Building the Boldport Krell - a handheld DSP synthesiser built around a Microchip dsPIC and a design from madlab.
Here’s a quick demo..
Krell is a handheld DSP synthesiser. Buttons and potentiometers dial up a range of sounds. The Boldport project is a remix of a soldering project by James Hutchby of MadLab.
At the core of the circuit is a Microchip dsPIC33EP128MC202-I/SP. It’s an interesting choice - a digital signal controller that is really designed for precision motor control, now put in service of creating music (or at least weird sounds).
|x1||dsPIC microntroller, Microchip dsPIC33EP128MC202-I/SP|
|x1||3.3V Regulator, TI LP2950-33LPRE3|
|x1||NPN bipolar transistor, ON BC547CTFR|
|x1||220μF electrolytic capacitor, Multicomp MCUMR6V3227M6.3X5|
|x2||10μF electrolytic capacitor, Multicomp MCUMR16V106M4X5|
|x1||10μF tantalum capacitor, Suntan TS19001C100MSB0A0R|
|x3||100nF capacitor, Suntan TS170R1H104MSBFB0R|
|x6||47KΩ trimmer, Piher PT10MV10473A2020-I-PM-S|
|x6||Black thumbwheel, Piher 5034|
|x4||White LED, Valcon VDIFFLED-3mm-W|
|x2||100Ω resistor, Multicomp MCF 0.25W 100R|
|x1||1KΩ resistor, Multicomp MCF 0.25W 1K|
|x6||10KΩ resistor, Multicomp MCF 0.25W 10K|
|x1||Battery holder, TruPower BH 431-1P|
|x1||3.5mm stereo jack socket, TruConnect 20-0137|
|x1||28-pin DIP socket, TruConnect 22-0114|
|x1||DPDT slide switch, C&K JS202011SCQN|
|x1||Button sheet, Snaptron Peel-N-Place™|
My quick re-draw of the circuit..
It’s a nice simple build this time for just an iron and my favourite 2% Ag solder.
The Snaptron buttons are an interesting construction variation: they come preset with clear adhesive strip. With careful alignment, all buttons stick in place with no soldering required. I can see this being super efficient for small batch assembly.
The finished noise maker..