| 2 Watt Amplifier (Andy Collinson) - Low distortion Amplifier using discrete components (diagram added 6/03) |
| 3 Band Equalizer - Using a single op-amp this easy to make equalizer offers three ranges, low frequency,mid frequency,and high. With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz. Supply voltage may be anything from 6 to 30 Volts. Maximum boost 20dB is only realized with maximum supply voltage....(electronic design added 6/07) |
| 30 Ddm to +30 Ddm Audio Level Meter - circuit with balanced input and adjustable gain to drive needle type VU meter, uses special amplifier module from Op-Amp Labs (added 6/06) |
| 300 Watt Subwoofer Power Amplifier - (electronic circuit added 7/03) |
| 555 Timer MonoStable Circuit using Pushbutton - The two circuits above illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period. For shorter periods, a capacitor can be used to isolate the switch....(schematic added 04/05/06) |
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| A Better Volume Control - A volume control using a linear pot that is much better than most log pots (added 05/06/07) |
| A Stereo Digital Volume Control based on the CS3310 - The CS3310 is a complete stereo digital volume control designed specifically for audio systems. It features a 16-bit serial interface that controls two independent, lowdistortion audio channels. The CS3310 includes an array of well-matched resistors and a low noise active output stage....(data sheet added 07/07) |
| Active Subwoofer and Controller - (electronic circuit added 7/03) |
| AN011 Jitter Testing Procedures for Compliance with AT&T 62411 - (app note added 6/07) |
| AN012 AT&T 62411 Design Considerations Jitter and Synchronization - (app note added 6/07) |
| AN016 Jitter Attenuation Performance of the CS61575 and CS61575A - (app note added 6/07) |
| AN543: Tone Generation - Microchip Application Note Published 26-Aug-97 (app note added 2/06) |
| Audio Graphic Equaliser - simple 7 band equalizer (added 4/02) |
| Audio Level Indicator - Audio Amplifier output relay delay (added 6/06) |
| Audio Level Meter - The circuit has a flat frequency response from about 20Hz to well over 50Khz. Input sensitivity is 100mV for a full scale deflection on a 100uA meter. Built on two common emitter amplifiers, the first stage has a preset resistor which may be adjusted for a FSD.....(schematic design added 7/03) |
| Audio level meter VU Meter - This circuit uses just one IC and a very few number of external components. It displays audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs providing a logarithmic 3 dB/step analog display. LED current drive....(added 9/06) |
| Audio Tone Control - designed by Aaron Cake (circuit added 7/02) |
| Audio Tone Controls - Many people at one time or other, regardless of their interest in electronics, have adjusted these controls to suit their preference. Whether its to boost the bass of their favorite CD, cut the noise / static on a talk radio station or compensate for poor loud speaker response, they've reached for the treble and bass tone controls. The ni....(circuit diagram added 02/09) |
| Automatic Loudness Control - Simple add-on module Switchable "Control-flat" option (added 3/05) |
| Beetle Mk III - This project is based on our most stable FM transmitter. It has a number of features, with a volume control to adjust the input level and a small, neat box to make it easier to attach to a guitar. The volume control is positioned at the end and when turned up fully, the transmitter provides fuzz (distortion). (design added 08/08/08) |
| Build a Simple Soft Action Muting Switch - 10/14/04 - EDN-Design Ideas: The circuit in Figure 1 adds a soft muting switch with power-up/power-down muting to a line-level audio circuit. R4, C1, and JFET Q1 quietly ground a signal in 100 to 200 msec when you close S1 or release it when you open S1. Potentiometer R2, set to twice Q1's cutoff voltage, makes on/off transition.....(design idea added 10/05) |
| Calibrating the Current Offset Bias (COB) Register for the DS278x Family of Fuel Gauges - Maxim App Note 4188 -- 3/10/2008 -- (app note add 5/08) |
| Delay Unit For Surround Sound - The Mitsubishi M65830 Digital Delay IC has been discontinued (for reasons beyond my comprehension), and so far a suitable replacement device has not been found. This means (of course) that you will be unable to build this delay circuit. I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located. The project will be updated at that time. In the meantime, just ignore the delay circuit .... (schematic / circuit design added 9/02) |
| Designing with the LMC835 Digital Controlled Graphic Equalizer - National Semiconductor Application Note 04-Nov-1995 (app note added 4/02) |
| Digital Delay Unit For Surround Sound - The Mitsubishi M65830 Digital Delay IC has been discontinued (for reasons beyond my comprehension), and so far a suitable replacement device has not been found. This means (of course) that you will be unable to build this delay circuit. I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located. The project will be updated at that time. In the meantime, just ignore the delay circuit .... (schematic / circuit design added 9/02) |
| Digital Volume Control - Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination. Here it is for 0.3 second period.….(design added 08/08) |
