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STD Electronic L-R Xover 12db/Octave 5V single supply

Profile:This is a 2-way Linkwitz-Riley electronic crossover, working on 5V single supply, designed to also provide some gain.

License: Public Domain

Project source: Cloned from L-R Xover 12db/Octave 5V - V2

Creation time: 2022-06-18 17:32:47
Update time: 2022-07-04 00:33:19
Description

This is a 2-way Linkwitz-Riley electronic crossover, working on 5V single supply, designed to also provide some gain.

 

The need for this crossover came as I wanted to design a battery powered small Bluetooth speaker boombox.

The boombox has two small drivers, one full range which has good performance up to 4-5Khz, and a tweeter which enhances the higher frequencies. The drivers are powered by a 5V dual pam8406 amplifier, using one channel of the amplifier for each driver.

So I needed a crossover to separate the frequencies for each channel of the amplifer. As everything else works on 5V, I wanted to come up with a 5V design for the crossover as well.

 

The schematic is based on "Elliot Sound Products" project 81, which is a Linkwitz-Riley, 12db/Octave dual supply crossover.

The original scematic was modified to work on single supply. In addition, I chose the mcp602x opamps cause they are audio quality, 5V rail-to-rail opamps.

The first stage was also modified to provide some gain cause the signal level of the bluetooth is relativly low and there is room to add gain, to reach the maximum input sensitivity of the pam8406.

The mcp6021 which was used for the first stage, was also proved practical as it provides the necessary half-supply reference.  

 

With the given values or resistors and capacitors, the first stage provides a gain of 2.5 (about 8db) and the crossover frequency is at 4822Khz.

Design Drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 470u C1 CAP-D8.0×F3.5 1
2 100n C2,C3,C5,C14 CAP_MLCC_RAD-0.2 4
3 3u3 C4 CAP-D5.0×F2.0 1
4 680n C6 CAP-TH_L7.2-W4.5-P5.00-D0.8 1
5 470n C7 CAP-TH_L7.2-W3.5-P5.00-D0.5 1
6 3n3 C8,C9,C10,C11 CAP-TH_L7.2-W2.5-P5.00-D0.6 4
7 2u2 C12,C13 CAP-TH_L10.5-W6.0-P7.50-D0.6 2
8 KF2510-2A CN1 CONN-TH_KF2510-2A 1
9 RCA CC-132 CN2,CN3,CN4 RCA-CC-132 3
10 50k R1,R3 R_AXIAL-0.4 2
11 2k2 R2 R_AXIAL-0.4 1
12 75k R4 R_AXIAL-0.4 1
13 10k R5,R6,R7,R8 R_AXIAL-0.3 4
14 27k R9,R11 R_AXIAL-0.3 2
15 10k - ?? 50k R10 R_AXIAL-0.4 1
16 100R R12,R14 R_AXIAL-0.4 2
17 50k-optional R13 R_AXIAL-0.4 1
18 MCP6021-EP U1 DIP8 1
19 MCP6024-EP U2 DIP14 1

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