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Amplifier Circuits:  Power Circuits
Power Amplifiers:  #'s - C        D - K        L - P         Q - S        T - Z

Amplifier -- Main Page

Last Updated: November 30, 2017 07:37 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Mammoth I -  Mamont (aka Mammoth, Mamoet, Mammut) power amp was built around Atma-Sphere M-60 design.  Atma-Sphere site had enough info on the amp schematic and after-market mods and tweaks.  Output tubes (8 per channel __ Contact: klausmobile @ yahoo.Com

Marshall 100W Super Lead adapted for use as a distortion stompbox. Schematic & PCB layout. -  The Thunderchief project, released in March 2004, was the first runoffgroove.com circuit that was developed using the tubes-to-FETs process.  Enlightened and inspired by Doug Hammond's excellent Meteor circuit, we used the same approach in an effort to capture some of the legendary magic of the Marshall Super Lead.  The circuit's performance pleased us, but there were issues. __ Contact: holler @ runoffgroove.Com

Marshall 18W adapted for use as a distortion stompbox -  The Marshall 18W adapted for use as a distortion stompbox. __ Contact: holler @ runoffgroove.Com

Matchless DC/30 adapted for use as a distortion stompbox -  Back in the mid-90s, the Matchless DC/30 became one of the first boutique amps to hit the market.  It excelled at clean tones, as well as thick Vox-like overdriven lead sounds.  There is good reason for the similarity in sound to a Vox amp.  The lead channel of the DC/30 appears to be a modified Vox AC30/4.  The AC30/4 amp featured the EF86 pentode preamp tube, just as the Matchless design. __ Contact: holler @ runoffgroove.Com

May Queen -  A stone cold crazy treble-boosted overdrive. __ Contact: holler @ runoffgroove.Com

Medium Power Wideband Amplifier for MMDS Applications 5/30/98  -  App Note  Doc #911 __ California Eastern Laboratories

Melody generator for greeting cards -  his tiny circuit comprising of a single 3 terminal IC UM66 can be built small enough to be placed inside a greeting card and operated off a single 3V flat button cell. 
There is not much to the circuit.  The UM66 is connected to its suppl. __ Designed by Radioland.nt.au

Metronome -  A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps. __ Designed by Andy Collison

Metronome & Pitch Generator -  CMOS IC1 and IC2B quad AND gate form a 2.4576 MHz crystal oscillator plus a 2400 times divider.  IC3A provides further division by 16, delivering a 64 Hz stable frequency square wave.  This frequency is multiplied (by means of Phase Locked Loop IC5, double decade divider IC4 and IC3B 4 bit binary divider) by the number set by three miniature BCD thumbwheel switches SW1, SW2 and SW3: units, tens and hundreds respectively. __ Contact: Flavio Dellepiane, fladello @ tin.it

Micropower 1MHz V/F Converter -  A 0V to 5V input produces a 0MHz to 1MHz output frequency. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

MIDI Controlled Switches -  Drives up to128 individual relays, solenoids, motors, etc.  with a MIDI note-on and note-off messages  

MIDI Controller Foot Pedal -  Here's a simple project that sends continuous or switch controller MIDI messages that correspond to the position of a potentiometer.  Given a few parts and a cannibalized volume or wah-wah pedal, you can build this MIDI controller pedal and have the ultimate source of controller data in the Universe.  This pedal is especially useful in live performance, but it's also great to have around when sequencing.  An added bonus: the MIDI Footpedal sports a panic button that will silence any stuck notes that come your way. __ Designed by Paul Messick

MIDI Drum Machine Analog Input Schematic -  Schematic only __ Designed by Paul Stoffregen

MIDI Drum machine project -  The MIDI Drum Machine began in the Fall of 1991 as a project for a microprocessor system design course, shortly after I wrote PAULMON1, the 8051 monitor/debugger. __ Designed by Paul Stoffregen

MIDI Generator -  Control some MIDI device with ATtiny26.  The code can be convert it for any AVR family microcontroller __ Designed by Vassilis Stergiopoulos

MIDI Keyboard -  Build a PIC based DIY midi keyboard for under $30 and by using free VSTs   (virtual instruments) you get a powerful music creation system

