Benutzer:Felicitus/Modular-Synth/VCO

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This is the VCO module, as per YuSynth VCO Website.

Completed Module
YuSynth VCO Front Panel as Drawing

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

  • All major issues solved. Works like a charm!
  • If the frequency pot is turned to 5 (center), the frequency is already very high. Need to investigate if this is wanted or a "bug".
  • Switching from hard sync to soft sync causes a minor frequency. Not sure why, needs investigation. Maybe fixes itself once a CV voltage is applied

Previous Issues

  • The sine looked very odd. This wasn't actually a bug - T3 wasn't adjusted. I accidently had the scope set to AC coupling, so I actually didn't touch T3.

Experiments

  • Once the heat gun has arrived, test how well the tempco works.


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.