Benutzer:Felicia/Modular-Synth/VCO
This is the VCO module, as per YuSynth VCO Website.
Construction
- I've etched a PCB with the original PCB provided by Yves
- The board was populated, soldering pad size was very good, so this was done in about two hours
- The panel was made of 2mm wood, hand-marked and drilled holes for the panel elements. The front panel design was made by myself and printed onto Zweckform 3487 white plastic sheets using a CLP-315 color laser printer. It was glued with "spray glue" onto the wooden panel.
It is noteworthy that the etching and soldering the PCB took only about 3 hours, while creating the front panel and wiring the connections took about at least 6 hours. Overall build time was 9-10 hours, planning time was the same amount.
I also thought that I probably want an aluminium front panel, but due to the very good results with the plastic sheets, I probably will stick to them for cost reasons. The 2mm wood panel also seems to be quite solid.
Construction Troubles
There are several issues:
- Much wiring is done at the panel itself. This makes it hard to swap the front panel with a more robust one. When I'm building other YuSynth modules, I'll re-design the PCB first to have one connector for each front panel element, even if it might bring a bit of noise into the system.
- Because I didn't like wiring behind the front panel, I added a separate PCB where I bring connected front panel elements together.
- Another thing to add to the PCB would be having the octave switch and sync connectors optional, so one can decide to skip or implement both switches by connecting a jumper and a set of connectors.
- Because I'll re-layout the modules anyways, I have an idea of adding a PSU adaptor to each board, so I can build one board and use several different power connectors.
- The schematic contains resistor names, but they are missing from the boards. So it is very hard to debug because only values, not names, are printed on the PCB.
Issues
- After the build, the VCO works! No magic smoke ;)
- The sine looks very odd. Negative curve looks good, positive curve looks strange. Seems like the positive Voltage breaks, probably a swapped resistor on the board, or the lab PSU doesn't work too well...need to investigate
- Saw looked good, don't remember tri and pulse.
- Octave switch is not connected yet, as I wanted to have the board working first.
Parts List
| Quantity | Part | Remarks | Distributor | Distributor Order Number | Price per Item | Sum |
|---|---|---|---|---|---|---|
| 1 | 79L15 | Reichelt | µA 79L15 | 0.16 | 0.16 | |
| 1 | 78L15 | Reichelt | µA 78L15 | 0.14 | 0.14 | |
| 6 | TT Potentiometer 16 mm, 25kΩ lin, solder pads | Tube Town | tpo16-25k-lin | 0.69 | 4.14 | |
| 2 | TL074 | Reichelt | TL 074 DIL | 0.3 | 0.6 | |
| 1 | TL072 | Reichelt | TL 072 DIP | 0.28 | 0.28 | |
| 1 | Styroflex Capacitor, 220pF, 2,5% | Reichelt | STYROFLEX 220P | 0.31 | 0.31 | |
| 2 | 22µF 63V | Reichelt | RAD 105 22/63 | 0.04 | 0.08 | |
| 2 | 5 pin PCB Connector (pin+socket), straight, white, 25cm cable | Reichelt | PS 25/5G WS | 0.45 | 0.9 | |
| 2 | 3 pin PCB Connector (pin+socket), straight, white, 25cm cable | Reichelt | PS 25/3G WS | 0.29 | 0.58 | |
| 5 | 2 pin PCB Connector (pin+socket), straight, white, 25cm cable | Reichelt | PS 25/2G WS | 0.29 | 1.45 | |
| 5 | 100nF MKS-2 5% 63V | Reichelt | MKS-2-5 100N | 0.09 | 0.45 | |
| 2 | 49,9kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 50,0K | 0.04 | 0.08 | |
