Commit 0b185703 authored by David Huss's avatar David Huss 💬

Initial commit

parents
# TH-VCO1
(For more Background Details have [a look at the TH-VCO1 Wiki Article](https://code.hfbk.net/t6/sdiy/wikis/th-vco1))
**NB: All rights to the basic schematic design rest with Thomas Henry. We do not claim or grant any copyright or license to this design. His policy is to only distribute printed PCB boards via fonik. He granted us a one time chance to sell our run.**
<img src="Pictures/th-vco-1_1.jpg" height="500px">
The VCO-1 is a triangle core [VCO](https://code.hfbk.net/t6/sdiy/wikis/vco) designed by Thomas Henry. Thomas Henry made the original ±15V available on [birthofasynth.com](http://www.birthofasynth.com/Thomas_Henry/Pages/VCO-1.html). Because Eurorack Modules use a supply voltage of ±12V and the CA3080 OTA is harder to get amd use, [Tom Whitwell](https://github.com/TomWhitwell/TH-VCO1) from [Music Thing Modular](http://musicthing.co.uk/modular/) made an Adaption for Eurorack. This is our fork of Toms design, with improved routing, added a voltage reference and a completely new panel.
In the 2016/2017 Synthesizer Workshop at Computerei we decided to build the TH-VCO1 in Tom Whitwell's adaptation. We needed to order the PCBs ourselves which required a fresh export of Gerbers because our PCB manufacturer had different DRC rules than Toms. However there were a few things that we wanted to change (including the panel layout). One thing lead to another and nearly every bit of Tom's original traces have been rerouted. This had mainly to do with the different requirements we had doing a workshop with students of which some never touched a soldering iron before and others didn't had much to do with synthesizers before. Other changes had been implemented on Toms advice ("add a voltage reference") to make it an even more versatile VCO.
The triangular core of the VCO-1 is a Schmitt Trigger Integrator Circuit. If you're interested read more about it on [birthofasynth.com](http://www.birthofasynth.com/Thomas_Henry/Pages/VCO-1.html) or [here](https://code.hfbk.net/t6/sdiy/th-vco1)
Most of the used components are pretty standard. The only non-standard (harder to get) components are a [2K 3300ppm Tempco](https://www.thonk.co.uk/shop/tempco-resistor-anakeohm-1-3300ppm-x3/) as R2, and a Polystyrene (or Mica) 1nf cap as C3, which should improve frequency stability. If no Polysterene cap is found one could potentially also use a (more expensive) Mica capacitor (German: Glimmerkondensator). You may also use an alternative value of 2.4nF here, to lower the Frequency range.
Look at Toms Quick demo here: https://www.instagram.com/p/_etQT6DmdM/
## Changes
Compared to Tom's Layout many things changed:
- The panel got a complete redesign (making it both fancier and easier to understand).
- Because of the changes in the panel the the Pots PCB had to be rerouted. Nearly everything could be routed on the top layer, leaving a nice undivided groundplane.
- Due to Toms and J3RKs advice [on muffwiggler](https://www.muffwiggler.com/forum/viewtopic.php?p=2401495#2401495), a LM4040-10.0 Reference has been added to stabilize the pitch from voltage fluctuations happening in the potentially rough Eurorack environment. Look at the simulation results [here](Simulations/LTSpice/LM4040_massive_fast_noise.jpg) and [here](Simulations/LTSpice/LM4040_massive_slow_noise.jpg) (both showing a noisy rail on the top plot pane and the resulting buffered voltage after the LM4040 Voltage regulator). This change can be left out by adding jumpers instead of R1, C2 and SHU1 (LM4040)
- This addition made it necessary to reroute the boards
- Two 1x5 Header Pin Strips have been added (to add stability even without adding screws), sadly we ordered the wrong pins ಠ_ಠ
- Most Pads have been swapped for bigger, easier to solder square pads.
