Showing posts with label stereo. Show all posts
Showing posts with label stereo. Show all posts
Monday, January 26, 2015
Stereo Preamplifier With Bass Boost
This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing an ac voltage gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets, the bass frequency range is rather sacrificed. This circuit features also a bass-boost, in order to overcome this problem. You can use a variable resistor to set the bass-boost from 0 to a maximum of +16dB @ 30Hz. If a fixed, maximum boost value is needed, the variable resistor can be omitted and substituted by a switch.
Stereo Preamplifier With Bass Boost Circuit diagram:
P1 = 10K
P2 = 100K
R1 = 100K
R2 = 100K
R3 = 15K
R4 = 10K
R5 = 22K
R6 = 15K
R7 = 1K
R8 = 470R
C1 = 2.2uF-25v
C2 = 2.2uF-25v
C3 = 470uF-35v
C4 = 1uF-35V
C5 = 2.2uF-25v
C6 = 47nF-63v
C7 = 22uF-25v
IC1 = TL072, Opamp
SW1 = DPST Switch
Notes:
- Schematic shows left channel only, but R1, R2, R3 and C1, C2, C3 are common to both channels.
- For stereo operation P1, P2 (or SW1), R4, R5, R6, R7, R8 and C4, C5, C6, C7 must be doubled.
- Numbers in parentheses show IC1 right channel pin connections.
- A log type for P2 ensures a more linear regulation of bass-boost.
- Needing a simple boost-in boost-out operation, P2 must be omitted and SW1 added as shown in the diagram.
- For stereo operation SW1 must be a DPST type.
- Please note that, using SW1, the boost is on when the switch is open, and off when the switch is closed.
Monday, November 17, 2014
Mixer Line Mic Stereo Schematic Diagram
| R1-8-31-32=3.3K ohms | C1-4-7-9-12-17=10uF 16V | IC1=TLC274 |
| R2-7-27-30=100 ohms | C2-8=470nF 63V MKT | IC2=TLC272 |
| R3-4-9-10=1M ohms | C3-24-27-28=100nF 63V MKT | IC3=7805 |
| R5-11-21-22-23-24=10K ohms | C5-10=10pF ceramic | D1=1N4007 |
| R6-12-15-17=1K ohms | C6-11=1uF 16V | D2=LED 3mm |
| R13-14-19-20-28-29=47Kohms | C13-16-20-21=47pF | JF1-2-5-6=female jack 3.5mm stereo |
| R18-16-25-26=22K ohms | C14-15-18-19=1uF 63V MKT | JF3-4=RCA female plug |
| RV1=2X100K ohms Lin. | C22-23-25=100uF 16V | JF7=female jack 3.5mm mono |
Friday, September 12, 2014
25 25W STEREO AMPLIFIER WITH MUTE ST BY
Features
- WIDE SUPPLY VOLTAGE RANGE (UP TO 50V 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)
- FEW EXTERNAL COMPONENTS
- SHORT CIRCUIT PROTECTION
- THERMAL OVERLOAD PROTECTION
Circuit Diagram
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| 25 + 25W STEREO AMPLIFIER WITH MUTE/ST-BY |
Layout:
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| PCB layout |
TDA2822 Stereo Amplifier circuit
TDA2822 is a stereo low-power op amplifier used in the Walkman and headphones. It can output 250 milliwatts. TDA2822 is an operational amplifier ideal for low production. It is a good option as a stereo preamplifier circuits high-powered amplifier. It has two inputs and two outputs that can generate 250 milliwatts of output.power. The circuit of the amplifier IC is well established for noise-free operation. The outputs can be coupled directly to the speakers through the decoupling capacitors.
Tuesday, September 9, 2014
TDA1556Q 2 x 22 W stereo BTL differential amplifier with speaker protection
FEATURES
Few peripheral components
High output power
Low output offset voltage
Fixed gain
Loudspeaker protection (with diagnostic facility)
Differential inputs
Dynamic Distortion Detector (DDD)
High common mode input signal
Very high CMRR
Good ripple rejection
Mute/stand-by switch
Load dump protection
Short-circuit safe
Thermally protected
Reverse polarity safe
High energy handling capability at the outputs (VP = 0 V)
Electrostatic discharge protection
No switch-on/switch-off plop
Flexible leads
Low thermal resistance
GENERAL DESCRIPTION
TDA1556Q is a monolithic integrated class-B output amplifier containing two 22 Watt amplifiers in a BTL configuration. The device is contained in a 17-lead single-in-line (SIL) plastic power package. It has two differential inputs and is primarily intended for car booster applications.
Circuit Diagram:
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| Circuit diagram for TDA1556Q 2 x 22 W stereo BTL differential amplifier with speaker protection |
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.
- 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.
Head unit controlled Satellite radio
Tuesday, August 26, 2014
LM4910 Stereo Headphone Amplifier
Circuit description:
LM4910 belonging to the Boomer series of National Semiconductors is an integrated stereo amplifier primarily intended for stereo headphone applications. The IC can be operated from 3.3V ans its can deliver 0.35mW output power into a 32 ohm load. The LM4910 has very low distortion ( less than 1%) and the shutdown current is less than 1uA. This low shut down current makes it suitable for battery operated applications. The IC is so designed that there is no need of the output coupling capacitors, half supply by-pass capacitors and bootstrap capacitors. Other features of the IC are turn ON/OFF click elimination, externally programmable gain etc.
Circuit diagram:
Circuit diagram of the LM4910 stereo headphone amplifier is shown above.C1 and C2 are the input DC decoupling capacitors for the left and right input channels. R1 and R2 are the respective input resistors. R3 is the feed back resistor for left channel while R4 is the feed back resistor for the right channel. C3 is the power supply filter capacitor. The feedback resistors also sets the closed loop gain in conjunction with the corresponding input resistors.
The IC is available only in SMD packages and care must be taken while soldering.
The circuit can be powered from anything between 2.2V to 5V DC.
The load can be a 32 ohm headphone.
Absolute maximum supply voltage is 6V and anything above it will destroy the IC.
A logic low voltage at the shutdown pins shut downs the IC and a logic high voltage at the same pin activates the IC. Original aritcle sourse circuitsproject.com
Friday, August 22, 2014
BTL Stereo Amplifier TDA7052
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