https://github.com/kweiwen/benjolin

Rob Hordijk's Benjolin in the Eurorack format.
https://github.com/kweiwen/benjolin

Last synced: 18 days ago
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Rob Hordijk's Benjolin in the Eurorack format.

• Host: GitHub
• URL: https://github.com/kweiwen/benjolin
• Owner: kweiwen
• Created: 2016-07-07T12:00:23.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2023-12-08T08:57:21.000Z (11 months ago)
• Last Synced: 2024-07-31T22:46:07.313Z (3 months ago)
• Homepage:
• Size: 4.5 MB
• Stars: 109
• Watchers: 23
• Forks: 14
• Open Issues: 6
• Metadata Files:
  • Readme: README.md

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README

        
# Benjolin - Rob Hordijk's Benjolin in the Eurorack format 

* This is a DIY Eurorack project based on Rob Hordijk's Benjolin design.



# Modifications

* Addition of an external audio input for the filter.

* Voltage-controlled pitch for both oscillators.

* Voltage-controlled frequency for the low-pass filter.

* Disconnection of T2 from the filter (Note: T2 can still be connected to the filter's CV input via cable).

* Integration of an SPST switch to select the current input (P1 or a -9~9V voltage with a potentiometer) for the BC547.

# Voltage Outputs

* Tri1 Out: ~6Vpp

* Pul1 Out: ~12Vpp

* Tri2 Out: ~6Vpp

* Pul2 Out: ~12Vpp

* PWM Out: ~18Vpp

* Main Out: ~2Vpp

# Front Side of PCB 



# Back Side of PCB



# Building & Troubleshooting

For further details and guidance, please refer to our comprehensive guide available [here](https://github.com/kweiwen/benjolin/wiki).

# Acknowledgements

I extend my sincere gratitude to Rob for granting permission to adapt the Benjolin PCB for Eurorack use. His generosity is a significant contribution to the DIY synth community. His dedication and kindness are deeply appreciated.

# License

Hardware: cc-by-sa-3.0

By: Tseng Kweiwen