§ 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.
C1—C2: .1 uF ceramic capacitor
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
C5—C6: 2.2 uF ceramic or other non-polarized capacitor (see frequency response calculator)
C21—C22: 10 uF ceramic or other non-polarized capacitor
Choose Unity Gain Buffer or Gain Amplifier build, then:
- If buffer: R1—R2: 10 ohms 1/8th watt resistors
If amplifier: R1—R2: Amplifier feedback resistance calculator (use 10000 ohms as the input impedance)
R3—R4: 10 k-ohms 1/8th watt resistors
U1: TLO-72 low-noise op-amp, can substitute TLO-82, or similar. Observe polarity. An IC socket is strongly recommended.
Install 3-pin jumper J1 — use .100 inch (2.54mm) header pins; do not close
Install 2-pin jumper J2 — use .100 inch (2.54mm) header pins; do not close
Install 2-pin jumper J3 — use .100 inch (2.54mm) header pins; do not close
Install 2-pin jumper J4 — use .100 inch (2.54mm) header pins; do not close
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
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.
Lastly, install M3 mounting hardware at all 4 mount points
If you would like to DC
-couple the outputs while retaining the AC
input coupling, place jumper caps across J
3 and J
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