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Musical Circuits   Page 1
Musical Circuits:  #-A     B-E     F-G      H -L     M       N-T     U-Z

Last Updated on: Tuesday, April 01, 2014 04:29 AM

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

µC generates musical sounds -  04/15/99 Issue of EDN  Many modern devices send audible signals to their operators to indicate some of the predetermined conditions or states of the system under control.....Page includes several designs.  Scroll to find this one.... [Design Idea by Abel Raynus, Armatron International, Melrose, MA]/
10 to one voltage divider for direct input -  Very simple DI-box idea for your guitar amp output....(Circuit design added 10/06)
100 Watt Amp Circuit (Rod Elliott) -  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,....(design added 01/2010)
100W Audio Amplifier -  This is an exceptionally well designed amplifier, with a lot of power reserve, high fidelity, low distortion, good S/N ratio, high sensitivity, low consumption and full protection….(electronic design added 08/08/08)
100W Guitar Amplifier -  (project / circuit added 9/06)
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....(design added 5/09)
10W Audio Amplifier with Bass-Boost -  High Quality, very simple design No need for a preamplifier  (added 4/05)
12 Watt Valve Guitar Amp -  (electronic design added 02/03/04)
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…(circuit added 04/08)

25-Pin PC Serial Port to MIDI Synthesizer Interface Cable -  (circuit / schematic design added 2/07)
2-Input Mixer -  As simple as it gets.  mixer consists of two transistor-based preAmplifiers.  first one (designated "Mike in") offers higher gain. it works well with a regular dynamic microphone.  second one can be used to control audio input from a tape recorder/CD player.  (added 6/06)
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.... [from Harry Lythall's website]
2-Way Passive Guitar Splitter -  AS013 Jenson Transformer Application Note.  From one guitar to two guitar amplifiers  (app note 04/03/02)
300W Subwoofer Power Amplifier -  Please note that  specification for this amp has been upgradded , and it is now recommended for continuous high power into 4 Ohms, but You will need to go to extremes with  heatsink (fan cooling is highly recommended). It was originally intended for "light"....(added 4/05)
4-Way Active Guitar Splitter -  AS014 Jenson Transformer Application Note.  From one guitar to up to four guitar amplifiers  (app note 04/03/02)
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.…. (added 10/05)
60W Bass 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. The preamp is powered by the same 60V rails as the power amplifier, allowing to implement a two-transistors gain-block capable of delivering about 20V RMS output.  This provides a very high input overload capability. ….(design added 11/08)
60W Class-A Power Amp -  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….(circuit added 04/05/06)
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….(added 3/05)
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…(design added 04/05/06)
60W Power Amplifier -  This paper gives a practical example of the design of an off-line switching power supply. Factors governing the choice of a discontinuous flyback topology are discussed. The design uses a pulsed-width modulation (PWM) control scheme implemented with a Unitrode UC3840 IC....(circuit added 04/05/06)
60W Power Amplifier (Jacint Chapo) -  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. ….(design added 11/08)
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,....(added 07/07/07)
8 Note Tune Player (Aaron Cake) -  Circuit plays 8 note tunes at any speed (added 5/02)
9-Pin PC Serial Port to MIDI Synthesizer Interface Cable -  (circuit / schematic design added 6/06)
A Pocket Headphone Amplifier -  This is a Chu Moy headphone amp I made. I got the PCB design from Guzzler from Head-Fi and the original design is very popular and is here. I changed Guzzler's layout so I could use a Taiwan Alpha pot on the PCB. These pots a high quality (some say better than ALPS blue velvet) and are available from Jaycar. You can see the thread here. I also made a DIY Brown dog adapter so I could use two OPA627 single opamps in a dual opamp socket.
A Portable DAC with Headphone Amplifier -  This portable DAC can improve the sound from portable devices, such as PCDPs, and other digital gear that has a TOSLINK optical or coax digital output. It features the Burr-Brown DIR1703 receiver and the Analog AD1866 DAC ICs for digital conversion and a high-quality multi-loop headphone amplifier that can drive low-impedance loads with authority....Designed by Andrija Ifkovic  (Circuit design added 04/05/06)
A440 Synth Tuning Crystal Controlled Oscillator -  A cheap little crystal controlled sine wave reference oscillator unit, for tuning your analogue synth to. (electronic circuit added : 7/08)
Add harmony to your system -  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]….... [Design Idea 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.... [Design Idea by Rodger Richey, Microchip Technology Inc, Chandler, AZ]
Amiga MIDI interface -  (diagram added 2/07)
An Equalization Circuit for the beyerdynamic DT990 Pro Headphones -  This passive EQ corrects a rising characteristic in the frequency response of the beyerdynamic DT990 Pros and turns them into one of the most natural and accurate sounding headphones on the market…. [Designed by LXH2]
Analog MIDI Synthesizer -  (circuit / schematic design added 6/06)
Apple Macintosh MIDI interface schematic basic version -  (electronic circuit added 2/07)
Apple Macintosh MIDI interface schematic deluxe version -  (diagram added 2/07)
Audible metronome -  Figure 1 is the schematic for the Electronic Metronome. The design is based on a LM555 timer integrated circuit. The oscillation frequency is determined by C1, R1, R2, and R3. R1 is a 1 Megohm potentiometer and is used to set the oscillation frequency. The duty cycle is 50% and the oscillation period can be varied between 0.3 and 3 seconds....(Circuit design added 06/07/08)

Musical Circuits:  #-A     B-E     F-G      H -L     M       N-T     U-Z

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