Wiring & diagram Info: audio

Showing posts with label audio. Show all posts

Showing posts with label audio. Show all posts

Thursday, November 20, 2014

3 Channel Audio Mixer Circuit

Although the modular Portable Mixer architecture accessible on these web pages has become a hit for abounding amateurs, some correspondents appropriate a abundant simpler device, mainly for bond address signals.

This architecture should fulfil their needs, featuring three inputs with switchable high/low acuteness and abnormal level-control circuits, accouterment aerial afflict margins and low-noise figures, proportional to gain-level settings. Low accepted burning due to a simple, five-transistor circuitry, allows the Mini Mixer to be powered by a accepted 9V PP3 array for abounding hours.

Monday, November 17, 2014

10W Audio Amplifier with Bass boost

This Audio Amplifier design is based on the audio amplifier 18 watts, and was developed primarily to meet the requests of correspondents unable to locate the chip TLE2141C. It uses the NE5532 Dual IC wide, but obviously, its power output will be written in the 9.5 - 11.5W range, as the supply rails can not exceed ± 18V.

As amplifiers of this type are often used to drive small loudspeaker cabinets, the bass frequency range is rather sacrificed. Therefore, a Bass Boost control was inserted in the amplifier feedback loop, in order to overcome this problem, without loss of quality. The low elevation curve can reach a maximum of 16.4 dB @ 50Hz. In any case, even when the bass control is turned fully counterclockwise, the amplifiers frequency response curve shows a gentle rise: 0.8 dB at 400 Hz, 4.7 dB at 100 Hz and 6 dB at 50 Hz (referred to 1 kHz).

Friday, November 14, 2014

100W AUDIO AMPLIFIER USING TDA7294

TDA7294 is an integrated, monolithic, Class AB audio amplifier designed specifically for Hi-Fi applications. The IC has a DMOS output stage and can deliver 100W RMS into an 8Ohm speaker at +/-38V dual supply. The TDA7294 has low noise, low distortion, good ripple rejection and can be operated from a wide range of supply voltages. The IC has built in short circuit protection and thermal shutdown circuitries. The IC is available in multiwatt 15V and multiwatt 15H packages.

Description

In the circuit TDA7294 is configured to provide 100W output power into an 8Ohm loudspeaker at +/- 38V supply. C8 is the input coupling capacitor and the input is applied to the non-inverting input (Pin3) of the IC. C3 and C9 are power supply filter capacitors while C10 and C4 are bypass capacitors. C2 is the bootstrap capacitor. RC network comprising of R1 and C1 improves the high frequency stability of the amplifier and also prevents oscillations. R2 and C6 sets the mute time constant while R3 and C5 sets the standby time constant. S1 and the mute switch and S2 are the standby switch. R5 is the input resistance and the amplifiers input impedance has a direct relationship to its value. R4 and R6 is used for setting type closed loop gain and with the used value, gain is 30dB. C2 is a feedback capacitor and it also provides DC decoupling.

Circuit Diagram

Notes

The supply voltage range is +/- 10V to =/-40V DC.
Heat sink is required and its thermal resistance should be around 0.038 degree Celsius/Watt.
Use an 8 Ohm 150W speaker as the load.
For 100W output the supply voltage must be +/-38VDC.
The power supply must be well filtered and free of ripples.
If ripples are present in the power supply it may cause oscillations.
VM = 1.5V is the mute ON threshold and VM=3.5V is the mute OFF threshold.
VSTBY = 1.5V is the standby on threshold and VSTBY = 3.5V is the standby OFF threshold.
Typical input resistance of TDA7294 is 100KiloOhm.
Frequency response is 20Hz to 20KHz.
145 degree Celsius is the threshold for thermal shutdown. Slew rate of TDA7294 is 10V/microsecond and the open loop voltage gain is 80 dB.
Quiescent current of TDA7294 is approximately 30mA and its maximum value is 65mA.

Thursday, November 13, 2014

Bass and Treble Controller Audio Equalizer Circuit

An audio equalizer circuit is used to adjust the frequency response of an audio signal. This is a simple equalizer circuit for controlling the bass and treble (tone) of an audio amplifier. For use this equalizer circuit in amplifier, equalizers output should be given in the input of amplifier. So that the main input audio signal’s bass and treble could be controllable before the amplify section.

