Small Speaker | Electronic Project Circuits

Posts Tagged ‘small speaker’

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

A microphone from the speaker

Operation of the circuit. be When entering the power supply circuit for Q1 will work as an amplifier in common base.That matching the input impedance of the Impact of Impact Speaker impedance low.When signal sound into the speakers.Audio is converted to electrical signals through C2.In addition, C2 to prevent voltage direct current flows into the speaker.The signal goes through C2 drop across R3 is a voltage signal sound.When Q1 work, will result in pressure changes pin B of Q2.This is the amplifier changes, the current implementation of Q2 change.If the speaker signal to drop across R3 is positive.The Q2 will be very current.If the incoming signal is negative, Q2 will be less current.The output is a voltage drop across R4.The C3 protects the DC, not to flow into the.

Be the first to comment - What do you think? Posted by admin - September 18, 2010 at 3:18 am

Categories: Audio diagram, Basic electronics Tags: Microphone preamplifier, microphone with speaker, small speaker

Easy Novel Buzzer

This novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact. As soon as the relay operates the normally closed contact will open, removing power from the relay, the contacts close and the sequence repeats, all very quickly…so fast that the pulse of current causes fluctuations in the transformer primary, and hence secondary. The speakers tone is thus proportional to relay operating frequency. The capacitor C can be used to “tune” the note. The nominal value is 0.001uF, increasing capacitance lowers the buzzers tone.

Source :: http://www.zen22142.zen.co.uk/Circuits/Alarm/buzzer.htm