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The Leach 200W Amplifier
Posted on Sunday, November 9, 2008   •   Category: Amplifiers

The Leach 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 Praktick√° elektronika 11/2002. For many years I looked for construction of HiFi amplifier wit a good parameters, enough power reserve and simple construction. I built a couple of amplifiers with integrated circuits MBA810, TDA2005, LM3886, but I was disappointed by their output quality and noise. I decide to built a classic construction with discrete components and bipolar transistors. Construction from Mr. Dudek was interesting, but I didn't like used components and complexity. All of my requirements satisfied construction of the Leach Amp. Circuit author publicates in a February 1976 in american journal. From these days circuit was not practically changed. Little changes are descripted on authors page.

     DS1802 Stereo Digital Volume Control
     KT88 Tube Power Amplifier Class A
     HI-FI Valve Amplifier
     700W Leach Amplifier
     200W MOSFET Power Amplifier
     General Purpose 2 Watt Stereo Power Amplifier
     68 Watts LM3886 Power Amplifier
     Class-A Push-Pull Tube Power Amplifier
     200W Leach Amplifier
     High Performance Stereo Audio Amplifier Using LM3886
The Leach 200W Amplifier

 

Build Accurate LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and reset function to make sure the readings are as accurate as possible ... [more]



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