Leach Low TIM Power Amplifier Version 4.5

Probably one of the most celebrated power amplifiers in the web, especially to DIY enthusiasts all over the world. This amp has a very colorful history and has been updated several times since it's introduction but still resembles the first version of the amp in many ways. Thanks to it's designer W. Marshall Leach, Jr. for making this excellent amp available to everyone in the planet. You can find detailed plans and other interesting articles at Mr. Leach's website at http://users.ece.gatech.edu/~mleach/lowtim/ .

My finished and working Leach amp...

Output transistors are ON Semiconductor's MJ15024/25 pair...

A Chassis shot showing the whole layout...

The 44V-0-44V/10A power transformer...

The 35A bridge diode, ELNA 10,000uf per rail supply capacitors, bleeder resistors, snubbers and lots of decoupling caps all around. Also included are 3-terminal regulators for opamp circuits...

The input signal-in/overload indicator...

The clipping indicator (behind the trafo)...

The modified thermo fan controller with a scrap heatsink (even the 100K  trimmer labeled 104 was recycled from an old vhs player) :)...

The speaker protector with turn-on delay and dc protection...

The Speak-On connectors (below the thermo fan controller pcb)...

Now isn't that a beauty? Sonics are comparable to hi-end amps considering the use of cheap and readily available parts. Other parts were either bought surplus or recycled parts from former projects :).