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Balanced Line Level to Unbalanced Guitar Level - AS092 Jenson
Transformer Application Note (app note 6/07) |
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Basic Electric Guitar pickup configuration. - Very basic
two-pickup configuration for electric guitar, with volume and tone controls.
(Circuit design added 10/06) |
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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.…. [Tony van
Roon's circuit] |
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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..... |
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BookPC Car MP3 Player - This is an earlier player using a
conventional PC motherboard, so the power supply I designed is quite
compatible. (schematic / circuit added 2/07) |
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Cheap Ambisonic Microphone & UHJ Encoder - Certainly not a Soundfield
microphone but a much cheaper if lower quality soundfield microphone, that you might
use for example for doing surround sound concert recordings of your favourite beat
combo, or any portable surround recording. (electronic circuit added : 7/08)
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Chebyshev Bandpass Filter - (circuit added 11/06) |
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Church Bell Controller - This circuit is a church bell controller. As you
can see on the above figure, this is the main circuit for the church bell controller.
The whole system is based on an ATmega32 microcontroller and a 24LC32 EEPROM memory is
being included into the circuit board too!....(circuit added 05/06) |
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Circuit Emulates Mechanical Metronome - 08/19/99 EDN-Design
Ideas....produces Timing signals with a sound like that of a mechanical metronome. IC1
is a555 Timer that oscillates at approximately3200 Hz. The two3-kW resistors and
the0.047-µF capacitor set the frequency. IC2.… EDN is migrating links. This link is
not verified. Google the "title" EDN for new link. |
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CMOS Inverter VCO tunes octave to UHF - 11/19/98 EDN-Design Ideas....A
robust and versatile vco provides a stable output to 300 MHz (Figure 1). The circuit's
simplicity, unconditional stability, and consistent high-drive capability over an
octave make the oscillator ideal for many applications, such as synthesized sources,
local oscillators, and transmitters. The AHCA robust and versatile vco provides a
stable output to 300 MHz (Figure 1). The circuit's simplicity, unconditional
stability, and consistent high-drive capability over an octave make the oscillator
ideal for many applications, such as synthesized sources, local oscillators, and
transmitters. The AHC....File has several circuits, scroll down.... [Design Idea
by Shawn Stafford, AM Communications Inc, Quakertown, PA] |
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Color Organ - This unit uses a PIC16F84 with an 8 bit A/D. The signal
from both stereo channels is combined and digitized. Each of 5 frequency bands
is processed using a 16 point FFT. Then the level of each channel is output as
PWM (pulse width modulation) to a set of solid state relays.…. [Luhan Monat - Mesa
Arizona] |
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Colour (Sound) Organ (Aaron Cake) - Anyone who has been to a night club,
concert or school dance has probobly seen a colour organ. Colour organs cause lights
to blink and flash to music from your TV, stereo, guitar and even your own voice. The
colour organ presented here needs no connection to the sound source, it picks up sound
from its built in microphone. (added 04/03/02) |
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Colour Organ - Three Lamp-Channels Output - Built-in Electret Microphone
(circuit added 12/2009) |
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Compressor/Limiter/Clipper for FM broADCasting - Audio signals as music or
speech have big dynamic ranges. There are silent and loud sections. These audio
signals aren't too good for a transmitter, which requires audio signal with constant
level on the input. Limiter is a device,….... |
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Constant Q Graphic Equaliser - Constant Q design. Can be made using as many
or as few sections as needed..... |
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Cookie Tin Ion Chamber - Simple steps for using a power amplifier as a
second cue system. Designed by George Kourounis (Circuit design added
04/05/06) |
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CPLD automatically powers itself off - 13-Apr-06 Issue of EDN Add a
few discrete components to a CPLD to implement a battery-powered system's power-down
circuit.... [Design Idea by Rafael Camarota, Altera Corp, San Jose, CA; Edited by Brad
Thompson and Fran Granville] |
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CPLD autonomously powers battery powered system - 12-Apr-07 Issue of EDN
CPLD controls power-on and off of intermittent-battery-powered system.... [Design Idea
by Rafael Camarota, Altera Corp, San Jose, CA; Edited by Charles H Small and Brad
Thompson] |
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Designing an OpAmp Headphone Amplifier (Solid State & Tubes) - Design
principles and circuits for building opamp-based headphone amplifiers. This
article reviews selection criteria, feedback configurations, capacitor coupling, RF
shielding, output stage topology, short circuit protection, equalization, acoustic
simulation, headphone distribution amplifiers and power supply options. Also discusses
design with tube amp-blocks (AC feedback....Designed by HeadWize (Circuit design
added 04/05/06) |
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Digital Guitar Tuner - (electronic circuit added 4/05) |
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Digital Volume Control - This circuit could be used for replacing your
manual volume control in a stereo amplifier. In this circuit, push-to-on switch S1
controls the forward (volume increase) operation of both channels while a similar
switch S2 controls…(circuit added 6/07) |
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Digital-Volume Control - This circuit could be used for replacing your
manual volume control in a stereo amplifier. In this circuit, push-to-on switch S1
controls the forward (volume increase) operation of both channels while a similar
switch S2 controls reverse (volume decrease) operation of both channels.…....
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DIY Serial MIDI Interface 80C51/80C31 Version - (diagram added 2/07)
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Drum tone Oscillators - (electronic circuit added 4/05) |
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Dual Analogue Frequency Shifter - An audio effects frequency shifter similar
to the famous Bode/Moog design from the 1970s. (electronic circuit added : 7/08)
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Dual phantom power pre-amp - (electronic circuit added 1/07) |
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ElectricPickup - I have an unused 900 MHz antenna sticking out of my chimney
that has an ungrounded vertical element. I replaced the 12 inch element with a two
yard aluminum rod (see photo). The antenna is only 75 feet from the power
lines so I didn't have much hope for this antenna to work. The lead-in coax is long so
its capacitance (about 1,500 pF) forms a voltage divider with the capacitance of the
antenna so the signal is significantly....(electronic design added (6/07) |
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Electronic Canary - This circuit is a modified hartley oscillator with a
couple of extra components included. The transformer is a small audio transformer,
type LT700. The primary is center tapped with an impedance of 1Kohms at 1KHz . The
secondary has an impedance of 8 ohms....(electronic schematic / circuit added 4/02)
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Electronic Church Bell Controller - This circuit is a church bell
controller. Basic component is an ATmega32 microcontroller. At the circuit 2 24LC32
eeprom memories is being used, the 1st for internal standard melodies and the 2nd one
is for user's compositions. This feature will be provided in the future....
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Electronic Metronome - (electronic schematic / circuit added 4/02)
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