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

Last Updated: October 18, 2017 05:04 AM

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

µC generates musical sounds -  EDN-Design Ideas – April 15, 1999    [ NOTE : File has multiple design, scroll for this one.]  Many modern devices send audible signals to their operators to indicate some of the predetermined conditions or states of the system under control.  To avoid annoying human sensibilities, these sounds should match the musical scale.  Several chips on the market provide such sound capabilities; for example, a programmable sound generator or an ISD1016 voice messager.  The circuit in Figure 1 does not use a dedicated sound generator but rather generates sounds using software routines.  The circuit uses an inexpensive MC68H705J1A µC and saves additional expense by eliminating the need for a sound chip.  In Figure 2a, a note represents the pitch of each musical tone; Figure 2b shows the duration of the tone __ Circuit Design by Abel Raynus, Armatron International, Melrose, MA

1 Transistor Theremin -  This design is from a magazine called "Divirta-se com a Eletrônica", which translates to "have fun with electronics", and, indeed, is very fun.  For those who don't know what a Theremin is, it's one of the first synths ever made and it's named after his inventor, Mr.  Leon Theremin    (a Russian guy) .  It's perhaps the only instrument which you don't actually touch: there's an antenna, and as the musician moves his hand near it, the pitch changes.  That's the thing Page used in "Whole Lotta Love"    (he used it with an echo, to get even weirder) .  This circuit is a very simplified version of a theremin, but is also very easy to build and really works!
10 to one voltage divider for direct input -  Very simple DI-box idea for your guitar amp output

100 Watt Amp -  Here is a simple and cheap amp to make.  I could have made the circuit board smaller but "what the heck"
 __ Designed by Jon Tirone, AKA John Fisher

100W Guitar Amplifier -  Guitar amplifiers are always an interesting challenge.  The tone controls, gain and overload characteristics are very individual, and the ideal combination varies from one guitarist to the next, and from one guitar to the next.  There is no amp that satisfies everyone's requirements, and this offering is not expected to be an exception __ Designed by Rod Elliott  ESP

101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU -  Why would you want to interface the Keyboard? The IBM keyboard can be a cheap alternative to a keyboard on a Microprocessor development system.  Or maybe you want a remote terminal, just couple it with a LCD Module.  Maybe you have a RS-232 Barcode Scanner or other input devices, which you want to use with existing software which only allows you to key in numbers or letters.  You could design yourself a little box to convert RS-232 into a Keyboard Transmission, making it transparent to the software __ Designed by Craig Peacock

10W Audio Amplifier with Bass-Boost -  High Quality, very simple design No need for a preamplifier __ Contact: Flavio Dellepiane, fladello @ tin.it

2 Note Ribbon Controller -  Even if you've never played with a ribbon controller you have at least seen one and know what they are.  They are far and away the most organic and intuitive controller available for synthesizers.  Sliding a finger up and down the ribbon can control the pitch of an oscillator or some other parameter.   __ Designed by John Simonton

200W MOSFET Amplifier -  A compact audio powerhouse ideal for guitar or PA work or for use as a general-purpose subwoofer or hifi amplifier.  Many people prefer MOSFETs because of their legendary ruggedness.  Altronics had a MOSFET amplifier module which produced 200W 

22/7-A CMOS implementation of the Big Muff Pi -  This circuit was born with the idea of making a CMOS workalike of the well known Electro-Harmonix Big Muff Pi    (BMP) .  We chose the name Twenty-two Sevenths or 22/7 since it is a rational approximation of pi.  The gain and frequency response of each stage were adjusted to match the corresponding stage on a BMP.  The result is a rich and full sounding pedal that evokes some of the fuzz sounds circa 1969, as well as some classic singing leads.   __ Contact: holler @ runoffgroove.Com

2-9v battery-powered Amps based on the LM386. Schematic & PCB/perfboard layouts. -  For better compatibility with effects driving the Little Gem, a FET buffer can be added.  Both the Little Gem Mk II    (seen below) and Ruby schematics include a simple buffer design.  No further circuit modifications are necessary, however the input capacitor value of the amp may need to be adjusted to taste. __ Contact: holler @ runoffgroove.Com

2A3 Push-Pull Class a Stereo Amp -  The input stage is comprised of a both halves of a 6SL7 octal dual hi-mu triode in a differential amp configuration with a 1ma constant current cathode load.  I'm using field-effect    (constant-current) diodes for simplicity.  the diff amp approach was chosen for good power supply rejection, ease of balancing, good gain, and ease of application of *feedback*, if desired    (hey, i like to keep an open mind) .  It also takes care of phase-splitting right up front.  Note: I've returned the constant current diode cathode to -9V instead of ground in order to avoid the non-linearities about the pinch-off region    (Vpo ~= 1.5V)  __ Designed by Bob Danielak

