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Headphone Adaptor - A simple adaptor to provide a headphone output to an existing power amplifier __ Designed by Rod Elliott ESP
HeadBanger Headphone Amp Construction Kit - After the euphoria over receiving my new Sony Minidisc bundle had partially subsided, I noticed that the portable unit, the MZ-E40, has a rather weak output. Measurements showed that it can only manage 80mV rms output and only about 74dB SPL output from the phones. This is when recording at average level with 8dB of headroom. In contrast __ Designed by Stephen H. Lafferty
Headphone Amplifier - In the fall of 2001, I have built one of the Stor designs: a single-ended class A headphone amplifier with only three transistors per channel: one BC109 (voltage amplifier with local negative feedback) and two 2N3055s (modulated current source). At first, I thought that this circuit could hardly sound good. However, simulations indicated low THD. Moreover, the harmonic spectrum was nice: mainly second and relatively few and weak higher-order components. A tube-like spectrum, in my opinion a good thing ! This encouraged me to give the circuit a try __ Designed by Aren van Waarde
Hi-Fi Headphone Amp - The intention is to permanently insert the headphone amp between pre and power amps, although it can be used as a stand-alone item. The input relay is operated by auxiliary contacts on the headphone sockets through a transistor driver (with a small delay) so as to mute the power amp input when listening on headphones __ Designed by Rod Elliott ESP
Hi-Fi Headphone Amplifier The intention is to permanently insert the headphone amp between pre and power amps, although it can be used as a stand-alone item. The input relay is operated by auxiliary contacts on the headphone sockets through a transistor driver (with a small delay) so as to mute the power amp input when listening on headphones. __ Designed by Richard Crowley
Hi-Fi Headphone Amplifier - Can be directly connected to CD players, tuners and tape recorders. * Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohm. * Old 8 Ohm impedance headphones can be also driven, but these obsolete devices are not recommended. * Schematic shows left channel and power supply (common to both channels). * Numbers in parentheses show IC1 right channel pin connections. * A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 & C4. Then connect separately the input and output grounds to the power supply ground. __ Designed by Richard Crowley
Headphone driving for soundcards - Computer soundcards typically have line level and speaker level outputs. Neither of those is usually nott very suitable for driving headphones: If you connect the headphones to the line level output you will usally loose tha bass frequencies because of small coupling capacitors. Line output circuitry might be overloaded because of too low input impedance and this can cause distortion __ Designed by Tomi Engdahl
Headphone Amplifier - Can be directly connected to CD players, tuners and tape recorders. __ Contact: Flavio Dellepiane, fladello @ tin.it
Headphone Amplifier - An amplifier to drive low to medium impedance headphones built using discrete components __ Designed by Andy Collison
High quality AM through your FM stereo - amateur radio construction projects. __ Designed by Peter Parker
High-Performance Stereo Headphone Amplifier, Pt.1 - If you can't afford a high-performance amplifier and loudspeakers, you can still have the best possible hifi sound, with this headphone amplifier and a set of high-quality headphones. __ SiliconChip
High-Performance Stereo Headphone Amplifier, Pt.2 - Last month we introduced our new Hifi Headphone Amplifier which features very low distortion and noise. It can even drive efficient 8-ohm speakers. This month, we show you how to build and test it. __ SiliconChip
High-quality Stereo Encoder - This stereo encoder is a halfway between analogue and digital processing. It combines the best from both domains to provide high-quality and easy to build device. The sampling frequency used in this stereo encoder is 97 times __ Jan Kolar
I.R. Headphone SystE - M - The 555 forms on oscillator generating pulses at a frequency of about 100kHz. Pin 5 on the 555 is the "control voltage" pin. A voltage applied to this pin will vary the frequency of the oscillations. If the input is an audio frequency alternating voltage, it will modulate the frequency of the oscillator. We therefore have a frequency modulated (f. m.) infra-red beam. __ Designed by © David Hoult
Improved FM Stereo Modulator - This circuitry is used for generating a high quality FM stereo multiplex signal that is suitable for driving mono FM transmitters. The Rev E2 FM stereo multiplex generator is the most recent design in a series of circuits that have appeared on this site. This version features improvements to the audio mixer stage, better gain adjustments in the audio filter stage and a rework of the multiplexer stage. When it is adjusted properly, the Rev E2 design produces an FM stereo signal with excellent fidelity. __ Designed by Forrest Cook
Infrared Audio Headphone Link for TV - Do you have trouble understanding what's being said on the TV? Do you need the volume cranked up too loud for everyone else? Do you have a hearing aid as well? If you said yes to any other these questions, here is your answer: an infrared transmitter and receiver to let you listen to the TV sound via headphones. That way, you can listen as loudly as you like, without disturbing anyone else. __ SiliconChip
Ipod Stereo FM transmitter with 1W output power - This project explain how you can build and connect a powerful 1W amplifier to your FM transmitters [Contact: info @ rfcandy.biz]
Jericho Horns - The design of this horn loudspeaker was published in the German DIY magazine Klang & Ton 1. Each horn contains one Fostex FE 208 Sigma loudspeaker unit. Efficiency of the horn is 100 dB (1W, 1m), impedance 8 Ohms, and the frequency response is 47 Hz...18 kHz within 3 dB (with correction filter, see the article in Klang & Ton). __ Designed by Aren van Waarde
Low-Cost Quadraphonic Amplifier - Here is a circuit for a simple but useful low-cost quadraphonic (having four channels) amplifier. It can be used for experiments in open or closed spaces, including small home labs and __ Electronics Projects for You
La Petite Audiophile - Little should be said about the third set of speakers in our home. Everything that could be said has already been told on other sites, and in the audio press __ Designed by Aren van Waarde
Mobile Car Stereo Player - Using a mobile phone while driving is dangerous. It is also against the law. However, you can use your mobile phone as a powerful music player with the help of a __ Electronics Projects for You
MP-3 Stereo Transmitter with USB control from a PC - This low cost MP-3 player was designed to be run from a PC via a USB interface. The MP-3 audio from a PC sound card is transmitted to a home stereo via a synthesized FM Transmitter. Also included is a 433 MHz wireless remote control to provide basic VCR type functionality to the whole design. __ Designed by Steve Hageman
Multimedia Speaker - The Dutch magazine Audio & Techniek once published an article about one-way loudspeakers that were based on Audax units 1. Although speakers using just a single full-range unit per audio channel were disregarded in audiophile circles (high intermodulation distortion), they could also have important advantages (excellent imaging). The editors of Audio & Techniek were enthusiastic about the Audax sound; they claimed that the single driver flaws were minor and the advantages were huge. “We never heard so much soundstage for so little money” was their comment. __ Designed by Aren van Waarde
NTE789 Stereo Decoder - The NTE789, a monolithic silicon integrated circuit, is a stereo multiplex decoder intended for FM multiplex systems. This stereo multiplex decoder requires only one low–inductance tuning coil (requires only one adjustment for complete alignment) , provides automatic stereo switching, energizes a stereo indicator lamp, and operates from a wide range of voltage supplies.
Optp Stereo Link - Circuit Diagram Only __ Contact: info @ forsselltech . com
Output Combiner-2 Line - 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. Some people have suggested of combining two audio outputs with an "Y-adapter" which is ment to split one output. Those adapters are just one male connector and two feamle connector directly wired to each other in the followin way: __ Designed by Tomi Engdahl |