Circuit Diagram of Bass & Treble Controller- Audio Equalizer:

Audio

Fig: Audio equalizer circuit for Bass, Treble control

As shown here the bass and treble controller circuit has two variable resistor(VR1 & VR2) to control the bass and treble. VR1 for Bass Control and VR2 for Treble Control.

This Bass and Treble controller circuit needed a 12Volt power supply. I would have designed it in that way because 12V is used in most of the audio amplifier circuit. and since equalizer circuit is used with audio amplifier, so therenoextrapowersupplywillrequiredforthisEqualizer. This audio equalizer circuit is very easy to build and has a very good quality.

Wednesday, November 12, 2014

Simple Audio Peak Detector

This audio peak detector allows a pair of stereo channels to be monitored on a sin-gle LED. Identical circuitry is used in the left and right channels. Use is made of the switch-ing levels of Schmitt trigger NAND gates inside the familiar 4093 IC. The threshold level for gate IC1.A (IC1.B) is set with the aid of preset P1, which supplies a high-impedance bias level via R2 (R1).

Circuit diagram :

Simple Audio Peak Detector Circuit Diagram

When, owing to the instantaneous level of the audio signal superimposed on the bias voltage by C3 (C2), the dc level at pins 1 and 2 (5 and 6) of the Schmitt trigger gate drops below a certain level, the output of IC1.A (IC1.B) will go High. This level is copied to the input of IC1.C via D2 (D1) and due to the inverting action of IC1.C, LED D3 will light. Network R3-C1 provides some delay to enable very short audio peaks to be reliably indicated. Initially turn the wiper of P1 to the +12 V extreme — LED D3 should remain out.

Then apply ‘line’ level audio to K1 and K3, preferably music with lots of peaks (for example, drum ‘n bass). Carefully adjust P1 until the peaks in the music are indicated by D3. The circuit has double RCA connectors for the left and right channels to obviate the use of those rare and expensive audio splitter (‘Y’) cables.

Saturday, November 8, 2014

Audio Pre Amplifier

Simple Audio Pre-Amplifier This simple circuit provides good gain to too audio singnals .Use it in main of an RF oscillators to make an RF transmitter that is very sensitive to sound

Monday, October 13, 2014

Audio Detector Circuit

Audio Detector Circuit

This electronic detector circuit is to do audio detection. The circuit is for detecting one of those 3.6khz (approx) beepers from Radio Shack. The component used is a single IC (LM324 quad op amp) and a handful of parts.

Notes:

The capacitor and resistor on the output of the peak detector are selected to give a reasonable decay time. I.e. so a single pulse doesnt stretch out and be miss-interpreted as an audio signal. I think I sample the output at 100ms intervals and signal a valid sound if three consecutive samples are true.
The only critical parts are the trimmer, capacitors and the 560 ohm resistor in the band pass filter. The diode is not critical: any small diode will do fine.
The trimmer is used to set the center frequency. I just run the beeper and adjust for the strongest output signal.
It uses a condenser mic, surplus. Probably any computer microphone will do. The 4.7K resistor is a typical load for those things.

Authorized by: Larry Barello, See more: Pressure Monitoring.

Thursday, September 18, 2014

TDA7265 Audio Amplifier 2x25W

TDA7265 description:
     The TDA7265 is class AB dual Audio Amplifier assembled in the multi watt package specially designed for high quality sounds application as Hi-Fi music centers and stereo TV sets
TDA7265 features:

    WIDE SUPPLY VOLTAGE RANGE (UP TO±25V ABS MAX.)
    SPLIT SUPPLY
    HIGH OUTPUT POWER 25 + 25W @ THD =10%, RL = 8Ω, VS = +20V
    NO POP AT TURN-ON/OFF
    MUTE (POP FREE)
    STAND-BY FEATURE (LOW Iq)
    SHORT CIRCUIT PROTECTION
    THERMAL OVERLOAD PROTECTION