MIDI Pedalboard encoder & background information -  Almost any commercial electronic keyboard today will provide a MIDI output, which is useful for connecting it to other instruments including some pipe organs.  However MIDI pedalboards are much rarer, which among other things makes it difficult to put together a simple home practice facility.  Therefore this article  shows how the appropriate MIDI signals can be generated from the closure or opening of a simple key contact.  Full details are included for a MIDI encoder suitable for a standard 30 or 32 note pedalboard; the encoder uses only a handful of standard integrated circuits, thus removing the need to program microprocessors or read-only memories for which few have the knowledge or facilities. __ Designed by Colin Pykett

MIDI Tester -  Sometimes when experimenting with different soundcards and MIDI interfaces it is useful to see if there is some data going in MIDI interface.  This can be easily tested with this adapter, which converts the midi signals to visible light pulses.  Just the circuit and plug it to the MIDI output of your computer.  When computer sends any midi data out, you see the LED flashing.  I found this tester very useful in testing homebuilt soundcard MIDI interface. __ Designed by Tomi Engdahl

MIDI2cv8 to Drum Tone Board Connections -  Power for the Drum Tone Board can be tapped from the midi2cv8 aux.  power connections using the parts shown to the left.  The nominal "+5" bias line of the Tone Board will be more like 7 or 8 Volts using the values shown and the Tone Board will like this fine (better than 5V, actually). __ Designed by John Simonton

Midibox 64 -  Schematic Only

Mini Metronome -  Linear scale Small size.40 to 208 beats per minute __ Contact: Flavio Dellepiane, fladello @ tin.it

Mini Portable Guitar Amplifier -  Can be fitted into a packet of cigarettes.    Also suitable as Fuzz-box __ Contact: Flavio Dellepiane, fladello @ tin.it

mini Theremin Mk.2; Pt 2 -  Last month, we described the features of our new Theremin and gave the full circuit details.  This month, we show you how to build it and describe the adjustment procedures. __ SiliconChip

Mini Theremin Mk.2; Pt.1 -  Just move your fingers near the antennas of this theremin to create your own electronic music or eerie science fiction sounds.  It's easy to build, easy to set up and easy to play. __ SiliconChip

Miniature Class a Amplifier -  The philosophy behind this minimalist design has been explained by Flavio Dellepiane on his highly interesting site 1.  I have myself written an article about this fleapower amp from Italy in the American magazine AudioXpress 2.    All relevant details __ Designed by Aren van Waarde

Miniature metronome -  Linear scale Small size.40 to 208 beats per minute __ Contact: Flavio Dellepiane, fladello @ tin.it

Mixer & Preamplifier for String Instruments -  Most of the small musical bands have up to four string instruments like guitars and violins.  The signal from the transducers of these instruments should be buffered and sometimes amplified before __ Electronics Projects for You

Mockman 2.0 -  This project has returned from beyond the grave for a tune-up.  Compressed, harsh, and '80s sounding are fitting descriptions of its sonic character.  Yes, it is a niche sound which is quite the opposite of some JFET-based distortions developed by the 'groove, however we feel it is a great time capsule of an era fondly remembered by many.  Whether you are looking for a simple weekend project or willing to play a cover of an '80s hard rock anthem, the Mockman will suit your needs. __ Contact: holler @ runoffgroove.Com

MOS Doubler -  A cleaner sounding version of an octave up, uses CMOS Logic IC.  Much less distortion than full wave rectifier based octave designs.  New design from R.  G. __ Designed by Guitar Effect RC Keen

MOSFET follower Power Amplifier -  Another contributed project that may be of great interest __ Designed by Pavel Macura

MOSFET Power Amp (project 101) -  200W MOSFET Hi-Fi Power amplifier __ Designed by Rod Elliott  ESP

Motorola Hi-Fi power Amp -  This is a very simple, low cost, Hi-Fi quality power amplifier.  You can build it 5 ways, like it's shown in the table (from 20 W to 80 W RMS). 

MP3 Player -  Schematic Only __ Designed by A Garidol

MP3 Player -  These schematics are one of three parts needed to build the entire MP3 player. The other two are the 8051 Development Board and IDE Interface.

MP3 Player (Rev C) -  Student Project Alert: Many students request this schematic. Many student projects have a scope of work where using this design is legitimate, like this student project where they tried to write ATAPI drivers. For student projects which mandate original hardware design work (not just construction or modification of an existing design), using this large and complex design would be very unwise, as it is more sophisticated than a typical student project.