| Digital Volume Control - Fair Warning - Annoying Popup 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) |
| Digital volume control (Aaron Cake) - based on DS1669 Digital Pot IC (added 8/03) |
| Digital Volume Control has Log Taper - 04/11/02 - EDN-Design Ideas: Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw: a nonlogarithmic step increment. To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper.....(design idea added 12/04) |
| 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.….(design added 08/08) |
| Dual Channel Digital Volume Control - (electronic Circuit / Schematic added 10/04) |
| Easy Parametric and Graphic Eq's Plus Peaks and Notches - (electronic circuit added 8/02) |
| Expandable Graphic Equaliser - The project described in this article is a constant Q, fully expandable graphic equaliser. Where most "conventional" graphic EQ circuits have a Q that is dependent on the setting of the pot, this one maintains the same Q at all settings. This is achieved....(electronic design added 6/07) |
| Guitar Control - CaStand-alone, 9V battery powered unit . Three-level input selector, three-band tone control (added 3/05) |
| Improved Pl Tone Decoder - (electronic circuit added 7/03) |
| 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.….(circuit design added 03/09) |
| 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. ….(design added 11/08) |
| IR Remote Volume Controller - ….(circuit design added 08/08) |
| Level indicator with 10 LED - (schematic / circuit added 2/07) |
| Musical Instrument Expandable Graphic Equaliser - standard equalizer plus bonus distortion unit (added 4/02) |
| Parametric and Graphic Eq's Plus Peaks and Notches - (electronic circuit added 8/02) |
| Passive Filters Fill the Bill at Audio Frequencies - 02/01/01 - EDN-Design Ideas:.....(design idea added 05/03) |
| PC Speaker Volume Control Circuit - 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…..(circuit / schematic design added 6/06) |
| PC Speaker Volume Control Circuit #2 - (electronic circuit added 8/02) |
| Peak reading audio level meter - This circuit will only work with a MOSFET type opamp, bipolar types i.e. 741 and J-FET opamps such as LF351 will not work in this circuit. (schematic added 6/07) |
| 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....(added 08/08/08) |
| Reverse RIAA Equaliser - As the amplification of a phono input is quite high, this pre-equaliser network can be made completely passive. The frequency response of the current through the network formed by R1, R2, C1 - C4 corresponds to the inverse of the standard RIAA curve, so these ....(electronic design added 6/07) |
| Self-Tune Filter - "QRP" receivers and transmitters, for HF CW are often based upon VFO tuning which can be a problem, especially when using the higher frequency bands. I have found that frequency drift is quite annoying at the best of times, but back in 1972 I found this little circuit. It is a narrow band-pass filter, based upon the LM201 OP-Amp. The circuit .... (electronic circuit added 4/05) |
| Simple Easy Parametric and Graphic Eq's Plus Peaks and Notches - (electronic circuit added 8/02) |
| Simple Surround Processor - This is a simple Surround Processor with the degital delay method. This audio processor is not using any special function ICs that difficult to get parsonaly, and desined in only general purpose ICs. Of course the Digital Delay Block of A-D, D-A and delay logic is also using only general purpose ICs. This is the key feature that easy to build it. (electronic design added 6/07) |
| Simple Surround Sound Decoder - This surround-sound decoder is based on the "Hafler" principle, first discovered by David Hafler sometime in the early 1970s. The original idea was to connect a pair of speakers as shown in Figure 1, for use as the rear speakers in the surround setup....(electronic design added 6/07) |
| Smooth Tone Clickless CW Sidetone Generator - This circuit is about as good as it gets for generating morse code tones. It may be used as a code practice oscillator, a tone generator for a keyer, a sidetone oscillator for a CW transmitter or an audio Modulated CW (MCW) generator for an FM transmitter or repeater....(electronic design added 6/07) |
| Soft Switching Amplifier with Tone Controls - (schematic / circuit design added 9/02) |
| Stereo Test Tone Generator - The purpose of this circuit is to create a pair of sine waves for testing stereo equipment. While it is useful for many types of audio test tone generation, the circuit is specialized for the purpose of aligning….(electronic design added 6/07) |
| Stereo Width Controllers - 2 to choose from. Expand or contract the stereo sound stage(schematic / circuit design added 9/02) |
| Subwoofer Equaliser - The Linkwitz transform circuit is a hugely flexible way to equalize the bottom end of a sealed loudspeaker enclosure. A speaker that is corrected using this method is flat from below resonance to the upper limit of the selected driver. The low frequency roll off point is determined by the parameters of the transform circuit. Should the enclosure ... (added 7/03) |
| Self-Tune Filter - "QRP" receivers and transmitters, for HF CW are often based upon VFO tuning which can be a problem, especially when using the higher frequency bands. I have found that frequency drift is quite annoying at the best of times, but back in 1972 I found this little circuit. It is a narrow band-pass filter, based upon the LM201 OP-Amp. The circuit .... (electronic circuit added 4/05)Simple Easy Parametric and Graphic Eq's Plus Peaks and Notches - (electronic circuit added 8/02) |
