ZK-502L MINI 5.0 Bluetooth-compatible Amplifier Board Wireless Audio Digital
100% brand new and high quality
5.0 Bluetooth-compatible version has high fidelity and two-channel stereo
sound quality, with higher efficiency and farther transmission distance.
Capacitor 470uf 35V solid capacitors ensure power storage and heat
dissipation, and stable power supply is a prerequisite for good sound quality.
The copper DC connector is used to withstand high current and no heat.
Free DC head lead, compatible with the input power interface of this product,
even if you don't have a DC head adapter or battery, it can be easily wired.
It also comes with a volume adjustment function, which rotates the chirp
potentiometer clockwise to zoom in and counterclockwise to decrease.
Great for DIY speakers.
Bluetooth-compatible version: 5.0
Material: Fiber glass board and electronic component
Size: app.55 x 38 x 17mm/2.17x 1.50 x 0.67in
Adaptation supply voltage: 5-24V(optional 9/12/15/18/24V adapter, high power
recommended high voltage)
Adapter speaker: 30-200W, 4Ω，8Ω
Number of channels: Left and right stereo(stereo)
Bluetooth-compatible transmission distance: 15m(without occlusion)
Protection mechanism: Self-recovery overheat protection, self-recovery short
Color: As picture shown
Quantity: 1 Pc
To have enough out put power if the audio input is sufficient and the supply
voltage/current is sufficient. The power supply voltage is higher and the
relative power will be larger. The speakers with different impedances will have
different output power. In the case of sufficient voltage and current, the
larger the ohms of the horn, the smaller the relative sound powre. Please pay
Power supply voltage: 12V--8 ohm speaker/12W(left channel) + 12W(right
channel), 4 ohm speaker/20W + 20W
15V--8 ohms/18 + 18W, 4 ohms/greater than 30 + 30W
19V--8 ohms/32 + 32W, 4 ohms/greater than 45 + 45W
24V--8 ohms/38 + 38W, 4 ohms/greater than 50 + 50W
Precautions for use:
The power switch on the board is the standby switch. After the switch is
turned off, the machine is in a low-power standby state. To completely turn off
the power or unplug the DC plug on the machine for a long time.
Question and answer:
1. How to choose a power supply?
The power supply with the board is critical. The higher the voltage, the
higher the current and the better the output power.
If you only have 12V 1A, you can bring a 3-4 inch speaker.
If you are 19V 5A or above, there is no problem with 8-10 inches, and the
power supply must be highly valued.
If the voltage is too low, the sound will be distorted after the sound is
amplified. If the current is too small, the speaker will pull the voltage low,
work abnormally or the sound quality will deteriorate.
It is recommended to use 18V19V24V power supply with current above 3A. If you
only have 9V12V or 1A 2A power supply, it can also be used but
the power is small. Please pay attention to the maximum volume when using it,
which may affect the sound quality.
2. How to choose a speaker?
Commonly used speakers are generally 8 ohms, can not distinguish between
positive and negative, the effect is the same, 4 ohm speakers can
also be used.
If your speaker power is small, it may be used between 10W-30W. The power
supply voltage is small to prevent the amplifier from burning out
after burning. For example, select a power supply below 15V.
If you are a 50W-200w speaker, don't worry about the speaker burnout. You can
choose 12-24V power supply. The higher the voltage you choose,
the louder the output sound or power.
3. How to connect to Bluetooth?
Power on the power amplifier, connect the speaker, turn the audio knob blue
light to turn on, turn on the phone settings - Bluetooth-compatible - search for
BT-WUZHI", and then click the connection, there will be a beep when the
connection is successful, this When it is in Bluetooth-compatible mode, you can
play music. The next time you power on, it will automatically connect with
4. When the sound becomes louder, the phenomenon of turbid sound appears.
The sound is distorted. Please change the adapter power supply with a higher
5. After the sound becomes louder, the sound is stuck.
The input power is insufficient, and the power supply itself is
intermittently powered off. Please replace the power supply with a larger
the output power is too large, the power amplifier board is seriously heated,
and thermal protection occurs, reducing power usage or enhancing
Please allow 0-1cm error due to manual measurement. pls make sure you do not
mind before you bid.
Due to the difference between different monitors, the picture may not reflect
the actual color of the item. Thank you!
1 x Bluetooth-compatible Amplifier Board
1 x Shell
1 x DC Head Line