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Audio Circuits:  Level, Tone and Balance Circuits
Audio Circuits -- Main Page

Automatic Level Tone Balance:  #'s - A      B - H      I - R      S - Z


Last Updated: December 25, 2017 01:44 PM

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

IC tone control preamplifier using single 741 opamp -  Schematic only, no circuit description

Improved Pl Tone Decoder -  A significant amount of interest has been generated since my last article on a PL tone board.  Because of this interest I decided to improve on the old PL tone design.  Figure 1 is an inexpensive PL tone generator with significantly improved performance.  It has a much more stable tone frequency as well as the elimination of the loading problem on the output.  The transistor used in the old circuit would cause the tone frequency to change at high levels.  This month's circuit eliminates all those problems __ Designed by Radio Amateur Society of Norwich

Infrared remote control receiver -  You can control now your media center with this programmable RC5 receiver.  Moreover, you can switch On/Off your Media Center by your remote control __ © Vassilis Serasidis

Infrared Remote Volume Control -  This is a true 'minimalist' remote, having but three functions: Volume Up, Volume Down and Mute Volume is controlled by a motorized (motorized for US readers) pot rather than any of the 'digital' pots that now abound, and this was done for a number of very good reasons. 

Inverted Bipolar Transistor Doubles as a Signal Clamp -  06/07/01 EDN-Design Ideas A number of circuits, such as level detectors and AM demodulators, benefit from a rectifier with a low offset voltage.  Silicon diodes have an offset of approximately 0.6V and do not work well in low-level circuitry.  A Schottky diode is a bit better__ Circuit Design by Art Hogrefe, Puma Instrumentation, State College, PA

IR Remote Volume Controller -  Imagine the convenience of selecting TV channels using your remote and then pointing the same remote to your switchboard to switch on/off the fan or the tube light.  Here is a simple circuit to remotely switch on/off any electrical device through a relay using the normal TV/ VCR/VCP/VCD remote control unit.  It works up to a distance of about 10 metres. __ Contact: IQ Technologies

Level indicator with 10 LED -  Schematic + PBC layout __   Jan Kolar

Level meter for home theatre systems -  Having trouble adjusting the levels in your home theatre system? This simple project makes the job easy. __ SiliconChip

Magnetic Longwire Balun (MLB) also usable for dipoles and homemade RF choke -  Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU

Magnetic longwire balun and VHF-splitter -  Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU

Mono Hi-Fi Tone Control -  This is the mono tone control circuit.  The circuit will give you high fidelity (hi-fi) output.  Built the 2 similar circuit to make it stereo.  Use high quality electronic parts for better audio output quality. 

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

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

Notch Filter Autotunes for Audio Applications -  24-Jun-10 EDN-Design Ideas Tracking notch filters find use in harmonic-distortion analyzers; they also can remove heterodyne noise from ham-radio systems.  A conventional tracking switched-capacitor notch filter relies on a bandpass filter, a voltage-to-frequency converter, and a notch filter to track the incoming signal and remove undesired tones.  The bandpass filter in these circuits sometimes adjusts to the wrong frequency, meaning that the undesired tone would have no attenuation__ Circuit Design by John R Ambrose, Mixed Signal Integration, San Jose, CA

Parametric & Graphic Eq's Plus Peaks & Notches -  If you're into playing with tone controls and notch filters to see how they change the sound out of your effects, you will undoubtedly have built several glops of R's, C's and pots, maybe some L's to make up the tone networks.  While this is fun, it's not very flexible.  Sooner or later you might wonder if there is a more general solution to messing with tone controls. __ Designed by © 1999 R.G. Keen

Passive filters fill the bill at audio frequencies 02/01/01 EDN-Design Ideas Low-frequency filters, particularly at audio frequencies, usually take the form of active filters.  These filters eliminate expensive inductors with windings of many turns.  Both analog and digital active filters are most compatible with large-scale integration at the subsystem and system levels.  __ Circuit Design by Richard Kurzrok, Queens Village, NY

PC Speaker Volume Control -  This simple circuit can be used to control the volume of PC speaker.  The volume can be adjusted to any value between total silence and full volume. __ Designed by Tomi Engdahl

Peak reading audio level meter -  indicates peak audio response on an analogue meter, similar to a tape recorder recording level meter __ Designed by Andy Collison

Pre-amp with tone control -  This a 2 in 1 circuit where 2 modules joined in one circuit.  With this circuit, you no longer use tone control circuit before your amplifier, but you can add an equalizer between this circuit and your amplifier circuit.  In this circuit, P1 is used to control the volume level, P2 to control Bass level and P3 controls Treble level.

QRP Longwire balun -  Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU

Remote Volume Control & Preamplifier Module -  This up-to-date control module works with any universal infrared remote and features a blue LED readout and an optional rotary encoder.  Its ability to both attenuate and amplify means that it can operate as a simple volume control or as a high-performance stereo preamplifier! __ SiliconChip

Remote Volume Control for Stereo Amplifiers -  You can add a remote motorised volume control to just about any stereo amplifier.  Here's how to do __ SiliconChip

Remote Volume Control for the Ultra-LD Amplifier -  Revised preamp board lets you add our remote Volume Control unit to the Ultra-LD Stereo Amplifier __ SiliconChip

Remote Volume Control Part 2 -  Second article completes the construction & gives the set-up procedure __ SiliconChip

Resistor-Switch Networks for Audio Volume Control -  The traditional potentiometer is implemented with an electrical contact that slides over a resistive layer.  An example of a well-known audio-grade potmeter is the Alps Blue.  I still use this one myself.  A high-end (good and costly) alternative is the rotary switch.  This device consists of a series of discrete resistors and switches, of which always one switch is actually closed.  Resistor-switch networks can offer advantages over the potentiometer such as: * Improved quality of the electrical contact, in comparison with the slider.  * Improved consistency between separate audio channels (stereo or multi-channel) * Less sensitive to dust and wear. 

Reverse RIAA Equaliser -  Test phono preamps for correct equalisation, or convert unused phono inputs. __ Designed by Rod Elliott  ESP

Automatic Level Tone Balance:  #'s - A      B - H      I - R      S - Z

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