Circuit Skills: Perfboard Prototyping
Design a Prototype for Guitar Sound EffectBy Collin Cunningham
Make Magazine contributor Collin Cunningham shows us how to use a perfboard to design a prototype for guitar sound effects. Collin doesn't just make it fun but he makes it look easy.
Circuit Skills: Perfboard Prototyping Video
When you think "DIY electronics", one of the first images that likely comes to mind is of parts and wire soldered to a standard piece of perforated circuit board –– and that makes sense. Perfboard is widely used because it's so versatile. Essentially, it's just a grid of potential solder-point connections. You can trim it down to just the size you need or leave extra space for future enhancements, or revisions, if need be.
I demo my own approach to perfboarding by building a rather unusual guitar effect –– the PWM, a design I found in Tim Escobedo's excellent Circuit Snippets collection.
In order to get this thing making sound ASAP, I omitted the stompbox switch and its somewhat complex wiring. However, the optional LFO add-on seemed a bit too good to pass up, so I did incorporate that into my build.
I knew from previous projects that the 40106 Schmitt Trigger IC could make some cool experimental synth sounds. It turns out that the chip also works as a surprisingly sweet distortion pedal, if you're into that tough and spazzy fuzz-bot kind of sound (which I am). If you need a boost getting started with your layout, here's a basic diagram of all the on-board connections I made (just much neater than how I actually made 'em).
|Qty.||Part Description||Manufacturer Part No.|
|IC, LM386N-1/NOPB, DIP-8||LM386N-1/NOPB|
|IC, CD40106BE, DIP-14||CD40106BE|
|Transistor, 2N3904, TO-92||2N3904-R|
|Socket, IC, DIP-8, Machine Tooled||6100-8-R|
|Socket, IC, DIP-14, Machine Tooled||6100-14-R|
|Diode, Silicon, Rectifier, 1N4001, 1A, 50V||1N4001|
|Resistor, 47KΩ, 1/4 Watt, 5%||CF1/4W473JRC|
|Resistor, 33KΩ, 1/4 Watt, 5%||CF1/4W333JRC|
|Capacitor, Electrolytic, Radial, 22μF, 50V||R22/50-VP-R|
|Capacitor, Electrolytic, Radial, 2.2μF, 50V||R2.2/50-VP-R|
|Capacitor, Electrolytic, Radial, 100μF, 50V||R100/50|
|Capacitor, Film, Radial, 0.1μF, 50V||ECQ-V1H104JL|
|Capacitor, Ceramic, Radial, 0.0047μF, 50V||DC.0047|
|Potentiometer, 500K, Linear, 16mm, 1/8 Watt||RV24AF-10-15R1-B55|
|Potentiometer, 10K, Linear, 16mm, 1/8 Watt||RV16AF-10-20R1-B14|
|Potentiometer, 100K, Audio, 16mm, 1/4 Watt||RV24AF-10-15R1-A15|
|Connector, 9V Battery, Safety Snap||SBS-IR-1-R|
|Connector, 1/4" Phone Jack, 2 Position, Solder Lug, Panel Mount||11|
|Connector, 1/4" Phone Jack, 3 Position, Solder Lug, Panel Mount||12B|
|Protoboard, 2.4" x 3.4"||PCB-102-R|
Other Circuit Skills DIY Videos by Collin:Circuit Board Etching
Function Generator and Enclosures
Infrared Light Barrier
LED Color Organ
Pulse Width Modulation
Surface Mount Devices
LED Matrix Kit