- The PWM CV Attenuator Pot now is a 9mm Alpha trimmer (the small ones with the plastic head, commonly used for attenuverters). This however is downwards compatible to the 9mm Alpha pots: if a "normal" 9mm Alpha Pot is desired, it can still be used. You can get these Pots at Thonk if you want them.
- Cleaned up traces and silkscreen where necessary
## Pictures
### PCB Boards
#### Components PCB (Top)
![](DIY_Manuals/Components_Top.png)
#### Components PCB (Bottom)
![](DIY_Manuals/Components_Bottom.png)
#### Pots PCB (Top)
![](DIY_Manuals/Pots_Top.png)
#### Pots PCB (Bottom)
![](DIY_Manuals/Pots_Bottom.png)
### Power Cable
![](DIY_Manuals/Powercable.png)
#### Known Issues with PCB Rev 1.0
- Panel: Circle of Lin FM Attenuator not perfectly centered on hole
- Components: Power Header could get more space
- Components: Trimmers could get more space
- Components: Short circuit between -12 and -10 Volt Trace at U4. Remove Trace between JP1 Pin 8 and U4 Pin 4
- Diameter of Component holes could be bigger for easier soldering
$ 1 0.000005 10.20027730826997 50 5 43
t 416 272 448 272 0 1 0.5438617261040015 0.5754189936250862 100
t 592 256 624 256 0 1 -16.76369570397246 -1.2709775047733078 100
r 464 256 592 256 0 18000
w 464 256 448 256 0
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r 592 256 592 384 0 100000
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O 624 352 688 352 0
w 448 416 592 416 0
w 592 416 592 384 0
o 15 64 0 2083 10 0.003125 0 -1 0
o 16 64 0 2082 20 0.00009765625 1 -1 0
Version 4
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FLAG -1600 -320 0
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IOPIN -1600 -400 Out
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IOPIN -1376 128 In
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IOPIN -1712 -208 Out
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FLAG -1984 -112 VR2
IOPIN -1984 -112 Out
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IOPIN -2352 224 Out
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SYMBOL cap 240 240 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
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SYMATTR Value 1n
SYMATTR SpiceLine Lser=0
SYMBOL res 400 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
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SYMBOL npn 432 64 R0
SYMATTR InstName Q1
SYMATTR Value 2N2222
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SYMATTR InstName Q2
SYMATTR Value 2N2222
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WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
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SYMATTR Value 100k
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WINDOW 3 36 40 Left 2
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WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R5
SYMATTR Value 5.1k
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WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
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SYMATTR Value 20k
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SYMATTR Value 100k
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SYMATTR Value 10k
SYMBOL voltage -880 -176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
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SYMATTR Value 12
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WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
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SYMATTR Value 12
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SYMATTR InstName Q3
SYMATTR Value 2N3906
SYMBOL pnp -240 592 M270
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SYMATTR Value 2N3906
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SYMATTR InstName R10
SYMATTR Value 22k
SYMBOL res -80 672 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
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SYMATTR Value 1m
SYMBOL cap -240 672 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
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SYMATTR Value 1nF
SYMBOL EXTRA\\AudioOpamp\\TI\\TL072 -288 832 M0
SYMATTR InstName U3
SYMBOL diode -432 816 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
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SYMATTR Value 1N4148
