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Musical Circuits
Musical Circuits:  #'s - C        D -M        N - S        T - Z 

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :
Band Drummerís Microphone Switch - I received an email from guy who plays drums for a small band.  He wanted a simple way to turn on and off his microphone with just a tap of his drum stick onto a small box.  The circuit below performs this task with the aid of a piezo device as a shock sensor and a small dual coil latching relay with two sets of contacts.  The contacts can be wired any number of ways to a microphone circuit . . . Hobby Circuit designed by David A. Johnson P.E.-October, 2011

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

A 2-channel guitar preamplifier -  Each channel has bass, mid and treble controls and there's an optional digital reverberation unit as well.__ SiliconChip

A Direct Injection Box for Musicians -  Don't put up with hum.  This versatile DI box converts an unbalanced input to a balanced output signal and includes a 3-band equaliser.__ SiliconChip

A PIC-Based Musical Tuning Aid -  This compact device will help you tune almost any musical instrument - acoustic or electronic.  It can produce any note on the tempered musical scale    (standard pitch) in any of the eight most commonly used octaves, with an accuracy of better than ?0.08% or 1.3 musical cents.  The selected note is compared with that from the instrument either by ear or visually by using an eight-LED stroboscopic beat indicator.__ SiliconChip

A Simple Circuit Musical Light -  The circuits for musical lights available in the market are highly expensive and based on microcontrollers.  Also, their programming is very difficult.  Here is a simple and cheap circuit for a...__ Electronics Projects for You

A Tremolo Unit for Musicians -  Jazz up your music with this easy to build unit.__ SiliconChip

A440 Synth Tuning Crystal Controlled Oscillator -  A cheap little crystal controlled sine wave reference oscillator unit, for tuning your analogue synth to.   __ Designed by Henry 

Add harmony to your systE - M -  07/20/00 EDN-Design Ideas - Have you ever wished you could distinguish one device's operating state from anor's by sounds y make or that error states would sound harsh while normal operations would sound harmonious? By combining  NCO technique from a previous Design Idea   (Reference 1] __ Circuit Design by Eugene O -- EDN

Add music to your next project -  12/23/99 EDN-Design Ideas - Adding music to your next design is as simple as using one I/O pin to drive the speaker and approximately 150 words of program memory to play the music.  You can store the musical notes and durations internally in program memory or externally in a serial EEPROM.  Frequently, implementing musical playback requires an external processor with memory or a specialized __ Circuit Design by Rodger Richey, Microchip Technology Inc, Chandler, AZ

Amp based on a Silvertone Twin Twelve -  ampbased upon an old Silvertone Twin Twelve -- I decided to try another guitar amp    (actually, I intend to build two identical single 12" combo's - one for me and one for my TWIN brother, Rich) .  Although I'm sure a Fender Deluxe knock-off would be just fine for what I needed , I wanted to do something a bit different __ Designed by Bob Danielak

Ampeg SB-12 Portaflex adapted for use as a bass overdrive stompbox -  When one thinks of classic bass amps, the brand name "Ampeg" often comes to mind.  Their SVT models were very popular and still are today.  Slightly less known Ampeg combo-type models were also made, called "Portaflex" amps.  In "travel" form, these appeared to be simple closed back speaker cabs with a pair of chrome latches on either side of the top panel.  When one released the latches, the top panel could be removed and flipped over to reveal a tube head unit.  One simply plugged in the attached speaker cable and the amp was ready to go.  The unique design led to the nickname of "Flip Tops." __ Contact: holler @ runoffgroove.Com

An ultra-flexible tonestack with clean boost. Schematic, photo & PCB/perfboard layouts. -  The Tonemender is a very flexible, yet simple clean boost with a 3-knob tonestack that allows the user to re-create the classic Fender, Marshall and Vox responses.  We suggest using a TLC2272 for the dual op-amp.  The TLC2272 is rated for low-noise and rail-to-rail output, which will offer the highest possible clean boost and dynamic range.  The NE5532 is another good choice, but a TL072 can also be used with decent results __ Designed by holler @ runoffgroove.Com

Analog MIDI Synthesizer -  Schematic only, no circuit description __ Designed by John Simonton

Arduino MIDI interface (Arduino MIDI Drum Kit & Spooky Sound Trigger) -  Hereís a quick project using techniques from this weekís class that turns an Arduino board and a few buttons and piezos into a MIDI drum kit or scary sound trigger.  Hide piezo sensors around the house during your Halloween party to trigger scary sounds when people walk around! __ Designed by todbbot blog

Audio effects: guitar phaser -  This circuit is a phaser circuit, as used in guitar foot-pedal effects.  It used 11 sections of op-amp such as LM324 but others will do.  The whole circuit works of a dual rail supply: +/- 9v.  The 0v rail is indicated by a chassis sign.  Make sure these supplies are well decoupled.  There is a spare section of one of the IC's which you could used to derive a center tap from an 18v supply.   __ Designed by Richard Torrens

Automation Comes to the Harmonica -  11-Mar-11 -Design News:   Advanced Automation has been edging into our working lives for decades.  While most of the inroads made by automation have been in manufacturing, these technologies are being increasingly applied in entertainment.  Jon Sorkin has created a gadget that plays programmed songs with a harmonica. __ Gadget Freak-Case #182

Azabache -  An original overdrive inspired by classic Fender amps.   __ Contact: holler @ runoffgroove.Com

Band Drummerís Microphone Switch -  I received an email from guy who plays drums for a small band.  He wanted a simple way to turn on and off his microphone with just a tap of his drum stick onto a small box.  The circuit below performs this task with the aid of a piezo device as a shock sensor and a small dual coil latching relay with two sets of contacts.  The contacts can be wired any number of ways to a microphone circuit . . . Hobby Circuit designed by David A. Johnson P.E.-October, 2011

