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PIC Synth

PIC based analog synth plans

Courtesy/Thanks to: Kevin (picsynth@yahoo.com)

Description: A real analog synthesizer to build. The two oscillators can be detuned for that classic synth sound.
DCO, VCF, Envelope, VCA, sawtooth, triangle,pulse.

http://picsynth.000space.com


Dual oscillator mono synth
Really easy to build using just 1 custom programmed PIC chip, 4 ICs and single 12v supply
All circuits built on veroboard - no printed circuit board making skills needed
PIC based dual oscillator and digital keyboard scan
Analog VCF/VCA/Envelope
Waveforms : sawtooth, square (with pulse width adjust), triangle
Fully adjustable detune

Arpeggiator and Portamento

The PIC chip is available from above site for $17 US.

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Files
backpanel.jpg
   Back of oscillator panel showing waveshape circuit. The dual waveshape circuit divides the PIC squar
filtamp.jpg
   Filter/Amplifier Module :
Attack, decay, filter cutoff frequency, master volume, filter voltage
oscpanel.jpg
   Oscillator Module :
Oscillator 1, range H/M/L, pulse width, waveform (ramp,square,triangle), tu
picboard.jpg
   PIC board, showing 18 pin PIC microcontroller and keyboard decoder.The PIC produces three outputs: t
circuit_description.txt
   Descriptions to accompany the photos
detunesaw.wav
   Detuned sawtooth, hear the detune
egypt.wav
   Two thin pulses. 1 Oscillator changes to M position near end
house.wav
   Made this up. Top key priority makes for eady playing
oxygene.wav
   Hey I never said I could play
filter.wav
   Detune + filter resonance high
techinfo.txt
   Technical Information on how the PICsynth chip works
lalala.wav
   la la la
electguitar.wav
   Electric Guitar
midsomer.wav
   Midsomer Murders
osc1andosc2.wav
   Playing with Osc1 and Osc2
oscmodfilter.wav
   Oscillator Mod Filter. Done with 1 more diode and resistor.
whole.jpg
   PICTURE OF WHOLE CIRCUIT
block.jpg
   Block Diagram
block.htm
   Block Diagram text
variation1.wma
   Variations around detune beats
spooky.wma
   New vibrato in PICSYNTH v2 chip
techinfov2.txt
   Technical info for V2 chip
picsynthschematicv2.jpg
   Latest PICSYNTH schematic CORRECTED
improv1.wma
   Longer demo of the sound of the PICsynth.
downbeat.mp3
   V3 Arpeggiator demo
rock.mp3
   V3 Arpeggiator demo
train.mp3
   V3 Arpeggiator demo
updown.mp3
   V3 Arpeggiator demo
picsynth_v3_chip.pdf
   PICsynth V3 chip information
glide.wma
   Example of portamento/glide
fat.wma
   Fat sound of new waveshaper, see BLOG on picsynth website
picsynthv3.jpg
   Latest schematic - V3
picsynthvcfvca.jpg
   Latest Veroboard layout for VCF VCA
step01vca.jpg
   VCF VCA step1
step02vca.jpg
   VCF VCA Step 2
step03vca.jpg
   VCF VCA Step 3
step04vca.jpg
   VCF VCA Step 4
step05vca.jpg
   VCF VCA Step 5
step06vca.jpg
   VCF VCA Step 6
step07vca.jpg
   VCF VCA Step 7
step08vca.jpg
   VCF VCA Step 8
step09vca.jpg
   VCF VCA Step 9
step10vca.jpg
   VCF VCA Step 10
step11vca.jpg
   VCF VCA Step 11
step12vca.jpg
   VCF VCA Step 12
pulsewidthmod.mp3
   Oscillator 3 Pulse Width Modulation
saw256stepandpwm.jpg
   Circuit to produce 256 step saw and PWM from square wave. Used as Oscillator 3.
strings.wma
   Strings. OSC1=Pulse,OSC2=Triangle,OSC3=PWM
picsynthwaveshaper.jpg
   Veroboard layout for the waveshaper
synthacon.mp3
   Synthacon filter sound
scales.mp3
   Modded Korg Monotron sample
space.mp3
   Modded Korg Monotron sample
1octave.mp3
   Modded monotron improvisation
medieval2voice.mp3
   Cello and flute sound
10ufcap.mp3
   Moving harmonics by adding 1 capacitor
picsynth2.jpg
   Build a PIC based synth
picsynth.pdf
   Schematics and connection diagram for the PIC-synth
Links
www.geocities.com/picsynth/
   PIC Synth site
Parts used
74HC154
   4-to-16 line decoder/demultiplexer
HEF 4520
   Dual binary counter
LM324
   Low Power Quad Operational Amplifier
LM78L05
   5V 3-Terminal Positive Regulators