Awesome
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
<img src="https://cloud.githubusercontent.com/assets/15021145/25553008/ec268f5e-2cda-11e7-9e3f-ba969d126c5f.png" width="480">Back Side of PCB
<img src="https://cloud.githubusercontent.com/assets/15021145/25553009/ec29c958-2cda-11e7-9693-ededf0ead895.png" width="480">Building & Troubleshooting
For further details and guidance, please refer to our comprehensive guide available here.
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