27MHz toy car Transmitter - schematic only, L1=same as L4, L2=15 turns, .5mm wire, 5mm diameter, L3=3.5 turns, .5mm wire, 5mm diameter] __ Designed by Peter Jakab
2x30W (stereo) Amplifier with STK465 - A amplifier of acoustic frequencies can be manufactured with discernible materials, despite is known so much the difficulties of finding of materials, what the problem of regulations. These difficulties are overcome relatively easily if we find amplifier in form completed __ Contact: IQ Technologies
4 Channel Stereo Audio 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
80 Watt FM stereo transmitter - A high quality broadcast transmitter big enough for a medium town! __ Designed by Manfred Mornhinweg
8W PLL Stereo Transmitter with LCD - Very stable FM transmitter based on TSA5511 synthesizer. Frequency is performed with three buttons through PIC16F84 microcontroller. Frequency is displayed on 16x1 LCD.
A Simple Circuit FM Stereo Transmitter - (ATTINY12, ATTINY25, ATtiny2313, AT90S2313, AT90S232, or nearly any other CMOS
microntroller-Yes probably even a PIC!) This project appeared in the December, 2007 issue ofInfo Elektronika Magazine __ Designed by © Richard Cappels
A Stereo Audio Compressor - Do you hate the way the sound level on your TV suddenly jumps during the advert breaks? Or do you find that the sound levels vary widely when switching between digital TV stations? Or maybe you have problems listening to CDs or MP3s in your car or against the background din during a party? Are the soft parts too soft and the loud parts too loud? This Stereo Compressor will solve that problem. It reduces the dynamic range of the signal while still maintaining clean sound. The unit is also ideal for use with PA systems. __ SiliconChip
Active 3-Way Crossover for Loud Speaker Systems - Get the very best from your 3-way loudspeaker system with this easy-to-build high-performance design. __ SiliconChip
Add on 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 __ Designed by PRABHASH K.P.
Allpass Network Shifts Signals 90° - 04/27/95 EDN-Design Ideas Unlike lowpass, bandpass, and other magnitude-altering filters, allpass filters can shift the phase of a signal without affecting its amplitude. For a first-order allpass circuit, the transfer function is. __ Circuit Design by Gary Sellani, Maxim Integrated Products, Sunnyvale, CA
Atmega48/88/168 Development Board - This is versatile development board for AVR microcontrollers ATmega48/88/168. It is good for testing and debugging embedded programs. It has many built-in peripheries connected to microcontroller __ Designed by Radio LocMan
Audio Amplifier for Personal Stereo - In the output stages of most broadcast receivers and some amplifiers, there is a limit up to which maximum power can be developed without distortion. In the widely accepted output circuit, __ Electronics Projects for You
Audio Amplifier-22 Watt - The 22 watt amp uses a TDA1554 two channel Audio Amp chip and is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers __ Designed by Aaron Cake
Audio Line Driver - A stereo line driver for feeding long cables or buffering an audio source. __ Designed by Andy Collison
BA1404 HI-FI Stereo FM Transmitter - The above FM transmitter design is a result of many hours of testing and tweaking. The goal was simple; to test many existing BA1404 transmitter designs, compare their performance, identify weaknesses and come up with a new BA1404 transmitter design that improves sound quality, has very good frequency stability, maximizes transmitter's range, and is fairly simple for everyone to build. We are happy to announce that this goal and expectations have been met and even exceeded.
Baxandall Audio Filter - Schematic only __ Designed by va3iul
Bluetooth Headset Hack - DIY streaming stereo project. __ Contact: Jameco Electronics
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 recorder. It can be plugged directly into a computer sound card's aux input. __ Designed by © G. Forrest Cook January 1, 2005
Build a Stereo Headphone Amplifier - It's based on a single IC and can be used with RIAA (turntable) preamp described in our March 2002 issue (or anything else) __ SiliconChip
Building the Ultra-LD 2x100W Stereo Amplifier - Pt.2; Building the preamplifier, RCA input and power amplifier modules, plus all the performance details. __ SiliconChip
Building the Ultra-LD Stero Amplifier: Part Two - It fits nicely inside an ATX computer tower case, complete with a fan-cooled tunnel heatsink plus selector switch and volume control. __ SiliconChip
Delay Unit for Surround Sound - The Mitsubishi M65830 Delay IC has been discontinued (for reasons beyond my comprehension) , and so far a suitable replacement device has not been found. This means (of course) that you will be unable to build this delay circuit. I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located. The project will be updated at that time. In the meantime, just ignore the delay circuit __ Designed by Rod Elliott ESP
CMoy Headphone Amplifier - CMoy is very simple portable headphone amplifier. The amplifier was originally posted by Chu Moy on headwize. com. The best source of information about this amplifier is article How to Build the CMoy Pocket Amplifier. If you use Google, you will find many pages and pictures about CMoy. Few months ago I decided built this amplifier also. In my post you can find my experience with creating this simple but very good amplifier.