2 layers50 × 128.5 mm
TCE
octovolt/TCE
The Two Comparator Effect. Originally designed by Rob Schafer, later improved by cyberboy666, and now turned into a Eurorack module by Octovolt.
58 parts1GPL-3.0
2 layers100 × 35 mm
Two comparator effect
cyberboy666/two_comparator_effect15analog video posterisation effect - adapted from a rob schafer design
- Size
- 100 × 35 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 24
- Pads
- 91
- Tracks, vias
- 177, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 10 Jan 2022
- Updated
- 29 Apr 2025
Overview
Two comparator effect is an open-source printed circuit board by cyberboy666, from the cyberboy666/two_comparator_effect repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 100 × 35 mm with 34 parts on 24 nets, routed with 177 tracks and 0 vias.
It is built around the LM317 and LM339. Its parts include 16 resistors, 4 capacitors, 3 connectors, 2 ICs and 1 diode.
Main components
2
LM317
SOT-223-40℃~+85℃@(Ta) 0.003%Vout 1 1.3V~37V 1A 40V 80dB@(120Hz) Adjustable Positive Short Circuit Protection、Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSJSMSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LM339
SOP-140℃~+70℃ 1.1mA 1.5mV 150ns 2.3nA 2V~32V 32V 57nA DTL、TTL、CMOS Four channels Open Collector SOP-14 Comparators ROHSJSMSEMIComparators
README
panel/eurorack_panel/readme.mdtwo_comparator_effect eurorack_panel notes
- the mounting holes fit m3 screws
- the front_panel mounts to pcb with 12mm standoffs
- this circuit is powered by 5v on 2.1_barrel_jack - a vertical jack soldered to bottom of pcb will allow powering from within eurorack case
- this panel is 7HP
- the default potentiometers in underscores BOMs have 12mm shaft lengths - consider replacing these with >17mm shaft length alternatives if you plan to use it with a panel
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 1u | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C2, C3 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R15 |
| 2 | 1k_pot | lib:Potentiometer_Vertical_Large | RV1, RV2 |
| 2 | 3k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R5 |
| 2 | 75 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8, R10 |
| 2 | 910 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R7 |
| 2 | rca | lib:tht_rca_vertical | J1, J2 |
| 1 | 0.1u | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C4 |
| 1 | 1.2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 1.5k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R14 |
| 1 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R16 |
| 1 | 150k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
| 1 | 180 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13 |
| 1 | 1n914 | Diode_THT:D_A-405_P7.62mm_Horizontal | D1 |
| 1 | 2N3904 | Package_TO_SOT_THT:TO-92_HandSolder | Q1 |
| 1 | 47 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12 |
| 1 | 680 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | Barrel_Jack | lib:BarrelJack_Horizontal | J3 |
| 1 | LM317 | Package_TO_SOT_THT:TO-92_HandSolder | U2 |
| 1 | LM339 | Package_DIP:DIP-14_W7.62mm_LongPads | U1 |
| 1 | SW_DPDT_x2 | lib:dpdt_mini_toggle_switch_tayda | SW1 |
The 30 most common of 34 parts.
Questions
How big is the Two comparator effect PCB?
It measures 100 × 35 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Two comparator effect use?
34 parts, built around the LM317 and LM339. 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 Two comparator effect KiCad files?
From the cyberboy666/two_comparator_effect repository on GitHub, at the commit this page was made from: the board is hardware/two_comparator_effect.kicad_pcb and its schematic hardware/two_comparator_effect.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Two comparator effect design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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