DiscoverCircuits.com, has
27,000+ electronic circuits. The
electronic schematics
are
carefully
cross-referenced into 500+ categories. As a
vital resource for engineers,
hobbyists, inventors &
consultants, the site's collection of information
will
help you find quick design ideas to electronic design
problems.
AUDIO AMP + 3KHz FILTER
This circuit is the audio amp section for a complete optical transmitter. The circuit amplifies and filters the voice audio signals from an electret microphone. The circuit is
described in more detail in the receiver section of Dave Johnson's Handbook of Optical Through the
Air Communications.
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students
& inventors:
2 Channel Power Amplifier: 2-Channel Power Amplifier based
on NTE1606. circuit is powered by a12V,10-Amp power supply.
power of output channels is4 W connected to 8-ohm loudspeakers
(added 2/07)
2-Input Mixer: As simple as it gets.
mixer consists of two transistor-based preAmplifiers. first one (designated "Mike in") offers higher gain. it works well with a regular dynamic microphone. second one can be used
to control audio input from a tape recorder/CD player. (added 10/05)
2-Transistor Amplifier: A simple two-stage
Amplifier. Use any general-purpose NPN with high gain. It will drive low impedance headphones directly. A speaker will probably require furr boost. (added 10/05)
2W Amplifier: Amplifier operates in
Class AB mode; single 470R preset resistor controls quiescent current flowing through BD139/140 complimentary output transistors. Adjustment here, is a trade-off between low
distortion and low quiescent current. Typically, under quiescent conditions, standby current may be 15 mA rising to 150 mA with a 50 mV input signal. A simulated frequency response is ...
(added 4/05)
Copyright 2002 - 2008 David A. Johnson & Associates. All Rights Reserved to the contents & graphics of Discovercircuits.com
Linking is welcomed but COPYING any content or graphics to your server is expressly prohibited.