Generic karaoke amplifier board

amplifier board

Domain: Audio
Ports: 5
Conductors: 10
Source: Estimated

Ports and conductors

Every conductor Zikro reasons about on this device, with the voltage it sits at in normal use and the voltage past which the pin can be damaged. These figures are compared against the other side of a connection, so a wrong row here becomes a wrong verdict.

MIC mic-in

6.35 mm TS jack

Conductor	Contact	Signal class	Direction	Nominal	Abs max	Continuous	Impedance	DC bias
MIC	1	Mic level	Input	10 mV	5 V	unknown	in 2.2 kΩ	Present
GND	2	Mic level	Bidirectional	0 V	unknown	unknown	out 0 Ω	None

AUX L aux-in-left

RCA socket

Conductor	Contact	Signal class	Direction	Nominal	Abs max	Continuous	Impedance	DC bias
AUX L	1	Line level	Input	1 V	unknown	unknown	in 10 kΩ	None
GND	2	Line level	Bidirectional	0 V	unknown	unknown	out 0 Ω	None

AUX R aux-in-right

RCA socket

Conductor	Contact	Signal class	Direction	Nominal	Abs max	Continuous	Impedance	DC bias
AUX R	1	Line level	Input	1 V	unknown	unknown	in 10 kΩ	None
GND	2	Line level	Bidirectional	0 V	unknown	unknown	out 0 Ω	None

SPK speaker-out

2-pole screw terminal

Conductor	Contact	Signal class	Direction	Nominal	Abs max	Continuous	Impedance	DC bias
SPK+	1	Speaker level	Output	10 V	unknown	unknown	out 4 Ω	None
SPK-	2	Speaker level	Output	10 V	unknown	unknown	out 4 Ω	None

DC 12V dc-in

DC barrel socket 5.5 x 2.1 mm

Conductor	Contact	Signal class	Direction	Nominal	Abs max	Continuous	Impedance	DC bias
+12V	1	Power rail	Input	12 V	15 V / 3 A	unknown	unknown	None
GND	2	Power rail	Bidirectional	0 V	unknown	unknown	out 0 Ω	None

Quirks

The things no numeric field carries, and the things that actually break builds.

high-passedmic-in / MIC

Karaoke mic channels are almost always high-passed somewhere between 100 and 150 Hz to keep handling noise down. Anything with real low end, a kick drum especially, will sound thin through it.

dc-biasmic-in / MIC

The mic contact usually sits at a few volts of DC through a bias resistor, to power an electret capsule. Connecting a line output to it couples that DC into the source, so a series blocking capacitor is wanted.

mono-input

One TS jack, one channel. A stereo source needs summing before it gets here; plugging a TRS plug in simply shorts the right channel to ground.

bridged-output

The speaker terminals are usually a bridged pair with neither side at ground. Do not tie SPK- to any other ground in the system.

unverified

This profile describes the class of board rather than one product. Every number here is an informed guess, which is why its confidence is low: check it against your own board before trusting a verdict built on it.

Check this against what you are wiring it to

Put both devices in a project, connect the actual conductors, and read the verdict before you solder anything.

Use in a project

Last reviewed 30 Aug 2026, sourced from estimated.