TDA7265 amplifier circuit:

TDA7265 amplifier circuit

TDA7265 pcb

Sunday, September 14, 2014

Sensitive Audio Power Meter Circuit diagram

Sensitive Audio Power Meter Circuit diagram: As a follow-up to the simple audio power meter described in [1], the author has developed a more sensitive version. In practice, you rarely use more than 1 watt of audio power in a normal living-room environment. The only time most people use more is at a party when they want to show how loud their stereo system is, in which case peaks of more than 10 W are not uncommon. With this schema, the dual LED starts to light up green at around 0.1 watt into 8 ohms (0.2 watt into 4 ohms). Naturally, this depends on the specific type of LED that is used.

Sensitive Audio Power Meter Circuit diagram:

Sensitive Audio Power Meter Circuit Diagram

Here it is essential to use a low current type. The capacitor is first charged via D1 and then discharged via the green LED. This voltage-doubler effect increases the sensitivity of the schema. Above a level of 1 watt, the transistor limits the current through the green LED and the red LED con ducts enough to produce an orange hue.The red colour predominates above 5 watts. Of course, you can also use two separate ‘normal’ LEDs. However, this arrangement cannot generate an orange hue. For any testing that may be necessary, you should use generator with a DC-coupled output. If there is a capacitor in the output path, it can cause misleading results.

Reference: Simple Audio Power Meter, Elektor July & August 2008.

Author : Michiel Ter Burg Streampowers

Saturday, September 13, 2014

15W Audio Amplifier with STK055

15W

Here the schematic diagram of 15W audio amplifier, built based on single power chip STK055 from Sanyo.The STK055 is old power amplifier chip which still available on the market because of the ease of its usage and the performance is good. This chip requires heatsink to be mounted on its body.

Technical details:

Maximum power supply: ± 28V
Recommended supply voltage: ± 20V
Power output: 15W
RL: 8 Ohm
TDH: 0.3%
Rin: 52K
Gain: 26.4 dB
Noise: 0.3mV

Wednesday, September 10, 2014

60W Power Audio Amplifier with 2N3055

This schema is simple and inexpensive:

60W

This is a class B amplifier, this means, that a current must flow through the end transistors, even if there is no signal on the input. This current can be regulated with the 500Ω trimmer resistor. As this current incrases, the sound of the amplifier gets better, but the end transistors are more heating. But if this current decrases, the transistors are not heating so much, but the sound gets worse.

you can download the document version here

10 W Audio Amplifier Circuit Diagram

This circuit is a general-purpose 10-W audio amplifier for moderate-power PA or modulator use in an AM transmitter. With higher voltages and a change in bias resistors, up to 30 W can be obtained. The Output Stage Amplifier using transistor 2N3055 and MJE2055.

10 W Audio Amplifier Circuit Diagram

Saturday, September 6, 2014

3 Channels Audio Splitter Amplifier Wiring diagram Schematic using TL084

This is the schematic diagram of 3 channels audio splitter amplifier schema which built using op-amp IC TL084. The 3 channels amplifier output distribution applies a single TL084.

3 Channels Audio Splitter Amplifier Circuit Diagram

3 channels audio splitter amplifier circuit diagram

The very first step is to capacitive coupling having a p. 1.0 ~ electrolytic capacitor. The entries are railways Vee Y2 or 4.5 V. This enables working with an individual 9V power source. A voltage gain of 10 (1 M?/100 Kohm) is obtained in the first stage, as well as the other three floors are connected as a unity gain voltage followers. Every single output stage drives independently through an amplifier output 50 pF capacitor towards the resistance of 5.1 k ohm load. The response range is flat from 10 Hz to 30 kHz.

Low Power Audio Amplifier Circuit with IC TDA2824S

This is stereo audio amplifier with based on ICTDA2824S , Minimum voltage require 3 volts and maximum voltage 17 volts . Maximum output power 2 X 2 Watt , its low power amplifier. Output impedance 4 ohm. see schematic audio below :

Friday, September 5, 2014

Car audio and stereo how to install satellite radio systems

Satellite radio represents the newest and best technology for receiving music signals. This simple guide will enable you to install a satellite radio receiver in your car.

