RingBuu DC 5V-12V Micro Electret Amplifier MIC Condenser Mini Microphone Amplifier Board Review

Instructions:
1. Amplifier board IN and GND use shielded cable access electret microphone, access to the attention of the polarity, the electret after the reverse will be very little or no sound;
2. Amplifier OUT board connected speakers, speakers away from the microphone, in order to avoid self-excited noise;
3. Power amplifier board positive and negative access 5 ~ 12V DC power supply, please do not reverse, otherwise it will burn out the module;
4. Amplifier board comes with a volume trimmer potentiometer, if you feel the sound is too large or too small can try to adjust.

Precautions:
1. Soldering must be grounded when the soldering iron;
2. Do not reverse the polarity of the input power supply;
3. Output speakers away from the microphone;
4. Try to use the battery power, if you use the adapter, it is best in the power supply in parallel with the appropriate capacity of the capacitor in order to eliminate the introduction of power interference. Mituto input to make use of shielded wire, can effectively reduce the interference signal.

Specifications:
Operating current: 1mA (static) ~ 150mA (max)
Output speaker impedance: 4 Ω-32 Ω(impedance high-sound, high efficiency)
Support the speaker power: 0.5W-25W (In fact, any power speaker can be used, the volume and the speaker power is not much relationship, as long as greater than the power amplifier output rating on the line)
Output power: 750mW (max)
Used for microphone preamplifier effect good, noise and AC ripple is very low, the output signal voltage greater than 1V or more, to promote the power amplifier signal strength.
Size: 2.3×1.4cm/0.91×0.55″
Quantity: 1 Pc

Package Includes:
1 x Ultra-miniature Electret Microphone Amplifier Board