LFOs
About the LFOs PCB
LFOs is an open source PCB design by Desval27, published on GitHub under the MIT license. It is a 2-layer board measuring 160 × 100 mm, with 94 components from 57 distinct parts.
Other key parts include the Generic_OpAmp_Single, LM723 and LM324. By type, the board carries 51 resistors, 22 connectors, 6 ICs, 6 diodes, 5 capacitors and 3 transformers.
It belongs with the audio designs in this gallery.
From the project
Knock-off of the Elektor Formant Synthesizer project with the initial goal of being quasi-authentic and secondary goal undecided. Probably tweaks of some kind.
Main components on the LFOs
LFOs bill of materials (BOM)
94 components, 57 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | Generic_OpAmp_Single | DIP-8 | IC1, IC6 |
| 1 | LM723 LM324 | DIP-14 | IC2 |
| 1 | LM723 Generic_OpAmp_Single | DIP-8 | IC3 |
| 2 | LM324 | DIP-14 | IC4, IC5 |
| 1 | CardConnector | CardConnector | J1 |
| 1 | LFO1 RMP | PanelConnector_1x02 | J2 |
| 1 | LFO1 SQR | PanelConnector_1x02 | J3 |
| 1 | LFO1 TRI | PanelConnector_1x02 | J4 |
| 1 | LFO2 RMP | PanelConnector_1x02 | J5 |
| 1 | LFO2 SQR | PanelConnector_1x02 | J6 |
| 1 | LFO2 TRI | PanelConnector_1x02 | J7 |
| 1 | LFO3 SAW | PanelConnector_1x02 | J8 |
| 1 | LFO3 RMP | PanelConnector_1x02 | J9 |
| 1 | LFO3 TRI | PanelConnector_1x02 | J10 |
| 1 | 2K5 100k | Panel_Connector_1x03 | P1 |
| 1 | 2K5 10k | Potentiometer_Trimmer | P2 |
| 1 | 2K5 1k | Potentiometer_Trimmer | P3 |
| 4 | 10k | Potentiometer_Trimmer_PinSwap | P4, P6, P7, P11 |
| 2 | 10k | Potentiometer_Trimmer | P5, P10 |
| 2 | 100k | Panel_Connector_1x03 | P8, P9 |
Show 37 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1k | Potentiometer_Trimmer | P12 |
| 1 | CardBracket | CardBracket | MH1 |
| 3 | 2N3055 BC548C | TO-92 | T1, T2, T3 |
| 2 | 1N4002 DUS | DUS | D1, D3 |
| 1 | 1N4002 LFO1 LED | PanelConnector_1x02 | D2 |
| 1 | LFO3 LED | PanelConnector_1x02 | D4 |
| 1 | DUS | DUS | D5 |
| 1 | LFO1 LED | PanelConnector_1x02 | D6 |
| 3 | 1µ | C_Rect_400_600 | C1, C2, C5 |
| 2 | 100N 100µ | CP_Axial_800 | C3, C4 |
| 2 | 3K9 68k | R_Axial_Horizontal | R1, R2 |
| 3 | 2R7 100k | R_Axial_Horizontal | R3, R4, R6 |
| 1 | 2R7 47k | R_Axial_Horizontal | R5 |
| 7 | 1k | R_Axial_Horizontal | R7, R28, R29, R34, R47, R48, R51 |
| 8 | 100k | R_Axial_Horizontal | R8, R30, R31, R42, R43, R44, R45, R46 |
| 1 | 22K 100k | R_Axial_Horizontal | R9 |
| 1 | 22K 3k9 | R_Axial_Horizontal | R10 |
| 1 | 6K8 470R | R_Axial_Horizontal | R11 |
| 2 | 6K8 1k | R_Axial_Horizontal | R12, R13 |
| 1 | 6K8 22k | R_Axial_Horizontal | R14 |
| 1 | 680R 470R | R_Axial_Horizontal | R15 |
| 1 | 680R 47R | R_Axial_Horizontal | R16 |
| 1 | 2K7 39R | R_Axial_Horizontal | R17 |
| 1 | 8K2 22k | R_Axial_Horizontal | R18 |
| 2 | 2R7 68k | R_Axial_Horizontal | R19, R20 |
| 1 | 2K2 100k | R_Axial_Horizontal | R21 |
| 1 | 2K7 100k | R_Axial_Horizontal | R22 |
| 1 | 15K 47k | R_Axial_Horizontal | R23 |
| 1 | 150R 100k | R_Axial_Horizontal | R24 |
| 2 | 10k | R_Axial_Horizontal | R25, R27 |
| 1 | 4k7 | R_Axial_Horizontal | R26 |
| 2 | 3k9 | R_Axial_Horizontal | R32, R49 |
| 4 | 470R | R_Axial_Horizontal | R33, R35, R39, R50 |
| 1 | 47R | R_Axial_Horizontal | R36 |
| 2 | 68k | R_Axial_Horizontal | R37, R38 |
| 1 | 22k | R_Axial_Horizontal | R40 |
| 1 | 47k | R_Axial_Horizontal | R41 |
LFOs design files
The KiCad project lives in the Desval27/FormantKO repository on GitHub; these links point at the commit this page was built from.
LFOs: common questions
How big is the LFOs PCB?
The LFOs measures 160 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the LFOs?
94 components, from 57 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the LFOs design files?
From the Desval27/FormantKO repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the LFOs design in my own project?
Yes, under the terms of its MIT license, which Desval27 chose for the repository.
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