There are several different types of satellite radio receivers available. This guide will cover the basics of installing plug and play tuners as well as hardwired in-car tuners. Plug and play tuners are units that mount on the dashboard of the vehicle. They typically come with one or more devices to connect the tuner to the stereo, as well as a cigarette lighter adapter and a mounting bracket. In-car tuners are usually rectangular boxes that will be controlled by the head unit and powered by the car power supply.

Plug and Play Tuners

Step 1- Install the mounting bracket. Select a location that does not obstruct the driver’s view of the console or the road. The bracket should also be placed within arm’s length of the driver’s seat. To mount the bracket to the dash, first clean off the spot with alcohol wipes. Wait for this to dry, then remove the adhesive backing from the bracket and press firmly onto the dash for at least 30 seconds. Wait at least an hour before applying any weight to the bracket. The bracket can then be reinforced with screws or bolts if needed. Once the bracket is in place, slide the radio unit in place.

Step 2- Connect the unit to the stereo. If your stereo has an auxiliary in port, use the supplied adaptor to connect the unit directly to this port. If you plan on using a cassette adapter, connection is as simple as putting the cassette into the stereo. If you choose to use an FM modulator, set both the modulator and the head unit to the same frequency.

Step 3- Connect the antenna. If the antenna has an adhesive backing, use the same process as mounting the bracket. If the antenna is magnetic, simply place it on the roof of the car. The optimal placement for the antenna is the highest point on the car. Run the antenna wires through one of the door seals, but make sure the cord will not be damaged by the normal operation of the door. Once the cord is inside the car, run it beneath the carpet all the way up to the satellite tuner and plug it in.

Step 4- Connect the unit to a power source. This is usually done by way of a cigarette lighter adapter. If you plan on hardwiring the power line, use crimps and appropriate fuses to make a good connection to a 12v switched power line.

Step 5- Activate the satellite radio. This can usually be done online or over the phone. You will need the activation code for the radio. Once the radio is activated, it will function normally.

Head unit controlled Satellite radio

Step 1- Mount the tuner box. Select a location that will be out-of the way, and easy accessible for wiring purposes. This is usually either in the trunk or under one of the rear seats. Use the included hardware to bolt the box into something solid. Be wary of puncturing floor panels, and be aware of what you are drilling into. Do not place the unit beneath any carpeting.

Step 2- Wire the power lines for the box. Before you do this, disconnect the negative terminal from the car battery. Find a 12v line, either switched or non-switched, that you are able to tap into. It is best to use either the head unit power source or the cigarette lighter power source. To split the line, clip the existing cable at the desired location and crimp the three lines back together. Fuse the line before and after the split. Run the power cable beneath the carpet back to the tuner box and plug it in.

Step 3- Hook the tuner box to the stereo. The unit should come with two cables: an RCA patch cable and a bus controller cable. Plug both of these cables into their respective ports in the tuner box and run them up to the head unit. Plug them into the ports in the back of the head unit.

Step 4- Mount the antenna. If the antenna has an adhesive mount, first clean the area you intend to mount it on, then remove the adhesive backing and press firmly for at least 30 seconds. In the case of a magnetic mount antenna simply place it where you want it. The best mounting location is the highest point on the car. Be sure the antenna is not obstructed by any part of the car. Run the wires into the car through a door seal, then underneath the carpet until you reach the tuner box. Plug both the ground (terra) and satellite antenna cables into the unit.

Step 5- Activate the unit by following the instructions provided. You will need the activation or identification numbers for the unit, so write these down before you call.

Cell Phone Controlled Audio Video Mute Switch

The schema of the cell phone-controlled audio/video mute switch . This cell-phone-controlled audio/ video mute switch is highly useful in automobiles. The schema automatically disconnects power supply to the audio/video system whenever the mobile handset is lifted off the holder for making or receiving a call. You can use any readily available cell-phone holder with some mi-nor alterations or fabricate it yourself as shown in Fig. 1.