2-channel guitar preamplifier, Pt 1 -  Each channel has bass, mid and treble controls and there's an optional digital reverberation unit as well.__ SiliconChip

2-Channel Guitar Preamplifier, Pt 2 -  Add life to your music with this easy-to-build digital reverberation board.  It uses two digital delay chips to give realistic effects.__ SiliconChip

2-channel Guitar Preamplifier, Pt 3 -  Pt.3: Building the preamps and reverb module into a metal rack case__ SiliconChip

2m-20m Transverter -  This little circuit is a transmitting and receiving converter    (transverter) that converts a FT290 or similar multimode handheld transciever to the 14MHz amateur band.  The project is a single board module that needs an external local oscillator, for example, the VHF harmonic oscillator    (or QRP VHF FM TX) LO for transverter project.  It should be a relatively simple matter of scaling coils __ Designed by Harry Lythall-SM0VPO

300 Watt Subwoofer Power Amplifier -  There are some important updates to this project, as shown below.  Recent testing has shown that with the new ON Semi transistors it is possible to obtain a lot more power than previously.  The original design was very conservative, and was initially intended to use 2SA1492 and 2SC3856 transistors    (rated at 130W) - with 200W    (or 230W) devices, some of the original comments and warnings have been amended to suit.   __ Designed by Rod Elliott  ESP

5 Band Graphic Equalizer using a Single IC/Chip -  This circuit uses a single chip, IC BA3812L for realizing a 5 band graphic equalizer for use in hi-fi audio systems.    BA3812L is a five-point graphic equalizer that has all  required functions integrated onto one IC. IC is comprised of  five tone control circuits and input and output buffer Amplifiers __ Designed by Paul S

60W Bass Amplifier -  Low-cut and Bass controls; Output power: 40W into 8 Ohm and 60W into 4 Ohm loads __ Contact: Flavio Dellepiane, fladello @ tin.it

60W Class-A Power Amp -  This circuit is on last page.    There is one amplifier configuration that is universally accepted as the ideal for audio use: Class A operation.  Many early amplifiers operated in Class A, but.  

60W Guitar Amplifier -  This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker   (s) .  The advantages for a guitar amplifier are the very simple circuitry, even for comparatively high power outputs, and a certain built-in degree of loudspeaker protection, due to capacitor C8, preventing the voltage supply to be conveyed into loudspeakers in case of output transistors' failure __ Contact: Flavio Dellepiane, fladello @ tin.it

60W MOSFET Amplifier -  To celebrate the hundredth design posted to this website, and to fulfil the requests of many correspondents wanting an amplifier more powerful than the 25W MOSFET, a 60, 90W High Quality power amplifier design is presented here.  Circuit topology __ Contact: Flavio Dellepiane, fladello @ tin.it

60W Power Amplifier -  This is a simple and low cost 60W power amplifier.  The optimal supply voltage is around 50V, but this amp can work from 30 to 60V.  The maximum input voltage is around 0.8, 1V.  As you can see, in this design the components have a big tolerance, so you can build it with almost any components that you can find at home.  The output power transistors can be any NPN types, but do not use Darlington types.   __ Designed by Jacint Chapo

6-12Vin to ±5V AT 50mA Split Supply -  An easy-to-implement split-voltage power supply using the LTC3388 yields a low quiescent current, high efficiency solution for powering low current analog circuits that need a virtual ground output.  The output voltage of each device is digitally programmable to four output voltages from 1.2V to 5.0V and will support a load __ Linear Technology/Analog Devices App Note, Jan 30th 2012

65W HEXFET Power Amplifier  -  A medium power amplifier that is characterized by a lot of good sound quality, but simultaneously is very simple in the construction.  Him uses, enough time in my active loudspeakers.  In his output stage exist the very good FET transistors, technology HEXFET, 

70 Watt Guitar Amplifier -  Easy to build - No setup required - Stacked tone controls; High performance: 70W into 4 Ohm - 45W into 8 Ohm loads __ Contact: Flavio Dellepiane, fladello @ tin.it

8 Note Tune Player -  This neat little circuit can play 8 note tunes at any speed you want.  You select the notes with 8 trim pots.  The speed in selected through a ninth pot.  The circuit draws very little power and can be powered by a 9 volt battery, with the addition of a 7805 regulator to power the TTL logic used. __ Designed by Aaron Cake

8 watt Audio Amp -  Here is the schematic for an 8 watt audio amp.  This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp.   __ Designed by Aaron Cake

9-Volt Battery Eliminator -  for guitar pedals, radios etc __ Designed by G. Forrest Cook


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


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