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MP3 Player - This is a pocket-sized MP3 player. It has attracting attention as new kind of the portable
audio. I built it let's build a thing in fashion like that. (added 10/05) |
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MP3 Player - This is my MP3/AAC player project. The difference to most other players is that
decoding is not done on a specialized IC (like VS1001), but directly on the microcontroller. It can play MP3 (all bit rates) and AAC (up to ~256 kbps) from SD card in real time. The project is work in progress. (circuit design added 07/07/07) |
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MP3 Player with IR Remote Control - This MP3 player similar to iPOD shuffle that is based on
the latest innovative BU9432 chip from RHOM. It features USB 1.1 / 2.0 Controller, MP3 decoder, system controller for loading MP3 files from a USB flash drive, USB hard drive, USB CD-ROM or USB DVD-ROM drive all in one chip. Once USB flash drive is connected, BU9432
automatically searches for MP3 files for playback. Audio is controlled by tactile buttons; Play, Stop, Previous Song and Next Song. BU9432 can decode VBR MP3, MP2, MP1, Layer 1, 2, 3 files with Sampling rate: 8K - 48KHz and Bit rate: 8Kbps - 448Kbps. It can also recognize
FAT16 and FAT32 USB flash drive / hard drive with capacity from 32MB to 2TBytes. Audio playback is exceptionally good with 93dB signal to noise ratio and 88dB dynamic range. This MP3 player is also controlled by a small IR remote control with the following functions;
Play/Pause, Previous, Next Song, Vol - and Vol +. ….(electronic schematic added 11/08) |
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Multimedia Speaker - …(circuit added 05/08) |
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Multiple Feedback Bandpass Filter - ….(electronic schematic added 06/09) |
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Negative feedback design for amplifiers - how to modify a small class AB amplifier for low
distortion and minimal power drain…(added 07/07/07) |
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No-Compromise OTL Tube Headphone Amplifier - The author achieves his quest for the ultimate
headphone amplifier that offers the best possible sound without any compromises. Based on the same circuit topology as his "Top-Level" amplifiers, this version uses a Raytheon 5842....Designed by Andrea Ciuffoli (circuit design added 01/08) |
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Noise and Operational Amplifier Circuits - AN-358 Analog Devices Application
Notes (app note added 2/06) |
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Non-Complementary Audio Noise Reduction System - National Semiconductor Application Note (app note added 2/06) |
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Nulling of Precision Op Amps - AB-3 Analog Devices Application Notes (app note added 2/06) |
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OA-15: OA-15 Frequent Faux Pas in Applying Wideband Current Feedback Amplifiers - National Semiconductor Application Note
(app note added 2/06) |
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Octave Screamer - Note that the octave module consists of only five parts – input
capacitor, transformer, two germanium diodes, and an output volume pot. The logical extension of this idea would be to add a DPDT switch so the signal could be routed to either the octave circuit or the TS tone controls. Each path ends with a volume control and the switch
....(circuit added 7/02) |
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One Watt 2.3 GHz RF Amplifier using a MRF2001 - (diagram added 6/03) |
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One Watt Class C Amplifier - (electronic circuit added 7/03) |
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Output Current Limiter - ...(spice design added 02/09) |
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Output Current Limiting - ...(spice design added 02/09) |
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Output Stage - ...(spice design added 02/09) |
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Output Transformerless Tube Headphone Amplifier - This OTL mu-follower design uses
paralleled tubes (2 per channel) to minimize noise. It also makes an excellent preamplifier. Designed by Kurt Strain (circuit design added 03/08) |
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Output Voltage Limiter - ...(spice design added 02/09) |
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Output Voltage Limiting - ...(spice design added 02/09) |
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Overture Audio Power Amplifier Series Dual 20-Watt Audio Power Amplifier with Mute and Standby Modes - The
LM1876 is a stereo audio amplifier capable of delivering typically 20W per channel of continuous average output power into a 4 or 8 load with less than 0.1% THD+N.….(added 05/08) |