Proposed

Fig. 1: Proposed cell-phone holder

The schema is wired around IC LM555 (IC1), the CMOS version of timer NE555, as shown in Fig. 2. IC1 is used as a medium current line driver with either an inverting or non-inverting output. It can sink (or source) current of up to 50 mA only, so take care while handling it. The audio/video system is connected to the schema via normally opened (N/O) contacts of the relay.

schema

Fig. 2: The schema of the cell phone-controlled audio/video mute switch

When the cell phone is in its holder, LDR1 does not receive any light from white LED1 and its resistance is high. As a result, the voltage at pin 2 of IC1 re-mains high to provide a low output at pin 3. The low output of IC1 activates relay RL1 and the audio/video system gets power supply via its N/O contacts. LED3 glows to indicate that the audio/video system is ‘on.’ When the handset is taken off the holder, light rays from LED1 fall on LDR1 and its resistance decreases. As a result, the voltage at pin 2 of IC1 de-creases to provide a high output at its pin 3. The high output of IC1 deactivates relay RL1 and the audio/video system does not get power supply. LED2 glows to indicate that the audio/video system is ‘off.’ Preset VR1 is used to control the sensitivity of the schema. Zener diode ZD1 is used for protecting white LED1 from the higher voltage. The schema works off a 12V car battery. Switch S1 can be used to manually switch on/off the audio/video system.

Author : T.K. Hareendran - Copyright: Electronics For You

LM1895N Audio Amplifier 1W

With 3-V to 9-V supplies, this amplifier can provide from 100-mW to 1-W output into a 4 and bandwidth is approximately 20 kHz @ 3 dB. This circuit is useful for low-power and battery applications.Drain is 80 mA @ 3 V or 270 mA @ 9 V at maximum signal conditions.

Wednesday, September 3, 2014

Mic Audio Amplifier Wiring diagram Schematic

Mic Audio Amplifier Circuit Diagram.The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts. It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier.

Resistor R1 provides the necessary bias for the condenser mic while preset VR1 functions as gain control for varying its gain. In order to increase the audio power, the low-level audio output from the preamplifier stage is coupled via coupling capacitor C7 to the audio power amplifier built around BEL1895 IC.BEL1895 is a monolithic audio power amplifier IC designed specifically for sensitive AM radio applications that delivers 1 watt into 4 ohms at 6V power supply voltage.

It exhibits low distortion and noise and operates over 3V-9V supply voltage, which makes it ideal for battery operation. A turn-on pop reduction schema prevents thud when the power supply is switched on. Coupling capacitor C7 determines low-frequency response of the amplifier. Capacitor C9 acts as the ripple-rejection filter.
.

Circuit Diagram :
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Condenser Mic Audio Amplifier Circuit Diagram

Capacitor C13 couples the output available at pin 1 to the loudspeaker. R15-C13 combination acts as the damping schema for output oscillations. Capacitor C12 provides the boot strapping function. This schema is suitable for low-power HAM radio transmitters to supply the necessary audio power for modulation. With simple modifications it can also be used in intercom diagram.

Author: D. Prabakaran - Copyright: Electronics For You Mag

Tuesday, September 2, 2014

Schematic Audio Power Amplifier with IC AN7110 AN7130

Description Schematic :

Minimum Voltage for this Circuit is 6 Volt , and Maximum voltage is 18 Volt . To recomended circuit working use voltage 12 Volt. Its not So much and less , its good. Output speaker is Mono with power 1,2 watt and Impedance 8 Ohm. IC equal with AN7130.

See schematic circuit audio power amplifier AN7110 or AN7111 :

Click to view Enlarge

Saturday, August 30, 2014

70V 60W DMOS AUDIO AMPLIFIER WITH MUTE ST BY

Features

MULTIPOWER BCD TECHNOLOGY
VERY HIGH OPERATING VOLTAGE RANGE (±35V)
DMOS POWER STAGE
HIGH OUTPUT POWER (UP TO 60W MUSIC POWER)
MUTING/STAND-BY FUNCTIONS
NO SWITCH ON/OFF NOISE
NO BOUCHEROT CELLS
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN

Circuit Diagram

Circuit Diagram for 70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

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