Bass Guitar Amp -  I've been wanting to put these EL509's to use!!! Figured a nice high-power bass guitar amp would be a perfect application.  I have the amplifier built to the point shown in the schematic, above.  Initial testing with tone-stack replaced with a 10:1 voltage divider is very promising.  Still need to decide on the tone stack arrangement.  The unit is built as a stand-alone head, and will be used with a Peavey 15" + 2x 10" Bass cabinet __ Designed by Bob Danielak

Birdie Doorbell Ringer -  P1 is of experimental value.  Start with 220 Ohms or so and modify to suit your needs.  The transistor is a general purpose kind and is not critical, almost any PNP type will work.  L1 is a bell-transformer which is usually already present in the house.  If you wish, you could use a battery instead of the bell transformer.  Just hookup a 9-volt battery    (or wall adapter) to points 'A' and 'B'    (A=+) the diode    (D1) is to protect the circuit from accidental polarity reversal and is optional, but required as a rectifier for use with the bell transformer __ Designed by Tony van Roon  VA3AVR

Boogie MkI adapted for use as a distortion stompbox -  One of the first amps to offer distortion at lower volumes was the Boogie MkI amplifier.  As told by Randall Smith, the designer of the Boogie amp, these amplifiers were born of a practical joke on a guitarist friend.  Mr.  Smith modified a Fender Princeton to have considerably more gain and power, but appear stock.  As the story goes, Carlos Santana play-tested the amp and was impressed.  Carlos was quoted as saying the amp "really boogied!" Thus, the name of the amp was born.   __ Contact: holler @ runoffgroove.Com

Book PC MP3 Player -  A small computer running Linux with 12 volt power supply and wired remote control makes a great sound system for a car __ Designed by Bob Blick

BookPC Car MP3 Player -  This is an earlier player using a conventional PC motherboard, so the power supply I designed is quite compatible.   __ Designed by Bob Blick

Britannia -  An original overdrive inspired by the Vox AC-30 Top Boost amp.   __ Contact: holler @ runoffgroove.Com

Buffer switches analog or digital signals -  30-Mar-06 EDN-Design Ideas - Use an op amp and a dual SPST to switch signals under digital control __ Designed by Liviu Pascu, Kepco, Flushing, NY

Build a MIDI Drum Kit -  This do-it-yourself MIDI drum kit can produce just about any musical sound you can think of, either via a computer or a synthesiser.__ SiliconChip

Build a MIDI Drum Kit Part 2 -  Last month we introduced our latest MIDI instrument, the MIDI Drum Kit offering a staggering 546 drum sounds and not a stretched skin in sight! Here's all you need to know to put the control unit together - and it's not that difficult...__ SiliconChip

Build a MIDI Drum Kit Part 3 -  PART 3 - building the sensors and stand__ SiliconChip

Build a 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

Build a Stereo Synthesizer -  There are many ways to create a stereo effect.  If you were miking a piano, a string section, or some other large sound source, you'd probably stick up a pair of directional mikes and assign them left and right.  But what if you want to "enlarge" a lead vocalist? Or, how about other inherently mono instruments like an electric guitar or a synthesizer? Well, you could delay one side or use a Harmonizer or some other related gadgetry, but generally with this method the stronger the effect you create, the more you'll jeopardize mono compatibility.  A short delay will cause phase cancellations in mono, while longer delays can create a disturbing slap echo. __ Designed by Ethan Winer

Build a Theremin for a Really Eerie Sound -  You wave your hands around mysteriously to play it.__ SiliconChip

Build the Bass Blazer -  It gives a visual readout of the bass signals from your home theatre or car stereo system on four bargraph displays__ SiliconChip

Build Your Own Ball Bearing Beat Box -  Ubercool light show for any DJ. __ Contact: Jameco Electronics

Build Your Own Compact Bass Reflex Loudspeakers -  Would you like to build some high quality speakers and don't mind doing some enclosure assembly finishing? These M6 compact bass reflex systems from theloudspeakerkit.com could be just what you are looking for.  Use them on stands or on a bookshelf.__ SiliconChip

Build Your Own MP3 Jukebox Pt.1 -  Here's a fantastic way to play your MP3's.  It's based on a PC and features infrared remote control and an LCD to display track titles.__ SiliconChip

Build Your Own MP3 Jukebox Pt.2 -  Play all your favourite music by remote control__ SiliconChip

Building a Champ guitar Amp made out of Junk Parts -  As you see from the above circuit, this is a fairly simple circuit and take note that this one uses a tube rectifier in the power supply.   __ Designed by Jon Tirone, AKA John Fisher

Building a Musical Sunrise Quartz Alarm Clock -  For the past twenty years, Iíve been using an LED digital alarm clock-radio    (which I won as a door prize at a model airplane gathering in 1995) to wake up in the morning.  In recent years, Iíve found that the large glowing red digits disturb my    (and my wifeís) sleep, and felt it was time for something new __ Designed by Stepan Novotill

Building the Ultimate Jukebox -  Last month we looked at what we wanted in the Ultimate Jukebox.  Now let's start building it...__ SiliconChip

Building the Ultimate Jukebox; Pt 1 -  In the days of IPods, MP3 players and all manner of fit-in-your-pocket, "music on the go" devices, why on earth would anyone want to build a freestanding jukebox - which, by definition, is almost a piece of furniture?__ SiliconChip

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Musical Circuits:  #'s - C        D -M        N - S        T - Z


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