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Headphone Amplifier: (electronic schematic /
circuit added 2/05) |
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Headphone Amplifier: (schematic
added 10/06) |
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Headphone Monitor Amp: (circuit / schematic added 6/03) |
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HI FI Class D Audio Power Amplifier: The purpose of this site is
to share a pulse-width modulating Class D audio power amplifier design with the world, in order to involve people that have an interest in this kind of technology. This is in effect an "open
source project", i.e. the design is open and free, and those that have the interest and ability, are encouraged to feed back into the project. (added 4/02) |
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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. (diagram added 6/03) |
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Hi-Fi PC Speaker System: Standard LED VU meter, includes simple rectifier
circuit for full wave detection (electronic circuit added 4/05) |
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High-Performance Audio Applications of the LM833: National Semiconductor
Application Note (app note added 2/06) |
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Infrared Head Phones:
Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and headphones. In place of a pair of wires, it uses
invisible infrared light to transmit audio signals from TV to headphones. Without using any lens, a range of up to 6 metres is possible. Range can be extended ..... (added 10/05) |
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Inside Story: Audison LR604XR amplifier Car Audio:
(electronic design added 6/07) |
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Interfacing Analog Audio Bandwidth Signals to the HPC: National
Semiconductor Application Note (app note added 2/06) |
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Interfacing Microphones to Computer Sound Cards:
(electronic schematic / circuit added 4/02) |
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Isolated Telephone Interface: (electronic
design added 6/07) |
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Keys to Longer Life for CMOS: AN-349 Analog Devices Application Notes (app note added 2/06) Here's How CMOS Can be Protected Against Abuse |
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Klauskorrektor I: First phono stage:
(electronic design added 6/07) |
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Klauskorrektor II: (electronic design added
6/07) |
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Large capacitor charge controllers Car Audio:
(electronic design added 6/07) |
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Leach Amp 120 Watt Power Amplifier: Latest update of
the "Low Tim Amplifier", Claimed to be a very good sounding design (added 4/02) |
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Leach Superamp: 270-Watt Double Barreled Amplifier
published in Audio magazine (added 4/02) |
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Line Level Signal to Microphone Input Adapter: Sometimes there
is need to convert line level signals to such signal that it can be connected to microphone input. Because the line level signals are typically in range of 0.5..2V and the microphone signals
are in millivolt range, quite much attenuation is needed to match the signal levels. This means that typically you will need 40-50 dB of attenuation. (added 11/05) |
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LM380 Power Audio Amplifier: National Semiconductor
Application Note 04-Nov-1995 (app note added 4/02) |
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Low Cost Audio VCA has High Performance:
01/19/95 EDN-Design Ideas / (added 3/06) The inherent matching between the two transconductance amplifiers in IC1 (Fig 1) facilitates a voltage-controlled amplifier (VCA) that offers high
performance and low cost. The circuit's maximum input voltage is +20 dBu (dBu=dB referred to 775 mV rms). THD measures less than 0.015%; noise, -70 dBu; and control-voltage feedthrough, -70
dB. The signal path is simple. IC 1A's negative-feedback configuration... |
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Low Cost Intercom using Transistors:
The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 gets converted into an
asymmetrical astable multivib-rator generating ring signals. These ring signals are amplified by transistor T3 to drive the speaker of earpiece. Current consumption.... (added 10/05) |
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Low impedance microphone amplifier: (electronic
schematic / circuit added 2/05) |
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Low Noise Balanced Microphone Preamp: very low noise, close to the
theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks (added 8/03) |
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Low pass filter - Subwoofer: (electronic
schematic / circuit added 2/05) |
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Low Power Audio Amplifier Based on LM386:
(schematic added 9/02) |
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Low Power Op Amp Audio Amp Intercom:
(electronic Circuit added 03/06) |
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LX1725 15W X 2 30W BTL Class-D Audio Amplifier AN-35: Application Note
35 from Microsem (app note added 3/06) |
