2 layers104 × 158 mm
4 layers11.2 × 25.4 mm
3374-VCO
alanbog/3374-VCO13CEM 3374 Clone PCB
- Size
- 11.2 × 25.4 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 63
- Nets
- 59
- Pads
- 336
- Tracks, vias
- 664, 64
- Pours
- 417
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 10 Mar 2024
- Updated
- 19 Jan 2025
Overview
3374-VCO is an open-source printed circuit board by alanbog, from the alanbog/3374-VCO repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 4-layer board of 11.2 × 25.4 mm with 63 parts on 59 nets, routed with 664 tracks and 64 vias.
It is built around the TL074HID, AP7370-50FDC and TLV9032D, with the TMP6131DECR, DMMT3904W and DMMT3906W among its other parts. Its parts include 27 resistors, 16 capacitors, 11 transistors, 7 ICs and 2 connectors.
Main components
7
TL074HID
SOIC-14-20V~-2.25V、2.25V~20V -40℃~+125℃ 105dB 1mV 1pA 20V/us 250pA 26mA 2uV/℃ 37nV/√Hz@1kHz 4.5V~40V 5.25MHz 940uA Four channels Short-Circuit Protection、EMI filtering/RF suppression SOIC-14 FET Input Amplifiers ROHSTexas InstrumentsFET Input Amplifiers
AP7370-50FDC
UDFN2020-6-40℃~+125℃@(Tj) 1 1.5uA 18V 300mA 450mV@(100mA) 5V Fixed Over Current Protection、Over Temperature Protection、Enable Positive UDFN2020-6 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TLV9032D
SOIC-8-40℃~+125℃ 0.5uV/℃ 1.65V~5.5V 100ns 16uA 1pA 2 300uV 5pA 70dB CMOS ESD protection Push-pull Rail-to-rail input SOIC-8 Comparators ROHSTexas InstrumentsComparators
TMP6131DECR
SON-2(0.6x1)-40℃~+125℃ 0.6mm 10kΩ 1mm 5.5V ±1% SON-2(0.6x1) PTC Thermistors ROHSTexas InstrumentsPTC Thermistors
DMMT3904W
SC-70-6(SOT-363)-65℃~+150℃ 100 2 NPN 200mA 200mV 200mW 300MHz 40V 50nA 6V NPN SC-70-6(SOT-363) Bipolar (BJT) ROHSDiodes IncorporatedBipolar (BJT)DMMT3906W
SOT-363-65℃~+150℃ 100 2 PNP 200mA 200mW 250MHz 400mV 40V 50nA 5V PNP SOT-363 Bipolar (BJT) ROHSDiodes IncorporatedBipolar (BJT)MUN5314DW1
SOT-363-55℃~+150℃ 0.21 1 NPN Pre-Biased, 1 PNP Pre-Biased 1.4V 100mA 100nA 13kΩ 140 187mW 200mV 250mV 50V 700mV NPN+PNP SOT-363 Digital Transistors ROHSonsemiDigital Transistors
README
README.md3374-VCO
This repository contains a circuit designed to be a clone of the CEM 3374 VCO IC used in analog synthesizers from the early 1980s such as:
- Fender Chroma Polaris
- Oberheim Matrix 12
- Oberheim Xpander
- Akai VX600.
It is designed to operate with 12V for Vcc and -5V or -6V for Vee, which is what all of the synthesizers listed above use for supply voltages. The circuit contains two oscillator channels with triangle and sawtooth wave outputs. Triangle wave outputs have an amplitude of 1/3 Vcc, and sawtooth wave outputs have an amplitude of 2/3 Vcc. Synthesizers using the CEM 3374 that generate square/pulse waves do so with external comparator circuits.
Channel A sync is implemented. Channel B sync is not implemented, but this feature was rarely used on the CEM 3374 (None of the synthesizers listed above use it).
A thermistor circuit is used to provede a temperature compensated reference voltage. Typically, this voltage is used as a reference for the DAC that outputs the voltage that controls the frequency of the oscillators.
This was tested on a Chroma Polaris. It should work in all of the other synthesizers listed above, but it hasn't been tested.
For Rev 1, the oscillator circuit was updated to fix an issue with Oberheim Synthesizers being out of tune at lower notes (although this fix hasn't yet been tested on an Oberheim synthesizer).
Parts
63| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 10k | Resistor_SMD:R_0201_0603Metric | R4, R5, R6, R9, R10, R11, R12, R13, R17, R18, R19, R22, R25, R26 |
| 11 | 100n | Capacitor_SMD:C_0201_0603Metric | C1, C2, C3, C5, C6, C8, C9, C11, C12, C15, C16 |
| 6 | DMMT3904W | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q2, Q4, Q7, Q9, Q10, Q11 |
| 4 | 4.99k | Resistor_SMD:R_0201_0603Metric | R7, R8, R14, R16 |
| 4 | 432K | Resistor_SMD:R_0201_0603Metric | R1, R2, R20, R21 |
| 4 | 680p | Capacitor_SMD:C_0201_0603Metric | C4, C7, C10, C14 |
| 4 | DMMT3906W | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q3, Q5, Q6, Q8 |
| 2 | 3.32k | Resistor_SMD:R_0201_0603Metric | R15, R27 |
| 2 | 365 | Resistor_SMD:R_0201_0603Metric | R3, R24 |
| 2 | DG4053E | footprints:QFN_EEN-T1-GE4_VIS | U1, U2 |
| 2 | FLIP PINS | footprints:FLIP-PINS-FLOAT-09 | J1, J2 |
| 2 | TL074H | footprints:SOT23_DYY_TEX-L | U3, U6 |
| 1 | 11.8k | Resistor_SMD:R_0201_0603Metric | R23 |
| 1 | 2.2u | Capacitor_SMD:C_0402_1005Metric | C13 |
| 1 | AP7370-50FDC | Package_DFN_QFN:DFN-6-1EP_2x2mm_P0.65mm_EP1.01x1.7mm | U4 |
| 1 | MUN5314DW1 | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q1 |
| 1 | TLV9032 | Package_SON:WSON-8-1EP_2x2mm_P0.5mm_EP0.9x1.6mm | U5 |
| 1 | TMP6131DECR | footprints:X1SON2_1XP65_TEX-L | U7 |
Questions
How big is the 3374-VCO PCB?
It measures 11.2 × 25.4 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 3374-VCO use?
63 parts, built around the TL074HID, AP7370-50FDC, TLV9032D and TMP6131DECR. 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 3374-VCO KiCad files?
From the alanbog/3374-VCO repository on GitHub, at the commit this page was made from: the board is KiCad Files/3374_VCO.kicad_pcb and its schematic KiCad Files/3374_VCO.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 3374-VCO design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 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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