• this is a diy eurorack project based on rob hordijk's benjolin

• an external audio input to filter
• the pitch is voltage controllable in both oscillator
• the frequency of low pass filter is voltage controllable
• disconnect t2 to filter (you can still use cable to connect t2 to filter's cv input)
• add a spst to switch the current input(p1 or -9~9v voltage with a potentiometer) to bc547

• tri1 out: ~6Vpp
• pul1 out: ~12Vpp
• tri2 out: ~6Vpp
• pul2 out: ~12Vpp
• pwm out: ~18Vpp
• main out: ~2Vpp

please check here for for more details.

thanks rob's permission allows me to run benjolin's pcb in eurorack, which is a gift to the diy synth community and i am truly grateful for his dedication and kindness.

hardware: cc-by-sa-3.0 by: tseng kweiwen