Difference between revisions of "SYNTH-VCO-01"
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[[file:VCO-01_sine.png]] | [[file:VCO-01_sine.png]] | ||
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! OCT_SW | ! OCT_SW | ||
! MEASURE (Hz) | ! MEASURE (Hz) | ||
| − | ! | + | ! SIG TYPE |
| + | |- | ||
| + | | 0 | ||
| + | | 1.61 | ||
| + | | CCW | ||
| + | | CENTER | ||
| + | | CENTER | ||
| + | | CENTER | ||
| + | | 261.4 | ||
| + | | SINE MIDDLE C | ||
|- | |- | ||
| 0 | | 0 | ||
| Line 77: | Line 81: | ||
| CENTER | | CENTER | ||
| 70.5 | | 70.5 | ||
| + | | SINE | ||
| + | |- | ||
| + | | 0 | ||
| + | | 0 | ||
| + | | CCW | ||
| + | | CW | ||
| + | | CENTER | ||
| + | | CENTER | ||
| + | | 107.9 | ||
| SINE | | SINE | ||
|- | |- | ||
| Line 167: | Line 180: | ||
| CENTER | | CENTER | ||
| 2441 | | 2441 | ||
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| SINE | | SINE | ||
|- | |- | ||
Revision as of 16:18, 11 October 2022
Contents
Features
- Build of Pico VCO by HAGIWO
- Digital Voltage Controlled Oscillator (VCO)
- Three modes: Wavefold, FM and AM
- PWM output with 2 pole low pass filter
- Each mode has eight built-in waveforms
- XIAO RP2040 CPU
- (5) Pushbuttons
- Octave Up/Down
- Mode Up/Down (Wavefold, FM and AM)
- Push Timbre switches between 8 waveforms
- (2) Knobs
- Freq fine adjust
- Mod adjust
- Standard EuroRack 16 pin header
- Supports 12V in with on-board 5V regulator
- 5V regulator can be not installed if 5V is available on EuroRack connection
- Card is not a Eurorack card
- Probably too deep, needs cabling
- (4) 6-32 mounting holes
- Stacks with SYNTH-MIDI-CTL-01 card
XIAO RP2040 Pins
- Pin 1, GP26 = Vol/Oct, Analog In
- Pin 2, GP27 = Freq Pot, Analog In
- Pin 3, GP28 = Mod, Analog In
- Pin 4, GP29 = Mod Pot, Analog In
- Pin 5, GP6 = Timbre Pushbutton, select waveform type, Digital Input
- Pin 6, GP7 = Gate (optional), Digital Input
- Pin 8, GP1 = Octave Down, Digital Input
- Pin 9, GP2 = Audio Output, PWM out
- Pin 10, GP4 = Mode Down, Digital Input
- Pin 11, GP3 = Mode Up, Digital Input
- Pin 12 = +3.3V
- Pin 13 = GND
- Pin 14 = +5V
Software
Videos
Checkout/Testing
- Nice sine wave
- Very little noise
| MOD_CV | FREQ_CV | MOD_POT | FREQ_POT | MODE_SW | OCT_SW | MEASURE (Hz) | SIG TYPE |
|---|---|---|---|---|---|---|---|
| 0 | 1.61 | CCW | CENTER | CENTER | CENTER | 261.4 | SINE MIDDLE C |
| 0 | 0 | CCW | CCW | CENTER | CENTER | 70.5 | SINE |
| 0 | 0 | CCW | CW | CENTER | CENTER | 107.9 | SINE |
| 0 | 0 | CCW | CCW | UP | CENTER | 66 | WAVEY-SAW |
| 0 | 0 | CCW | CCW | UP | CENTER | 70.5 | SAW |
| 0 | 0 | CCW | CCW | CENTER | DOWN | 35.4 | SINE |
| 0 | 0 | CCW | CCW | CENTER | UP | 141.6 | SINE |
| 0 | 0 | CCW | CCW | CENTER | CENTER | 70.5 | SINE |
| 1 | 0 | CCW | CCW | CENTER | CENTER | 142.9 | SINE |
| 2 | 0 | CCW | CCW | CENTER | CENTER | 293.4 | SINE |
| 3 | 0 | CCW | CCW | CENTER | CENTER | 598.4 | SINE |
| 4 | 0 | CCW | CCW | CENTER | CENTER | 1200 | SINE |
| 5 | 0 | CCW | CCW | CENTER | CENTER | 2441 | SINE |
Issues
Rev 1
- Working/no functional issues
- Mode/Oct switches s/b 3 way toggle with center off
- R13 s/s has 330K, s/b 33K
- R14 s/s has 220K, s/b 22K
- C6 s/s hard to see
- OpAmp U2 uses wrong schematic symbol
- ADD WIRE U2-1 TO U2-6 (VOUT) ON REAR
- ADD WIRE U2-7 TO U2-5 (VCC) ON REAR
- LIFT IC U2-2
- LIFT IC U2-4
- ADD WIRE IC U2-2 TO SOCKET U2-4
- ADD WIRE IC U2-4 TO SOCKET U2-2
- Works with rework
