Quad-AMBE3000
About the Quad-AMBE3000 PCB
Quad-AMBE3000 is an open source PCB design by m1geo, published on GitHub under the MIT license. It is a 4-layer board measuring 84 × 62 mm, with 192 components from 30 distinct parts.
Other key parts include the 74AVC9112DCH, 74HC595D, AT93C46D-TH-T, FT4232HL and TPS7A8001DRBR. By type, the board carries 108 capacitors, 49 resistors, 10 ICs, 9 diodes, 5 transistors and 4 jumpers.
It belongs with the audio designs in this gallery.
From the project
A PCB for four DVSI AMBE-3000R Vocoders for use with WebSDRs/Audio transcoding
Using four AMBE-3000R parts was cheaper than using a single AMBE-3003, which was the original plan. This is useful for VHF, UHF, SHF WebSDR platforms that decode D-Star, DMR, YSF, NXDN, P25, etc. A soft-codec approach based on mbelib can be used, but appeared to give poorer decode audio when tested.
Using four AMBE-3003 parts gives a total of 12 similtaneous transcode streams. the '3003 part requires 1V9 instead of 1V8. You may also benefit from increasing the SCOMRATE to 921,600kbps, by changing SCOMRATE0 from low to high. See the devices respective datasheets.
Main components on the Quad-AMBE3000
Quad-AMBE3000 bill of materials (BOM)
192 components, 30 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74AVC9112DCH | VSSOP-8_2.4x2.1mm_P0.5mm | U1 |
| 1 | 74HC595D | SO-16_3.9x9.9mm_P1.27mm | U2 |
| 1 | AT93C46D-TH-T | TSSOP-8_4.4x3mm_P0.65mm | U3 |
| 1 | FT4232HL | LQFP-64_10x10mm_P0.5mm | U4 |
| 2 | TPS7A8001DRBR | Texas_DRB0008A | U5, U6 |
| 4 | AMBE-3000R | LQFP-128_14x14mm_P0.4mm | U7, U8, U9, U10 |
| 5 | AO3400A | SOT-23 | Q1, Q2, Q3, Q4, Q5 |
| 1 | 29.4912MHz | Oscillator_SMD_Abracon_ASV-4Pin_7.0x5.1mm | X1 |
| 1 | 12M | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | USB_C | USB_C_Receptacle_GCT_USB4110 | J1 |
| 4 | HW RST | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4 |
| 4 | GRN | LED_0603_1608Metric | D1, D3, D5, D7 |
| 4 | RED | LED_0603_1608Metric | D2, D4, D6, D8 |
| 1 | WHT | LED_0603_1608Metric | D9 |
| 4 | 600R/100M | L_0805_2012Metric | FB1, FB2, FB3, FB4 |
| 82 | 100n | C_0603_1608Metric | C1, C2, C3, C4, C5, C7, C9, C11 +74 |
| 10 | 4u7 | C_0603_1608Metric | C6, C8, C15, C21, C22, C25, C27, C28 +2 |
| 2 | 30p | C_0603_1608Metric | C10, C13 |
| 2 | 10n | C_0603_1608Metric | C23, C30 |
| 12 | 10u | C_0603_1608Metric | C33, C34, C37, C54, C55, C58, C75, C76 +4 |
Show 10 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 5 | 33R | R_0603_1608Metric | R1, R2, R3, R4, R5 |
| 17 | 10k | R_0603_1608Metric | R6, R17, R18, R20, R25, R29, R30, R31 +9 |
| 2 | 5k1 | R_0603_1608Metric | R7, R8 |
| 9 | 330R | R_0603_1608Metric | R9, R10, R11, R12, R13, R14, R15, R16 +1 |
| 2 | 1k | R_0603_1608Metric | R19, R21 |
| 2 | 12k | R_0603_1608Metric | R22, R28 |
| 3 | 30k9 | R_0603_1608Metric | R23, R24, R26 |
| 1 | 15k | R_0603_1608Metric | R27 |
| 4 | 24k9 | R_0603_1608Metric | R32, R37, R42, R47 |
| 4 | 5R1 | R_0603_1608Metric | R33, R38, R43, R48 |
Quad-AMBE3000 design files
The KiCad project lives in the m1geo/Quad-AMBE3000 repository on GitHub; these links point at the commit this page was built from.
- LayoutQuad-AMBE3000.kicad_pcb
- SchematicQuad-AMBE3000.kicad_sch
Quad-AMBE3000: common questions
How big is the Quad-AMBE3000 PCB?
The Quad-AMBE3000 measures 84 × 62 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Quad-AMBE3000?
192 components, from 30 distinct parts. The full bill of materials is listed on this page.
Where can I download the Quad-AMBE3000 design files?
From the m1geo/Quad-AMBE3000 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Quad-AMBE3000 design in my own project?
Yes, under the terms of its MIT license, which m1geo chose for the repository.
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