 Audio Perimeter Monitor
Used to detect sound in some area. This circuit has only two transistors and several passive components
Laser Communication System
Audio wireless transmitter and receiver. It uses laser beam from laser pointer to transmit audio signal. Not so applicable, but very interesting and easy circuit to build.
Quadraphonic Amplifier
This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself.
Peak Reading Audio Level Meter
This circuit has minimal number of components and it's easy to build. It measures peak level of a sound signal. It uses
Audio Notch Meter
The controls may also be adjusted for use as a band stop (notch) filter or band pass filter.
Audio Line Driver
This preamplifier has a low output impedance, and is designed to drive long cables, allowing you to listen to a remote music source without having to buy expensive screened cables
6 Input Mixer
A simple mixer with 3 line inputs and 3 mic inputs using commonly available parts. The mic inputs are amplified about 100 times or by 40dB, the total gain with the mixer is 46dB.
Class-A-AB Amplifier 100w
A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker
Op-Amp Microphone Preamp
Audio preamplifier designed for dynamic or electret microphones. Uses several components which are easy to find. It has a 23.5k ohm input impedance. It can be used to amplify weak signals other than from microphone.
Headphone Amplifier
An amplifier to drive low to medium impedance headphones built using discrete components
Dynamic Microphone Preamp
A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance
ECM Mic Preamplifier
A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components
15 Watt Amplifier
A 15 watt amplifier made using discrete components. Interesting and not so difficult do build.
22 Watt Audio Amplifier
22 Watt Audio Amplifier with only one chip TDA1554
Speaker Microphone Circuit
This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone.
8 Watt Audio Amp
Here is the schematic for an 8 watt audio amp. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp.
Digital Volume Control
Adjust volume digitaly on your analog devices
2N3055 Power Amplifier 60W
2N3055 Power Audio Amplifier circuit diagram
Mini-box 2W Amplifier
Mini-box 2W Amplifier Designed for self-powered 8, 4 & 2 Ohm loudspeakers. Contains Bass-boost switch.
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