Feature
●Ultra-miniature electret amplifier module, ultra-small size, support 5 ~ 12V DC power supply, input can be directly connected to the electret microphone without any bias circuit, the sound can be fine-tuned on-board trimmer, the output OUT can drive 8-32ohm(0.5 ~ 35W) speakers, the output power of 750mW, very suitable for DIY various vocal amplifier, pickup, amplifiers, cable walkie-talkie and so on.
●Parameter: Operating voltage: 5V-12V DC; Operating current: 1mA (static) -150mA (max); Output power: 750mW, instantaneous value 1.5W(max); Output speaker impedance: 4 Ω-32 Ω(impedance high-sound, high efficiency); PCB size: 22x13x7.4mm/0.87x0.51x0.29inch(LxWxH);
●Input support: electret, microphone, condenser microphone, moving coil microphone, audio signal; Support the speaker power: 0.5W-25W (supported speakers power does not mean that it can emit a loud enough sound, it is generally recommended to add a power amplifier to increase the output power);
●Default gain: 100db, the potentiometer gain is adjustable: 0 to 100db continuously adjustable, modify the ADD gain capacitor gain can be modified from 20db to 200db;
●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.
Description
Instructions and Precautions:
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; (The signal input line should be as short as possible to reduce interference noise);
2. Amplifier board OUT connected to speaker, Note that output speaker away from the microphone, in order to avoid self-excited noise;
3. Power amplifier board connect to 5-12VDC power supply, please Do Not reverse the polarity, 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.
5. 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.
6. 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;
7. Soldering must be grounded when the soldering iron;
Package Included: 2x Mini Electret Microphone Amplifier Board
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