Alinan 4pcs DC 5V-12V Micro Electret Amplifier MIC Condenser Mini Microphone Board Adjustable Gain 750mW LM386 AMP Module

Note: 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(The signal input line should be as short as possible to reduce interference noise). Amplifier board OUT connected to speaker, Note that output speaker away from the microphone, in order to avoid self-excited noise. Power amplifier board connect to 5-12VDC power supply, please Do Not reverse the polarity, otherwise it will burn out the module. Amplifier board comes with a volume trimmer potentiometer, if you feel the sound is too large or too small can try to adjust. 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. For the sound source of the record player, please check the pickup type of the record player by yourself. This module only supports piezoelectric ceramics and electret stylus, and other stylus is not guaranteed to be supported. Connecting must be grounded when the connecting iron.