| Simple Surround Processor - This is a simple Surround Processor with the degital delay method. This audio processor is not using any special function ICs that difficult to get parsonaly, and desined in only general purpose ICs. Of course the Digital Delay Block of A-D, D-A and delay logic is also using only general purpose ICs. This is the key feature that easy to build it. (electronic design added 6/07) |
| Simple Surround Sound Decoder - This surround-sound decoder is based on the "Hafler" principle, first discovered by David Hafler sometime in the early 1970s. The original idea was to connect a pair of speakers as shown in Figure 1, for use as the rear speakers in the surround setup....(electronic design added 6/07) |
| Smooth Tone Clickless CW Sidetone Generator - This circuit is about as good as it gets for generating morse code tones. It may be used as a code practice oscillator, a tone generator for a keyer, a sidetone oscillator for a CW transmitter or an audio Modulated CW (MCW) generator for an FM transmitter or repeater....(electronic design added 6/07) |
| Soft Switching Amplifier with Tone Controls - (schematic / circuit design added 9/02) |
| Stereo Test Tone Generator - The purpose of this circuit is to create a pair of sine waves for testing stereo equipment. While it is useful for many types of audio test tone generation, the circuit is specialized for the purpose of aligning….(electronic design added 6/07) |
| Stereo Width Controllers - 2 to choose from. Expand or contract the stereo sound stage(schematic / circuit design added 9/02) |
| Subwoofer Equaliser - The Linkwitz transform circuit is a hugely flexible way to equalize the bottom end of a sealed loudspeaker enclosure. A speaker that is corrected using this method is flat from below resonance to the upper limit of the selected driver. The low frequency roll off point is determined by the parameters of the transform circuit. Should the enclosure ... (added 7/03) |
| Three Band Equalizer - (schematic / circuit design added 9/02) |
| Three Level Audio Power Indicator - Battery-operated3 LED display that connect it to loudspeaker output (added 04/02) |
| Three-band, Active Tone Control - Provides Bass, Midrange and Treble boost and cut. Single-supply operation. (circuit design added 9/06) |
| Tone Control (Aaron Cake) - This simple tone control can be used in may audio applications. It can be added to amplifers, used as a stand alone control module, or even built into new and exciting instruments. It's one IC construction makes it a very compact circuit, as only a few support components are required. Plus, it does not use a dual power supply.... designed by Aaron Cake (electronic circuit added 04/05) |
| Tone Control (Andy Collinson) - Based on the classic Baxendall tone control circuit, this provides a maximum cut and boost of around 10dB at 10K and 50Hz. As the controls are passive, the last transistor provides a slight boost. The output….(added 9/02) |
| Tone Controls with 2x Ne 5532 - check also PCB design and notes (added 4/02) |
| Tone detect with the NE567 T - one detection circuit with the NE567 (electronic design added 08/08/08) |
| Tone Detector - (electronic circuit added 7/03) |
| Tone Generation - Microchip Application Note Published 26-Aug-97 (app note added 2/06) |
| Tone Generator - (electronic circuit added 7/03) |
| Two Tone Generator - This two-tone generator includes 3 ICs NE555 Astable Multivibrators. You can vary the duration of each tone by changing the 10k resistor or 100MF capacitor at IC1 or changing resistors and capacitors at IC1/2 for higher or lower tone. Designed by Andrew R. Morris (added 6/06) |
| Voltage clamp circuits for ultra-low-voltage apps - Today's electronic systems often ... made to simulate a low-power Zener shunt regulator, using two parallel- .... The precise, ultra-low gate threshold voltage is used to control the sharp, fast ...
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| Voltage Controlled Panner - This circuit is used to convert a mono audio signal into a stereo signal that can be panned between the left and right channel by a 0-10V control signal, it is intended for analog synthesizer systems….(electronic design added 6/07) |
| Volume Control - A volume control using a linear pot that is much better than most log pots (added 4/02) |
| Volume Control - Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination. Here it is for 0.3 second period.….(circuit design added 08/08) |
| Volume Control - Fair Warning - Annoying Popup 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) |
| Volume Control (Aaron Cake) - based on DS1669 Digital Pot IC (added 8/03) |
| Volume Control has Log Taper - 04/11/02 - EDN-Design Ideas: potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw: a nonlogarithmic step increment. To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper.....(design idea added 12/04) |
| Volume unit meter spans 60 dB dynamic range - 11/10/05 - EDN-Design Ideas: Comparator monitors difference between input amplitude and peak-detected output.....(design idea added 10/06) |
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