Envelope follower
About the Envelope follower PCB
Envelope follower is an open source PCB design by OSHE-Github, published on GitHub. It is a 4-layer board measuring 67.8 × 82.7 mm, with 93 components from 51 distinct parts.
Other key parts include the AD820ARZ, IRS2153DSPBF, SIR870DP-T1-GE3, OPA454AIDDA and MJE15033G. By type, the board carries 42 ICs, 25 resistors, 11 capacitors, 7 test points, 2 diodes and 1 transistor.
It belongs with the audio designs in this gallery.
From the project
Specifications were defined throughout the process, both to guide the design and to evaluate the actual performance of the completed design. Common amplifier specifications listed on commercial designs include those shown in Table 1, including more which do not apply, are difficu
Specifications were defined throughout the process, both to guide the design and to evaluate the actual performance of the completed design. Common amplifier specifications listed on commercial designs include those shown in Table 1, including more which do not apply, are difficult to set a target for, or are not easily testable. Target values were defined based on typical values and on what was a reasonable goal for this project. The specifications and their values are listed in the table below.
Main components on the Envelope follower
Envelope follower bill of materials (BOM)
93 components, 51 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AD820ARZ ETQ-P6M3R3YLC | INDUCTOR FOOTPRINT 10.9*10 | U1 |
| 1 | IRS2153DSPBF LM51561DSSR | WSON-12_L3.0-W2.0-P0.5-BL-EP2.7 | U2 |
| 2 | SIR870DP-T1-GE3 1uf | C1206 | U3, U4 |
| 1 | OPA454AIDDA ETQ-P6M3R3YLC | INDUCTOR FOOTPRINT 10.9*10 | U5 |
| 2 | MJE15033G 1uf | C1206 | U6, U9 |
| 1 | MJE15032G 44.2K | R0402 | U8 |
| 28 | 1uf | C1206 | U10, U11, U13, U14, U15, U16, U22, U23 +20 |
| 1 | S-1212BC0-M5T1U | SOT-23-5_L2.9-W1.6-P0.95-LS2.8-TL | U12 |
| 1 | OPA4197IPWR | TSSOP-14_L5.0-W4.4-P0.65-LS6.4-BL | U17 |
| 2 | XT-30 | XT-30 | U18, U19 |
| 1 | 10mΩ | R2512 | U21 |
| 1 | OPA197IDR | SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL | U44 |
| 1 | SIR870DP-T1-GE3 | POWERPAK-SO-8_L5.9-W4.9-P1.27-BL-EP | Q1 |
| 1 | SJ1-3523N | AUDIO-TH_SJ1-3523N | CN1 |
| 1 | Rail splitter PWR | HDR-M-2.54_1X2 | 12V |
| 1 | Hole_gge10732 | Hole_gge10732 | Hole_gge10732 |
| 1 | Hole_gge10771 | Hole_gge10771 | Hole_gge10771 |
| 1 | Hole_gge10801 | Hole_gge10801 | Hole_gge10801 |
| 7 | Keystone_TP_5000 | KEYSTONE_TP_5000 | TP1, TP2, TP3, TP4, TP5, TP6, TP7 |
| 1 | SD103AW-7-F | SOD-123_L2.8-W1.8-LS3.7-RD | D1 |
Show 31 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | FSV20120V | FSV20120V | D2 |
| 1 | 2.2N 10uF | C1206 | C1 |
| 1 | 2.2N 100nF | C0603 | C2 |
| 1 | 10U 100nF | C0603 | C3 |
| 1 | 0.1U 10uF | C1206 | C6 |
| 1 | 10uF | C1206 | C7 |
| 4 | 330uF | CAP-TH_BD12.5-P5.00-D0.6-FD | C8, C9, C10, C11 |
| 1 | 220nF | C1206 | C12 |
| 1 | 4.7nF | C0402 | C13 |
| 1 | 33K 10kΩ | RES-ADJ-SMD_3P-L3.0-W3.8-P1.75-BR | R1 |
| 1 | 330 10kΩ | R0402 | R2 |
| 1 | 3.9K 23.7kΩ | R0402 | R3 |
| 1 | 12K 900kΩ | R0603 | R4 |
| 1 | 3.3K 10kΩ | R0603 | R5 |
| 1 | 82K 10kΩ | R0603 | R6 |
| 1 | 4.7K 270kΩ | R0603 | R7 |
| 4 | 10kΩ | R0603 | R9, R10, R16, R17 |
| 1 | 1kΩ | R0603 | R11 |
| 1 | 1.5K 50kΩ | R0603 | R12 |
| 1 | 1.5K 800Ω | R0603 | R13 |
| 1 | 1.5K 100kΩ | RES-ADJ-TH_PDB182-K220K-104B | R14 |
| 1 | 1.5K 10kΩ | R0603 | R15 |
| 1 | 20K 10kΩ | R0603 | R18 |
| 1 | 100 10kΩ | R0603 | R19 |
| 1 | 40K 10kΩ | R0603 | R20 |
| 1 | 40K 2kΩ | R0603 | R21 |
| 1 | 3.6K 800Ω | R0603 | R22 |
| 1 | PV36W102C01B00 100Ω | R0603 | R23 |
| 1 | 1.1K 10Ω | R0603 | R24 |
| 1 | 100 110kΩ | R0603 | R25 |
| 1 | 100 10K_JUMPER | RESISTOR_JUMPER_3 | R26 |
Envelope follower design files
The KiCad project lives in the OSHE-Github/Class-H-Amplifier repository on GitHub; these links point at the commit this page was built from.
Envelope follower: common questions
How big is the Envelope follower PCB?
The Envelope follower measures 67.8 × 82.7 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Envelope follower?
93 components, from 51 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 Envelope follower design files?
From the OSHE-Github/Class-H-Amplifier 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 Envelope follower design in my own project?
The repository has no license, so all rights stay with OSHE-Github. Use it as a reference, and ask the author before reusing the design.
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