100W Guitar Amplifier Mk II This amp is rated at 100W into a 4 Ohms load, as this is typical of a “combo” type amp with two 8 Ohm speakers in parallel. Alternatively, you can run the amp into a “quad” box (4 x 8 Ohm speakers in series parallel and will get about 60 Watts. For the really adventurous, 2 quad boxes and the amp head will provide 100W, but will be much louder than the twin. This is a common combination for guitarists, but it does make it hard for the sound guy to bring everything else up to the same level. [via] Infrared cordless Headphone Amplifier Using this low cost Project one can reproduce AUDIO from TV without disturbing anyone. It does not use any wire between TV and HEADPHONE. In place of pair of wires it uses invisible Infrared light to transmit audio signals from TV to Headphone. Without using any lens a range of up to 6 meters is possible. Range can be extended by using Lenses and Reflectors with IR sensors comprising transmitters and receivers. IR transmitter uses two-stage transistor amplifier to drive two IR leds connected in series. An audio output transformer is used (in reverse) to couple Audio output from TV to the IR transmitter. 20W Audio Amplifier using LM1875 20W Audio Amplifier kit is based on LM1875 IC. * Power supply - 48 VDC * Output - 20 W, 4 Ω * Very low distortion (THD - 0.015%), good channel separation and ripple rejection * IC built-in thermal, short circuit protections * Internal output protection diodes * Terminal pins for connecting input * Power Battery Terminal (PBT) for easy power supply and speaker connection * Power-On LED indicator * Heatsink for IC * Four mounting holes of 3.2 mm each with nut and stud * PCB dimensions 48 mm x 60 mm 20W Bridge Audio Amplifier 20W Bridge Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier, specifically designed for car radio applications etc. Power supply - 18 VDC * Output power - 20 W, 4 Ω * IC built in Thermal Shut-down, Load dump voltage surge protected * Terminal pins for connecting left and right audio signal inputs * Relimate Connector for connecting Potentiometer (POT) for volume adjustment * Power Battery Terminal (PBT) for easy power supply and speaker connection * Power-On LED indicator * Heatsink for IC * Four mounting holes of 3.2 mm each with nut and stud * PCB dimensions 63 mm x 65 mm Minty pre-amp freshens your ears Yet another Altoids tin inspired project. This time the “MintyMic” case includes a powered microphone and preamp with line-level outputs and adjustable gain control. Best of all the whole project comes as a kit, or you can get your own parts and follow the instructions on the site, or it can even be shipped pre-assembled for the lazy maker. Low Cost 2×20 Watt Stereo Amplifier by TDA2005 This circuit is a small stereo amplifier for all suitable applications like amplifying small speakers, boxing, etc. It is also suitable for car use but before, the power supply must be choked with at least 150mH and it must give up to approximately 6 to 7 amps during the upstream performance. Tiny audio amplifier using LM386 The Tiny Audio Amplifier kit is a good choice for battery operation. It is based on LM386 IC. * Power supply - 6 - 12 VDC * Output power - 1 W, 8 Ohm * The quiescent power drain is only 24 mW when operating from 6 VDC * Self-centering output quiescent voltage * Onboard PRESET to adjust volume * Terminal pins for connecting power supply, audio signal and speaker * Power-On LED indicator * ON/OFF PCB mounted slide switch for power supply * Four mounting holes of 3.2 mm each * PCB dimensions 44 mm x 44 mm The Leach amp 200W amplifier This article descripts, how I built amplifier from Mr. Marshall Leach known like “The Leach Amp”. I built amplifier from the original instructions on these pages: http://users.ece.gatech.edu/~mleach/lowtim/. Article about bulding of this amplifier I found later in journal A_Radio Praktická elektronika 11/2002. For many years I looked for construction of HiFi amplifier wit a good parameters, enough power reserve and simple construction. Ultra-Linear 6T9 DIY Tube Amplifier It was always my intention to build two 6T9 vacuum tube amplifiers. For the first one I used a baking pan for the chassis and I was interested to hear just how good these simple single-ended (SE) tube amps could be with just basic components. From the first hour of play I was very impressed with just how musical they are when matched with the right speakers. My second build of this amplifier incorporated a lot of the original parts but this time more attention was paid to the construction and small upgrades to capacitors and the power supply. I also found that the sound could be further improved by converting the kit to operate from Pentode mode to Ultra-Linear (UL) mode. Both amplifiers are Class A. LM3886 Power Amp with DIY Chassis This is a simple chassis using just 4 aluminum panels and 2 heatsinks. Designed around dimensions to tightly pack in a LM3886 chip amp kit. The top and bottom panels sit in ridges cut into the heatsinks with a table saw, and then the front and back panels just bolt into the end fins. Rear panel fixings are held with M3 nut and bolts, and panels that join to the heatsinks are held by M4 bolts tapped directly into the heatsinks so no additional brackets are required. Heatsinks are 75 x 160 x 50mm with a 10mm thick base. |
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