Pre Amplifier

Simple megaphone by LM380

Megaphone small lightweight portable size, 5-watt sound for your use at any time. Neck pain because it does not require voice than usual.
Operation of the circuit. When you press the switch circuit S1 is working but no sound came out. When the audio signal to MIC1, a condenser microphone.
This allows audio signals are converted to electrical signals sent to the VR1.Adjust the force acting on C1 of the input signal that serves to expand the filter before the IC1 LM380.Amplifier IC, the output will come out of Pin 8 of IC1 through the filter C5. Was used to drive the speakers.In addition, the R1 and R4 to forward shielding.

Be the first to comment - What do you think? Posted by admin - September 28, 2010 at 1:44 am

Categories: Pre Amplifier Tags: condenser mic circuit, LM380, megaphone circuit

Universal mono preamplifier using ic lm741

This circuit is a mono pre amp circuit, which can be used with a variety of inputs.Can be applied for extending the phone and the other with
When AF IN input signal to pin 3 of IC1, and The voltage input to pin 2 of IC1.The IC number LM741 used to amplifier circuit,Output at Pin 6.
And access to the AF OUT to be applied to various tasks.VR1 is adjusted by the strength of the output signal sent to the AF OUT.

If you want to build this circuit. We recommend buying this kit. Easy to and cheap!

Be the first to comment - What do you think? Posted by admin - September 26, 2010 at 11:23 pm

Categories: Pre Amplifier Tags: lm741 circuit, preamp IC, universal preamplifier circuit

simple audio mixer circuit with fet 2n3819

This circuit, a simple mixer circuit.It can mix two signal channels and one channel is output.Using a codec circuit,Convert stereo audio to mono audio time.
It can increase the number of channels too. By adding a VR1, R1 and C1 to the amount needed. Then connected to Buffett a new one.Most importantly is eating circuit current is very low.Can use with 9-volt batteries immediately.
When entering voice signal, one of input 1 and input 2. Audio is via C1 and C2 of each channel,served coupling signals to VR1 and VR2. To adjust the audio to the Fet Q1.Which it serves, including audio. Then expand signal the output pin S through C3 For coupling signal again, before leaving to the output.