LM386 | Electronic Project Circuits

Posts Tagged ‘LM386’

Amplifier audio small to use with 9V battery operated

This is an audio amplifier that can be used with a small 9 volt Battery Operated,Current use as little as 5 milliamps.And amplification up to 500 mW.
Which is sufficient to expand the sound from a sound about or the CD Walk Man out to the small speakers clearly.
When entering the power supply 9-volt circuit IC1 number LM386 amplifier IC size is 300-800 mW, Depending on the power supply circuit with,This is from 4-15 volts.

Once entered into the input pin 3,The non inverting pin to amplifier non-return phase.C1 will be served cut out the noise input to ground.And C2 increases the rate of amplifier,C2 is to add more value.But if the C2 Too much distortion (the C2 should not exceed 100uF).The output of IC1 is out of the pin 5 through C4 coupling audio signals to better and DC block and not passed to the speaker.For the audio portion will also be fed back through R2 and C3 to the high frequency response better.

Be the first to comment - What do you think? Posted by admin - September 28, 2010 at 5:17 pm

Categories: Power Amplifier Tags: LM386, Small amplifiers, small speaker

Doorphone Intercom by IC LM386

For the first time, this circuit was designed by two authors, Mr Laurier Gendron of Burnaby in British Columbia, Canada, and myself. Please make sure you visit Laurier’s web site, Handy Dandy Little Circuits. This page is also available in French by clicking on the flag.
In this doorphone circuit,an 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, giving good voltage gain , whilst providing a low impedance input to match the speaker. Self DC bias is used allowing for variations in transistor current gain. An LM386 is used in non-inverting mode as a power amplifier to boost voltage gain and drive the 8 ohm speaker. The 10k potentiometer acts as the volume control, and overall gain may be adjusted using the 5k preset. The double pole double throw switch, reverses the loudspeaker positions, so that one is used to talk and the other to listen. Manually operating the switch (from inside the house) allows two way communication.