Ladderfilter
About the Ladderfilter PCB
Ladderfilter is an open source PCB design by sebastianbeyer, published on GitHub. It is a 2-layer board measuring 98 × 100 mm, with 67 components from 32 distinct parts.
Other key parts include the TL074. By type, the board carries 29 resistors, 12 transistors, 11 capacitors, 6 connectors and 1 IC.
From the project
KOSMO Version of the Kassutronics Transistor Ladderfilter
A Kosmo version of the Kassutronics transistor ladder filter.
Find the documentation and BOM here: (https://github.com/kassu/kassutronics/tree/master/documentation/Transistor%20Ladder%20Filter)
You need to match the transistors, which is a bit boring. Those that I got where already pretty close (within the recommended 2mV limit), but some outliers, so maaaybe you could just try without matching.
Main components on the Ladderfilter
Ladderfilter bill of materials (BOM)
67 components, 32 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TL074 | DIP-14_W7.62mm_Socket_LongPads | U1 |
| 11 | BC547C | TO-92_Inline_Wide | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +3 |
| 1 | BC557C | TO-92_Inline_Wide | Q12 |
| 1 | Eurorack power | Multicomp_MC9A12-1034_2x05_P2.54mm_Vertical | J3 |
| 1 | header main | PinSocket_1x10_P2.54mm_Vertical | J6 |
| 1 | audio in | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J8 |
| 1 | audio out | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J9 |
| 1 | v/oct | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J10 |
| 1 | CV | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J11 |
| 1 | 100k offset trim | Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | drive 10k | Potentiometer_Alps_RK09K_Single_Vertical | RV2 |
| 1 | 10k resonance | Potentiometer_Alps_RK09K_Single_Vertical | RV3 |
| 1 | 10k freq offset | Potentiometer_Bourns_3296W_Vertical | RV4 |
| 1 | 10k frequency | Potentiometer_Alps_RK09K_Single_Vertical | RV5 |
| 1 | 1k v/oct trim | Potentiometer_Bourns_3296W_Vertical | RV6 |
| 1 | 100k cv amt zero trim | Potentiometer_Bourns_3296W_Vertical | RV7 |
| 1 | 100k cv amount | Potentiometer_Alps_RK09K_Single_Vertical | RV8 |
| 4 | 47n | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C1, C2, C3, C4 |
| 1 | 220u | CP_Radial_D5.0mm_P2.00mm | C5 |
| 4 | 10u | CP_Radial_D5.0mm_P2.00mm | C6, C7, C9, C10 |
Show 12 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 100n | C_Disc_D4.7mm_W2.5mm_P5.00mm | C8, C11 |
| 6 | 220 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R1, R2, R3, R4, R5, R6 |
| 3 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R7, R8, R26 |
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R9 |
| 2 | 10R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R10, R11 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R12 |
| 8 | 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R13, R18, R21, R22, R23, R24, R28, R29 |
| 2 | 1.5k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R14, R16 |
| 2 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R15, R20 |
| 2 | 4.7k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R17, R27 |
| 1 | 6.8k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R19 |
| 1 | 1.2k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal_silkvalue | R25 |
Ladderfilter design files
The KiCad project lives in the sebastianbeyer/KOSMO_ladderfilter repository on GitHub; these links point at the commit this page was built from.
Ladderfilter: common questions
How big is the Ladderfilter PCB?
The Ladderfilter measures 98 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Ladderfilter?
67 components, from 32 distinct parts. The full bill of materials is listed on this page.
Where can I download the Ladderfilter design files?
From the sebastianbeyer/KOSMO_ladderfilter repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Ladderfilter design in my own project?
The repository has no license, so all rights stay with sebastianbeyer. Use it as a reference, and ask the author before reusing the design.
