a band pass filter, or an oscillator.
This PCB was designed to allow swapping components with round machine pin sockets to tweak a band pass filter.
There is a potentiometer for adjusting filter center frequency (useful as a wah effect).
With the right part values, it can become an externally triggered oscillator, which may work as an analog drum synth (still working on finding the right values).
0:00 Twin T introduction
0:30 Schematic Briefing
2:06 LT Spice Observation
3:20 Wah Talk
4:22 Circuit Tweaking
5:35 Signal gen quick test
6:01 Wah effect test with guitar track
6:25 Oscillator experiments
Schematic (slightly tweaked since video was made) github.com/GadgetReboot/TwinT
Bare PCB pcbway.com/project/shareproject/Twin_T_Filter_and_Oscillator_PCB.html
Twin T Notch Filter Info on second ch: youtube.com/watch?v=U4XYOsSYd6g
Wah info
en.wikipedia.org/wiki/Wah-wah_pedal
geofex.com/article_folders/wahpedl/voicewah.htm
sim.okawa-denshi.jp/en/TwinTCRtool.php
Twin T Info
https://lookmumnocomputer.discourse.group/t/simple-twin-t-kick-drum/2460
paia.com/syndrum
geofex.com/article_folders/eqs/paramet.htm
https://www.ieee.li/pdf/viewgraphs/filter_design_configurations.pdf
If you'd like to support the channel, you can:
Support me on Patreon: patreon.com/gadgetreboot
Shop through my affiliate links!
Banggood banggood.com/custlink/3vKYLANH8N
Aliexpress https://s.click.aliexpress.com/e/_AFeHwB
Amazon.com amazon.com/?&_encoding=UTF8&tag=gadgetreboo05-20&linkCode=ur2&linkId=952875a3564e2204d1786f94b9e1a8d3&camp=1789&creative=9325
Amazon.ca amazon.ca/?&_encoding=UTF8&tag=gadgetreboot-20&linkCode=ur2&linkId=70fa82315ac48f03342938bd4fb93535&camp=15121&creative=330641
Videos are mirrored at LBRY/Odysee: odysee.com/@GadgetReboot:4
PCBWay Supports High Precision Advanced PCBs: pcbway.com
The Twin T circuit can be used as a notch filter, a band pass filter, or an oscillator.
This PCB was designed to allow swapping components with round machine pin sockets to tweak a band pass filter.
There is a potentiometer for adjusting filter center frequency (useful as a wah effect).
With the right part values, it can become an externally triggered oscillator, which may work as an analog drum synth (still working on finding the right values).
0:00 Twin T introduction
0:30 Schematic Briefing
2:06 LT Spice Observation
3:20 Wah Talk
4:22 Circuit Tweaking
5:35 Signal gen quick test
6:01 Wah effect test with guitar track
6:25 Oscillator experiments
Schematic (slightly tweaked since video was made) github.com/GadgetReboot/TwinT
Bare PCB pcbway.com/project/shareproject/Twin_T_Filter_and_Oscillator_PCB.html
Twin T Notch Filter Info on second ch: youtube.com/watch?v=U4XYOsSYd6g
Wah info
en.wikipedia.org/wiki/Wah-wah_pedal
geofex.com/article_folders/wahpedl/voicewah.htm
sim.okawa-denshi.jp/en/TwinTCRtool.php
Twin T Info
https://lookmumnocomputer.discourse.group/t/simple-twin-t-kick-drum/2460
paia.com/syndrum
geofex.com/article_folders/eqs/paramet.htm
https://www.ieee.li/pdf/viewgraphs/filter_design_configurations.pdf
If you'd like to support the channel, you can:
Support me on Patreon: patreon.com/gadgetreboot
Shop through my affiliate links!
Banggood banggood.com/custlink/3vKYLANH8N
Aliexpress https://s.click.aliexpress.com/e/_AFeHwB
Amazon.com amazon.com/?&_encoding=UTF8&tag=gadgetreboo05-20&linkCode=ur2&linkId=952875a3564e2204d1786f94b9e1a8d3&camp=1789&creative=9325
Amazon.ca amazon.ca/?&_encoding=UTF8&tag=gadgetreboot-20&linkCode=ur2&linkId=70fa82315ac48f03342938bd4fb93535&camp=15121&creative=330641
Videos are mirrored at LBRY/Odysee: odysee.com/@GadgetReboot:4