| 1 | 5,6kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 5,60K | 0.04 | 0.04 | |
| 2 | 470kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 470K | 0.04 | 0.08 | |
| 1 | 47kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 47,0K | 0.04 | 0.04 | |
| 1 | 4,7kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 4,70K | 0.04 | 0.04 | |
| 2 | 33kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 33,0K | 0.04 | 0.08 | |
| 1 | 3,3MΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 3,30M | 0.04 | 0.04 | |
| 1 | 270kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 270K | 0.04 | 0.04 | |
| 2 | 220kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 220k | 0.04 | 0.08 | |
| 2 | 22kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 22,0k | 0.04 | 0.08 | |
| 1 | 200kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 200K | 0.04 | 0.04 | |
| 1 | 180kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 180K | 0.04 | 0.04 | |
| 2 | 150kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 150K | 0.04 | 0.08 | |
| 1 | 15kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 15,0K | 0.04 | 0.04 | |
| 2 | 12kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 12,0K | 0.04 | 0.08 | |
| 14 | 100kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 100K | 0.04 | 0.56 | |
| 6 | 10kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 10,0K | 0.04 | 0.24 | |
| 1 | 10Ω 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 10,0 | 0.04 | 0.04 | |
| 1 | 1,5kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 1,50K | 0.04 | 0.04 | |
| 4 | 1kΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 1,00K | 0.04 | 0.16 | |
| 1 | LM311N | Reichelt | LM 311 DIP | 0.22 | 0.22 | |
| 3 | Ceramic Disc Capacitor, 500V, 47pf | Reichelt | KERKO-500 47P | 0.07 | 0.21 | |
| 1 | Ceramic Disc Capacitor, 500V, 10pf | Reichelt | KERKO-500 10P | 0.07 | 0.07 | |
| 1 | Ceramic Disc Capacitor, 500V, 100pf | Reichelt | KERKO-500 100P | 0.04 | 0.04 | |
| 1 | J112 | Musikding | J112 | 0.25 | 0.25 | |
| 1 | IC-Socket, 8 pin, low profile, twisted, gilded | Reichelt | GS 8P | 0.19 | 0.19 | |
| 2 | IC-Socket, 14 pin, low profile, twisted, gilded | Reichelt | GS 14P | 0.26 | 0.52 | |
| 10 | Jack plug, 6.3 mm mono, central fixing, with switch, solder pads | Reichelt | EBMS 63 | 0.22 | 2.2 | |
| 1 | Photo-coated board, Bungard 75x100mm, single-sided 35µm, 1,5mm width | Reichelt | BEL 75X100-1 | 0.96 | 0.96 | |
| 2 | BC547B Transistor NPN TO-92 45V 0,1A 0,5W | Reichelt | BC 547B | 0.04 | 0.08 | |
| 1 | Precision Potentiometer, 25 Turns, vertical, 50kΩ, Type 64W | Reichelt | 64W-50K | 0.3 | 0.3 | |
| 1 | Precision Potentiometer, 25 Turns, vertical, 20kΩ, Type 64W | Reichelt | 64W-20K | 0.3 | 0.3 | |
| 1 | Precision Potentiometer, 25 Turns, vertical, 200kΩ, Type 64W | Reichelt | 64W-200K | 0.3 | 0.3 | |
| 1 | Precision Potentiometer, 25 Turns, vertical, 10kΩ, Type 64W | Reichelt | 64W-10K | 0.3 | 0.3 | |
| 6 | 1N4148 Planar Epitaxial Switching Diode, DO35, 100V, 0,15A | Reichelt | 1N 4148 | 0.02 | 0.12 | |
| 1 | LT300014T261K0J | HBE | 1174306 | 0.32 | 0.32 | |
| 3 | 1MΩ 1% tolerance, ¼Watts, Metal Film | Reichelt | METALL 1,00M | 0.04 | 0.12 | |
| 6 | Potentiometer Knob REAN P670 series | - | - | 0.20 | 1.20 | |
| 1 | Wooden Panel, 2mm thick | - | - | 1 | 1 | |
| 1 | One sheet of Zweckform 3487 | - | - | about 0,50 | 0,50 | |
| SUM | 20.16 |
Not included in the list are common things like cables, screws, nuts etc.
All prices in EUR.