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MIDIGEN – A (belated) LEMS postscript

This short article discusses an add-on to the following:

The Brute: A 3-channel Audio Amplifier For Leslie Speaker Emulation.
Treslie: 3-Phase Leslie Speaker System.
LEM: Leslie Emulation Control System using PIC Microcontroller (18F26K20) based on Pequeno board, (Arduino-alike) and 3 DACs.

Shortly after completing LEMS, The Brute and Treslie, (see links above) it became apparent to me, that [...]

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Single-transistor pre-amp for very-low-impedance Guitar Pickups

A number of my posts (see menu at foot of post) have covered the construction and amplification of home-made guitar pickups fabricated from hard-disk magnets. The amplification so far discussed has generally included the use of op-amps – particularly the Texas TL071/072/074 series. With this post I discuss an alternative – a single transistor amplifier, [...]

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Treslie – A 3-phase speaker system for Leslie emulation

This post describes the design and construction of a 3-phase loudspeaker intended for Leslie Speaker emulation. The unit is intended to be driven by a 3-channel audio amplifier The Brute, which in turn is controlled by LEMS, a micro-controller based control system, the construction of which both are described in companion posts.

Final tests on [...]

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LEMS – A Leslie Speaker Emulation System

Updated: 16th July 2011 @ 3:02am
This post describes the design and construction of a Leslie Speaker Emulation System (LEMS) control unit, based around an 18F26K20 PIC Microcontroller. The unit is intended to be used to split an audio signal into 3 phases, amplitude modulate these and feed to a Leslie Speaker Emulation driver unit [...]

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The Brute: A 3-channel Audio Amplifier For Leslie Speaker Emulation

This post describes the design and construction of a 3-channel, 30 watts per channel, audio amplifier. Although my amp incorporates two antique HY60 power modules, construction details are given for construction using the modern TDA2050A, capable of yielding 32 watts. The amplifier is intended to be used as a Leslie Speaker Emulation driver unit, delivering [...]

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3-Channel Radio Microphone Mixer

A while ago I put together a portable 3-channel mixer suitable for using 3 wireless receiver-connected microphones. I had posted photos of the mocked-up unit on my photo gallery for the intended user, then subsequently posted photos taken during development and construction. I also posted photos showing mods to a cheap (illegal in UK) Microphone [...]

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Modular CamCorder Audio Mixer

A set of modules to build a CamCorder Audio Mixer, or other general purpose use.

I have a CamCorder. Not the latest flash-memory whizz-bang, but a venerable, though entirely reliable, Panasonic VDR-M55EB with CD-Ram. It’s great for out and about shooting, reliable and easy to use, and when I needed to rehearse the making of a [...]

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No-Frills 6-Output Stereo Line Distribution Amplifier

This unit makes an ideal companion for the ‘No-Frills 6-Input Stereo Line Mixer‘ presented in an earlier post.
The unit employs the same SOIC Op-amps (TL074 & TL072) and construction methods, and provided two, 3-input channels (left and right) with independant level controls, together with a stereo (dual) master level control.

The spec is similar to [...]

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The MIDI Guitar – 1: Analog scanning of the Guitar Fretboard

For some time now, I have experimented with producing MIDI signals from a Guitar. Yes, I know there exist a choice of existing systems, but they all have both limitations and drawbacks, the worst of which are:

Cost
Limited to certain Guitar Models
Irreversible changes required to fit
Unsatisfactory string-bending capability

My documented antics with guitars have created much [...]

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Who would run a website? Self-serving Server Farms, Stats & a plaudit.

Recent re-vamping of my PC desktop meant I had got rid of most of my easy-lookup logons, including the ones for my website hoster one.com.
Earlier on this year one.com again experienced severe problems with their servers, but instead of ‘fessing up when I complained about the terrible service over a period of weeks, suggested all [...]

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