§ 3.4 - AC-coupled Single-channel Stereo Amplifier

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Before you attempt this build, please:

• Read through the numbered build procedure with the idea of performing the listed steps in order
• Examine the PCB layout
• Examine the schematic diagram
• Refer to each of the linked pages in the "See also" list

This will help ensure that you will have the best possible experience, resulting in a build that works the way you expect it to.

This Mixer Block build is an AC-coupled, unity- or higher-gain, 1-channel, stereo, amplifier.

It has two signal inputs, and two amplified outputs of those signals, one on the L output, and one on the R output.

Input impedance of this buffer/amplifier build is 10 k-ohms.

Build Steps:

1. C1—C2: .1 uF ceramic capacitor
2. C3—C4 optional: ceramic capacitors, only needed for op-amps that require compensation;
   TLO-72 and TLO-82 op-amps do not require compensation. Refer to the specific op-amp's datasheet for design values
3. C5—C6: 2.2 uF ceramic or other non-polarized capacitor (see frequency response calculator)
4. C21—C22: 10 uF ceramic or other non-polarized capacitor
5. Choose Unity Gain Buffer or Gain Amplifier build, then:
   1. If buffer: R1—R2: 10 k-ohms 1/8th watt resistors
   2. If amplifier: R1—R2: Amplifier feedback resistance calculator (use 10000 ohms as the input impedance)
6. R3—R4: 10 k-ohms 1/8th watt resistors
7. U1: TLO-72 low-noise op-amp, can substitute TLO-82, or similar. Observe polarity. An IC socket is strongly recommended.
8. Install 3-pin jumper J1 — use .100 inch (2.54mm) header pins; do not close
9. Install 2-pin jumper J2 — use .100 inch (2.54mm) header pins; do not close
10. Install 2-pin jumper J3 — use .100 inch (2.54mm) header pins; do not close
11. Install 2-pin jumper J4 — use .100 inch (2.54mm) header pins; do not close
12. If you will be using a 4-pin input connector, mount it now at the dark blue box near C5 and C6; otherwise, connect the input and signal ground wires now
13. Install connectors, quantity 4, optional: 5.08mm (.200 in) Spacing, 2-pin PCB Mount Screw Terminal Blocks. Or you can just wire the output from the indicated connections.
14. Lastly, install M3 mounting hardware at all 4 mount points

See also:

Recommended Tools Mounting to Wood Surfaces Mixer Block Parts Sources Wiring to Terminal Blocks

 

 

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