| Stage | Detail | Status |
|---|---|---|
| create material | sch/pcb | OK |
| gerber | OK | |
| production | OK | |
| produced | OK | |
| delivered | Delivered |
| Test | Detail | Status |
|---|---|---|
| Initial Inspection | VCO | OK - bottom looks empty w/o gnd fill |
| Initial Inspection | VCF | OK - bottom looks empty w/o gnd fill |
| Very difficult to mount as footprints are getting over soldering points in many places | ||
| BP in the bottom | ||
| HP in the middle | ||
| LP on top | ||
| Initial Inspection | VCF SMD | OK - bottom looks empty w/o gnd fill |
| Initial Technical Test | VCO | SINE has PCB error - and Sine pot has +12V to chassis |
| Initial Technical Test | VCF | One pot gets -12v on chassis |
| Initial Technical Test | VCF SMD | |
| Initial Product Test | VCO | Nice - |
| Initial Product Test | VCF | |
| CV1 and CV2 works fine | ||
| Q is doing something | ||
| Uncertain if the freq pot is right | ||
| Initial Product Test | VCF SMD |
| Test | Detail | Status |
|---|---|---|
| Product Test | ||
| Product Test | ||
| Quality | ||
| Quality | ||
| Long Term Product Test | ||
| Power Draw | VCO | +12 4mA -12 |
| Power Draw | VCF | +12 8mA -12 |
| Power Draw | VCF SMD | +12 ?mA -12 |
-
Due to footprint one of the pots gets -12v on chassis
-
Sine signal is shorted to GND
-
Glide pot is reversed
-
Due to footprint one of the pots gets -12v on chassis
-
R127 - DNP (Do not populate)
-
R119 swap with 220nF-1uF to ac couple input stage
-
R126 swap with 1uF to ac couple input stage
Very difficult to mount as footprints are getting over soldering points in many places
- Remove output pots
- Collect jacks in the bottom
- Fix errors (glide, POT, PCB errors, footprint tightened)
- Consider removing sine shaper
Test some of the original designs for inspiration and reference.
| Stage | Detail | Status |
|---|---|---|
| create material | sch/pcb | produced Rev A |
| gerber | produced and uploaded RevA | |
| production | ordered | OK |
| produced | OK | |
| delivered | OK |
| Test | Detail | Status |
|---|---|---|
| Initial Inspection | THT VCF - Visual - Component Mounting | NOT OK |
| Initial Inspection | SMD VCF - Visual - Component Mounting | NOT OK |
| Initial Inspection | VCO - Visual - Component Mounting | OK |
| Initial Technical Test | THT VCF - Base operation | NOT OK |
| Knobs | Freq working for LP - Q for HP/BP - CV trim - not ok | |
| Initial Technical Test | SMD VCF | NOT TESTED |
| Initial Technical Test | VCO - Sine - Triangle - Square | OK |
| Trimmers | OK | |
| Knobs | OK | |
| Initial Product Test | VCO CV from LFO | OK |
| VCO Vactrol CV from LFO | no real effect with CV coupling |
| Test | Detail | Status |
|---|---|---|
| Product Test | VCF | |
| Product Test | VCO | Works nicely - frequency is a bit high |
| Quality | VCF | |
| Quality | VCO | |
| Long Term Product Test | VCO | OpAmp gets hot - esp if no output is conn to the square |
| Power Draw | VCO | 50-120mA depending on output... |
- C111 reverse polarity
- R102 should go from +10v to connection between R103 and R106 - and +10v sould not go to Q102 base - Critical
- R should go from +10v to connection between R and R - and +10v sould not go to Q base - Critical
- 470K values not correct for all resistors
- 0R values not correct - fixed in RevB
- Outputs should not be shorted to GND when not connected
- The filter needs adjustments and the feedback is not stable. a 56k from CV to base of Q102 helps a bit.
- Input circuit for CV needs rework
- Input series resistor and capacitor could be a good addon for the filter inputs
- Frequency adjust seems to work for LP only
- Q adjust is minor and seems to work on HP and a bit on BP
- Tweak values for better frequency range
- Op Amp can get hot
- Draws more power if nothing is inserted into the Square output?
Same schematic - different components - half the size
Based on a Thomas Henry schematic
