4 layers241.2 × 327.2 mm
2 layers61.1 × 52.3 mm
Stack lights
tpcarlson/synth-diy107Mostly Eurorack projects
- Size
- 61.1 × 52.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 50
- Pads
- 116
- Tracks, vias
- 119, 10
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 16 Jan 2021
- Updated
- 19 Sep 2026
Overview
Stack lights is an open-source printed circuit board by tpcarlson, from the tpcarlson/synth-diy repository on GitHub. It is a 2-layer board of 61.1 × 52.3 mm with 33 parts on 50 nets, routed with 119 tracks and 10 vias.
It is built around the L7805, MMBT3904 and MMBT3906, with the 1N5819WS among its other parts. Its parts include 12 resistors, 7 connectors, 6 transistors, 2 capacitors and 1 IC. It belongs with the audio and music boards and the RP2040 boards of this library.
Main components
4
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)MMBT3906
SOT-23-55℃~+150℃ 1 PNP 100 100nA 200mA 200mW 300MHz 300mV 40V 5V PNP SOT-23 Bipolar (BJT) ROHSTWGMCBipolar (BJT)
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky Diodes
README
vcadsr/README.mdVCADSR
What is this?
Voltage controlled ADSR, using the ElectricDruid EnvGen8 chip. The module provides voltage control over most parameters (Attack, decay, sustain, release, time, level) as well as manual control with sliders. There are also three switches for toggling the mode, linear/exponential, and a fifth stage called "punch" which adds a little bit more to the attack on an envelope.
The mode toggle switch allows for gated looping, just looping (Almost like an LFO), and normal ADSR mode.
How much power does it use?
As measured by the joranalogue Test 3, around 40mA on +12v and 30mA on -12v at peak. The 5v rail is unused.
Where does the design come from?
The schematic is really an extension of the reference design on the ElectricDruid site, with some changes to add LEDs, and cutting features that would otherwise take up more panel space than I was comfortable with - I dropped the attenuators for CV inputs in favour of nice big manual controls with linear potentiometers instead.
Are there any rare/weird parts used?
You'll need one of the EnvGen8 chips in order to make this function at all!
Are there any problems with the design?
Just a couple, which are corrected in the version here. First, the LEDs for gate and trigger had some issues drawing too much power due to an oversight in the schematic. As it turns out LEDs don't really like being driven without a resistor! Second, the panel design had the mode and linear/exponential graphics switched which makes operating it a little bit more confusing than it otherwise ought to be.
These problems are both fixed in the repository right now though, however the fixes are untested. If I make another run of these boards, I will verify that the fix worked and remove this whole section!
Do you have a BOM/Mouser cart/Tayda links?
Sorry, no. Things go out of stock so frequently it'd be a lot of work to keep these up to date. Everything in this project is easy to source though, so you should not have any trouble.
Other resources
- Assembly instructions
- Interactive BOM - This includes pre-soldered SMT parts as well as the through-hole parts. To use this, save the 'raw' view to your computer and open it in a web browser
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 10k | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R5, R6, R7, R9, R10, R11 |
| 3 | 300R | Resistor_SMD:R_0805_2012Metric | R4, R8, R12 |
| 3 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J3, J4 |
| 3 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q3, Q5 |
| 3 | MMBT3906 | Package_TO_SOT_SMD:SOT-23 | Q2, Q4, Q6 |
| 3 | TestPoint | TestPoint:TestPoint_Plated_Hole_D2.0mm | TP1, TP2, TP3 |
| 2 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1, J6 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 1N5819WS | Diode_SMD:D_SOD-323 | D2 |
| 1 | 330n | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_Horizontal | J5 |
| 1 | Conn_01x04 | Connector_JST:JST_XH_B4B-XH-AM_1x04_P2.50mm_Vertical | J7 |
| 1 | L7805 | Package_TO_SOT_SMD:SOT-89-3 | U1 |
| 1 | RaspberryPi_Pico_W | Module:RaspberryPi_Pico_Common_THT | A1 |
Questions
How big is the Stack lights PCB?
It measures 61.1 × 52.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Stack lights use?
33 parts, built around the L7805, MMBT3904, MMBT3906 and 1N5819WS. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Stack lights KiCad files?
From the tpcarlson/synth-diy repository on GitHub, at the commit this page was made from: the board is stack-lights/stack-lights.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Stack lights design in my own project?
Its repository states no licence, so its author keeps all rights: ask tpcarlson before reusing the design.
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