SYMBOL res -672 544 R0
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SYMATTR Value {1+RTtotal*tpos}
SYMBOL res -672 624 R0
SYMATTR InstName R13
SYMATTR Value {1+RTtotal*(1-tpos)}
SYMBOL res -672 704 R0
SYMATTR InstName R14
SYMATTR Value R=V(VR2)
SYMBOL res -832 576 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
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SYMATTR Value R=V(VResistance)
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WINDOW 0 32 56 VTop 2
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SYMATTR Value 2k
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SYMBOL res -576 944 R0
SYMATTR InstName R18
SYMATTR Value 50k
SYMBOL res -672 944 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
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SYMATTR Value 2.2m
SYMBOL cap 560 -96 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
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SYMATTR Value 47p
SYMBOL res -1392 656 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R9
SYMATTR Value R=V(VRCoarse)
SYMBOL res -1392 992 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R20
SYMATTR Value R=V(VRFine)
SYMBOL res -1536 656 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
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SYMATTR Value {1+Rtotal*position}
SYMBOL res -1536 736 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R22
SYMATTR Value {1+Rtotal*(1-position)}
SYMBOL res -1536 992 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R23
SYMATTR Value 50k
SYMBOL res -1536 1072 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R24
SYMATTR Value 50k
SYMBOL voltage -1120 -176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
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SYMATTR Value PWL(0 10 500us 10 501us 12 1000us 12)
SYMBOL voltage -1120 -64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
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SYMATTR Value PWL(0 10 500us 10 501us 12 1000us 12)
SYMBOL res -1392 336 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
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SYMATTR Value 100k
SYMBOL res -1392 144 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
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SYMATTR Value R=V(VRCoarse)
SYMBOL res -1456 320 R0
SYMATTR InstName R27
SYMATTR Value 100k
SYMBOL voltage -1600 -416 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V5
SYMATTR Value PWL(1us 0 500us 10 501us 0 1000us 10)
SYMBOL voltage -1712 -192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V6
SYMATTR Value PWL(0 47 500us 47 501us 47 1000us 47)
SYMBOL voltage -1984 -96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V7
SYMATTR Value PWL(0 820 500us 820 501us 820 1000us 820)
SYMBOL voltage -2352 240 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V10
SYMATTR Value PWL(0 100k 500us 100k 501us 100k 1000us 100k)
SYMBOL voltage -2464 368 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V11
SYMATTR Value PWL(0 2M 500us 2M 501us 2.4M 1000us 2.4M)
TEXT -960 264 Left 2 !.tran 1.2ms
TEXT -1848 496 Left 2 !..param Rtotal=100k
TEXT -1856 408 Left 2 ;..step param position 0 1 .1
TEXT -1848 520 Left 2 !..param position=0
TEXT -104 400 Left 2 ;..step param tpos 0 1 .1
TEXT -104 432 Left 2 !..param RTtotal=100
TEXT -104 464 Left 2 !..param tpos=0
TEXT -104 568 Left 2 ;..step param Rpos 0 1 .1
Version 4
SHEET 1 2468 1108
WIRE 2464 -528 1232 -528
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FLAG -384 -112 +12V
IOPIN -384 -112 BiDir
FLAG -272 -112 -12V
IOPIN -272 -112 BiDir
FLAG -160 -112 vOct
IOPIN -160 -112 BiDir
FLAG -160 32 0
FLAG -272 32 0
FLAG -384 32 0
FLAG 208 -80 vOct
IOPIN 208 -80 BiDir
FLAG 720 -128 +12V
IOPIN 720 -128 BiDir
FLAG 720 0 -12V
IOPIN 720 0 BiDir
FLAG 320 224 -12V
IOPIN 320 224 BiDir
FLAG 320 96 +12V
IOPIN 320 96 BiDir
FLAG 320 432 +12V
IOPIN 320 432 BiDir
FLAG 320 544 -12V
IOPIN 320 544 BiDir
FLAG 896 320 0
FLAG 624 80 0
FLAG 960 608 0
FLAG 1072 992 -12V
IOPIN 1072 992 BiDir
FLAG 1072 848 +12V
IOPIN 1072 848 BiDir
FLAG 1008 976 0
FLAG 320 976 0
FLAG 192 752 LinearFM
IOPIN 192 752 In
FLAG 816 720 -12V
IOPIN 816 720 BiDir
FLAG 1376 1088 0
FLAG 1376 -160 +12V
IOPIN 1376 -160 BiDir
FLAG 1376 -16 -12V
IOPIN 1376 -16 BiDir
FLAG 1312 -48 0