L.E. Amplifiers

Link for the Series 2 and Landmark audio amplifier designs

2021-06-17T23:05:00.001+08:00

Hello everyone,

Its been so looooooong that i have not updated this site since the passing of the late Engr Benny Laguisma. When it comes to audio amplifier designs as far as vacuum tubes or valves, BJTs and the use of MOSFETS as well as IGBTs in his designs, he is the right person to go to, bar none.

As an audio hobbyist myself, i am providing here the link to his two designs. One using BJT which is the Series 2 and the other using MOSFETS or IGBT devices which is the Landmark.

This is in homage to a great mentor, teacher, designer, and good chap to have a chat when he was always around. Sir Benny, this is for you.

Click the link below:

Series 2 and Landmark plans

Deni

Roland JC60 with LE Series 2 BJT

2016-01-01T01:39:00.002+08:00

Finally it is done! Had to put a new amp module because i cannot restore fully the original one (no parts available). Module is a Laguisma Series 2 BJT using power transistors with Motorola part numbers 70484140 and 70474140; transistors that are tailored for Peavey equipment.

A clean sounding guitar amp with a light overdrive when engage and great sounding spring reverb.

Engr. Benedicto S. Laguisma

2015-08-10T11:40:00.001+08:00

Series 2 Quasi Version (2N3055) with USB/SD MP3/WMA/FM/Line In Module and IR Remote Capability

2015-04-23T05:15:00.000+08:00

An old high school amplifier project resurrected with a Series 2 Quasi amp module utilizing the same enclosure, power transistors, and power transformer. 30 watts of average RMS power output. :)

LE Series 2 at the Philippine Electronics Forum

2013-05-28T22:39:00.000+08:00

Click here for forum discussions regarding this superb power amplifier. Courtesy of www.elab.ph, broadcast and engineering acoustics section.

:)

New! Download Link for Series 2 Amplifier plans

2012-07-23T20:23:00.001+08:00

Click Here!

L.E. V2 MOSFET Power Amp Modules inside a Peavey XRD680 Powered Mixer

2011-11-29T20:00:00.003+08:00

The modules are powered by +/- 49Vdc

Series 2 Quasi Schematic

2011-06-22T21:42:00.000+08:00

Schematic for this design is here.

Series 2 Quasi Parts Value List

2011-05-11T06:13:00.000+08:00

The parts values for the S2-Quasi is now posted here.

Build it and enjoy!

Series2 and LandMark Plans Download Link

2011-01-31T12:41:00.000+08:00

Hi to everyone.

Here is the direct link for the BJT output Series2 audio amplifier and MOSFET-output quasi LandMark audio amplifier.

Download

Build it and let us know.

LE Amplifier Book

2010-11-22T19:11:00.000+08:00

Hi to everyone.

We would like to inform everyone that the availability of the book entitled "A High Performance Audio Power Amplifier Design and Analysis" is currently unavailable. We are looking ways for a local publisher to do a low volume production to cater to our needs. Given that a substantial request will be for the book, we will let you know.

Thank you for your interest in our designs and we hope to hear from you all successful builders.

Until then, stay tuned.

Series 2 Quasi

2010-11-20T00:54:00.000+08:00

Here is the quasi-version of the Series 2 Audio Power Amplifier design. Its output transistors are both NPN-type. Successful builders commented that its performance with regards to the low frequencies is highly exceptional.

For those who are interested....

2010-10-17T22:51:00.000+08:00

Hello again to everyone.

For those who are interested in building our amp modules, the Series 2 and LandMark designs, are now FREELY available in pdf format. The file contains pcb layout, parts placement guide, schematic and calibration procedure.

To avail, kindly send your email with the following format:

To: leamplifiers@gmail.com
Subject: Series 2 and/or LandMark plans request

and we will reply with the file(s) attached.

Make sure also to include your full name, address, country of origin, e-mail address, and contact number at the end of the e-mail. Rest assured that your personal information will be kept confidential. This is in part of building our correspondence database who actually built the plans, consults, comments, suggests and with your kind permission, post also pictures of the modules you will be sending us.

Thanks in advance and happy DIY'ing!

New Blog Sites for Amp Modules

2010-10-17T22:47:00.000+08:00

Hello to everyone!

All pictures of builders of the different amp designs will be posted on the following blog sites:

Series 2 -> series2.blogspot.com
LandMark -> landmarkseries.blogspot.com
L.E. V Series -> v1v2series.blogspot.com

Previously posted pictures of builders will be move to each respective site.

Thanks and happy DIY'ing!

Valli's LandMark in Progress

2007-07-05T23:44:00.000+08:00

Here are some actual LandMark pictures sent by one of our DIY'ers from UK.

Cheers!

A Testimony on the LandMark

2007-06-26T21:21:00.000+08:00

June 16, 2007

What sweet timing, I just finish the landmark and on the same day you send me , series 2 plans, to drool over.

To say I like the sound of the LANDMARK is an understatement, it's ABSOLUTELY AWESOME !!!

Sweet, subtle yet powerful, the separation, detail of instruments is fantastic. It has rhythm and prat by the bucket loads, the landmark drives my linn isobariks like no other.

Valli, UK

New!!! Another Jeriel Lacar's LandMark (in Stereo)

2007-06-15T21:43:00.000+08:00

Checkout this out....

http://landmarkseries.blogspot.com

Another fine piece of DIY audio amplifier.

For those who have requested...

2007-06-04T23:50:00.000+08:00

For those who have requested (and who will request, too) the Series 2 and LandMark Series plans, our warmest thanks. We hope you are working on our featured designs following carefully the steps and detailed instruction on the files we have sent. We look forward to hear from you.

Landmark Amplifier

2007-05-19T07:54:00.000+08:00

Here is the schematic of our Landmark amplifier module, our first amplifier design using MOSFETs as power output devices.

Landmark Amp Actual Sample Pic

2007-05-09T13:34:00.000+08:00

Here's a closer pic of the Landmark Amp module. For those who are interested with the details of this fine piece of audio amp (schematics, pcb and placement guide, etc), start sending your e-mail to us and we will gladly reply. Our contact e-mail is leamplifiers@gmail.com

Series 2 Amplifier

2007-05-06T10:39:00.000+08:00

Here is the circuit for the BJT-output amplifier module. Several have already been made and have found their applications in the comfort of home audio systems, professional and business establishments, school and public address systems, and students' project of several engineering and tech-voc institutions. The circuit is tried and proven and have gone through the mill for several years.

Audio Amplifer Book

2007-05-06T10:25:00.000+08:00

Here is the book that provides the answer to the searches and challenges of personally designing and assembling your own power amplifier circuit - the very heart of audio power amplifiers.

It is oriented for the audio enthusiasts and hobbyists with an inclination to electronics but may not have a degree in electronics engineering.

The price of the book is PhP 200.00 (shipping and handling not included)

Mark Corpuz' LANDMARK

2007-04-29T16:41:00.000+08:00

February 2006
Supply voltage: +/- 70 volts

TEOFILO “DODONG ” SALAR’S LANDMARK

2007-04-29T16:25:00.000+08:00

January 2005
Supply line: +/- 75 Volts (Bridged for 1000 watts)

LANDMARK MOSFET AMPLIFIER

2007-04-29T15:56:00.000+08:00

Assembled by Jeriel Lacar of VOA, Tarlac BRIDGED for Subwoofer Use