Mr. EQ-a simple, yet potent DIY equalizer -  A simple, yet potent DIY equalizer. __ Contact: holler @ runoffgroove.Com

Multi-Melody Generator with Instrumental Effect -  This melody generator can generate various English and Hindi tunes as also instrumental effects.  Various modes of melodies can be selected through DIP switches.Other advantages are high volume and volume control.IC __ Electronics Projects for You

Music Box -  This circuit produces 10 different tones and by selecting suitable values to change the voltage on pin 5, the result can be quite pleasing.  Note: the two unused outputs of the 4017 produce a tone equal to that produced by the 555 when pin 5 has no external control voltage. __ 555-Timer

Music Box -  This little novelty uses the PIC PWM output to produce an approximation to decaying sine waves, which sound very much better than fixed amplitude square waves, but its still far from precision function generation!! An LDR provides a simple way to detect when the lid of the music box is opened.  Alternatively of course, pin 13 (RB7) can be tied low and a microswitch employed on the power rail. __ Contact: Karen's Microprocessor Projects

Music From Outer Space Web Schematic -  Make your own electronic design online. __ Contact: Jameco Electronics

Music keyboard inductively senses position & velocity -  EDN-Design Ideas 04/25/2014     Technologies to measure key position, pressure, and velocity go back almost a century.  Now, an inductive sensing IC offers another solution __ Circuit Design by Ian Caven

Music player built on microcontroller AT91SAM7S256 with ARM core -  1.  The player allows: playback wav files in stereo format, 22, 500Hz freqfency, and 8 bits of resolution, display the song titles, display time of songs, the possibility of stopping (pause) and switch songs, the possibility of change __ Designed by Szymon Dyja

Music to light Modulator -  The diagram shows how simple the circuit is.  The audio signal is applied across the LED of the opto-TRIAC.  The potentiometer adjusts the input sensitivity while the resistor is used as protection from high signal peaks. 

Musical Horn for ATBs -  If you are both an all-terrain biker and handy with a soldering iron, then we suggest you build this musical horn which, apart from the fact of having a much pleasanter sound than a simple bell, will usually make passers-by turn to you with a broad smile, so surprised will they be to hear these few notes coming from an ATB or mountain-bike.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Musical Instrument (Expandable) Graphic Equaliser -  This equaliser is designed as a preamp suitable for musical instrumentsguitar, bass and keyboard in particular.  Unlike most conventional graphic equalisers, each slider ranges from fully off to fully on, and not the more conventional +/-12dB or so that is normally available. __ Designed by Rod Elliott  ESP

Musical Ladybug -  Our son Henk is fond of small animalsbees, bugs, waterbugs, frogs, hedgehogs, newts, fishes and toads.  They are caught in the gardens and ponds around our house and neatly stored in vessels, jars and containers for careful study.  After a few days of confinement they are returned to their natural environment (and in unhappy cases, caught again within a few days).  So when we decided to give Henk a radio for his sixth birthday, it could not be a dull grey portable from Radio Shack.  For this special occasion we designed the one and only musical ladybug. __ Designed by Aren van Waarde

Musical Light Chaser -  This music-operated lighting effect generator comprises five sets of 60W bulbs that are arranged in zig-zag fashion.  The bulb sets glow one after another depending on the intensity of the audio __ Electronics Projects for You

Musical Water Shower -  Won’t it be nice to have music playing in the background all the while when you take a shower? This simple circuit does the same.  It plays different tunes repeatedly for __ Electronics Projects for You

Musical’ Touch’ Bell -  Here is a musical call bell that can be operated by just bridging the gap between the touch plates with one’s fingertips.  Thus there is no need for a mechanical ‘on’/‘off’ __ Electronics Projects for You

Mute for Big Briar Etherwave® Theremin -  This circuit permits the addition of a "mute" switch to the Etherwave® Theremin, useful for placing the theremin in a silent mode without having to turn it off completely.  There is no "pop" during the mute-unmute transition.  A MUTE STATUS light-emitting diode doubles as a convenient power indicator.  The circuit was constructed on a small circuit board installed inside the theremin.  The MUTE CONTROL switch __ Designed by Arthur Harrison

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Power Amplifiers:  #'s - C        D - K        L - P         Q - S        T - Z

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