DIY audio amplifiers circuit diagram electronics projects and other related audio projects like : power amplifiers, audio systems, audio filters, vu meters, tone control, audio equalizers and more .
Using integrated circuit U450B manufactured by Telefunken can be made a very simple electronic buzzer siren. The integrated circuit U450B is a sequence of tone generator and can be used in various audio applications.
Because in this electronic buzzer siren circuit are amplified only square waves, maximum power output increase to about 3 W.
When switch S1 pressed, IC1 generates a sequence of three tones, whose frequencies can be changed by adjusting the trim C6.
A simple microphone preamplifier can be designed using SSM2015 chip, manufactured by Precision Monolithics Inc. (PMI), which provides high gain and low noise.
