Simple Stereo Electret Microphone PreAmplifier:  (circuit / schematic design added 6/06)

Simple Two Line Output Combiner:  Sometimes there is need to combine the output of two line level audio sources to be fed to one input. A standard way in professional audio is to use a mixing desk, but on home audio system you might want to look for a simpler and less expensive alternative.... (added 11/05)

Single Ended Class A2 SV811 10 Stereo Amp:  (circuit / schematic design added 6/06)

Stereo Amplifier  22 Watts :  (electronic Circuit diagram added 03/03)

Stereo Audio Isolator:  This circuit is useful for removing ground loop hum on a remote line level audio signal line. It can be used to to connect a computer sound card to a stereo amplifier's line input. Other uses include tapping into a line level signal for powering a remote amplifier, and removing common mode ground interference on 12 Volt audio equipment such as a car stereo. The circuit can be used in mono applications by simply ignoring the second channel.... (added 6/06)

Stereo Broadcast Limiter:  Circuit for the Ramsey FM10a/FM25 Transmitter (added 6/06)

Stereo Channel Selector:  The add-on circuit presented here is useful for stereo systems. This circuit has provision for connecting stereo outputs from four different sources/channels as inputs and only one of them is selected/connected to the output at any one time.  When power supply is turned ‘on’, channel A (AR and AL) is selected. If no audio is present in channel A,…  (added 10/05)

Stereo Ducker:  (electronic circuit added 7/03)

Stereo Ducker:  (schematic added 10/06)

Stereo Electret Microphone PreAmplifier:  (circuit / schematic design added 6/06)

Stereo FM Transmitter:  AN-543-StereoFMTransmitter-Analog Device Application Notes  (app note added 6/06) 

Stereo Line Driver:  Power Amp Stereo Line Driver (added 6/06)

Stereo PreAmplifier:  Simple circuitry suitable for moving-magnet cartridges. Passive high-frequency equalization. (added 9/04)

Stereo Synthesizer:  different frequency ranges appear at the two outputs, depending on the setting of the controls and create a stereo effect (added 4/02)

Stereo Tube Amplifier:  (circuit / schematic design added 6/06)

Stereo Width Controller:  (electronic circuit added 10/06)

Stereo Width Controllers:  (circuit / schematic design added 6/06)

Stereo-amplifier IC's outputs drive multiple loads:  11/21/05  EDN Design Ideas  /  (added 10/06)  Reference provides constant bias voltage regardless of supply-voltage variations.

The Big-E Stereo Parabolic Microphone:  This device is a stereo amplifier for a high sensitivity stereo parabolic microphone. It can be used for listening to distant sounds. Typical parabolic microphones are monophonic, this unit has a stereo audio path that helps produce more realistic sounding audio. The Big-E can be used with headphones or as an audio source for a stereo tape recorder or a PC sound card. This circuit also works nicely as a remote stereo audio receiver for accompanying a video surveillance system. It is capable of operating on the end of a four wire shielded cable that is more than 100 feet long. For remote operation, a set of inexpensive amplified PC speakers can be connected to the outputs for monitoring the sound....   (added 6/06)

Two Line Output Combiner:  Sometimes there is need to combine the output of two line level audio sources to be fed to one input. A standard way in professional audio is to use a mixing desk, but on home audio system you might want to look for a simpler and less expensive alternative.... (added 11/05)

VU Stereo Meter:  will indicate the volume level of the audio going to your speakers by lighting up LEDs, based on LM3915 IC   (added 6/06)