<p>The latest upgrade: LM317 low ripple voltage regulator circuit design, preamplifier were used in a fever-class op amp OP275,</p> <p>Power input bridge reactor, can be AC and DC, DC input can be divided into positive and negative, so more convenient to use</p> <p>Dynamic microphone, electret microphone universal, a broader </p> <p>JP1, JP2 Select the type of microphone for setting the pin: JP1, JP2 all the way, jumper plug is the working mode of the electret microphone, jumper cap plug is dynamic microphone mode of operation.</p> <p>Microphone reverberation chip using PT2399, microphone amplification, preamplifier respectively, using a fever class op amp OP275, microphone board two microphone volume can be independently controlled. Dynamic microphone, electret microphone can be universal. Board has MIC-1 volume, MIC-2 volume, reverberation times, reverb, external audio volume adjustment.</p> <p>Working voltage: AC: 6v-17v or DC: 12v-24v</p> <p>Colour:Red</p> <p>Material:plastic</p> <p>Size:100x50mm</p> <p>Package Contents:</p> <p>1 * Audio Amplifier Board</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>