Showing posts with label 25. Show all posts
Showing posts with label 25. Show all posts
Saturday, September 13, 2014
2 x 25 W Power amplifier for car radio TDA7376B
Features
High output power capability:
2 x 40 W max./ 4
2 x 35 W/4 EIAJ
2 x 25 W/4 (14.4 V, 1 kHz, 10 %)
2 x 25 W/ 2 (14.4 V, 1 kHz, 10 %)
Differential inputs
Minimum external components count
Internally fixed gain (26 db)
Mute function (cmos compatible)
Automute at minimum supply voltage detection
Standby function
No audible pop during mute and standby operations
Clipping detector with programmable distortion threshold
short circuit (out to ground, out to supply voltage, across the load)
overrating chip temperature with soft thermal limiter
load dump voltage
fortuitous open ground
loudspeaker dc current
ESD
Description
High output power capability:
2 x 40 W max./ 4
2 x 35 W/4 EIAJ
2 x 25 W/4 (14.4 V, 1 kHz, 10 %)
2 x 25 W/ 2 (14.4 V, 1 kHz, 10 %)
Differential inputs
Minimum external components count
Internally fixed gain (26 db)
Mute function (cmos compatible)
Automute at minimum supply voltage detection
Standby function
No audible pop during mute and standby operations
Clipping detector with programmable distortion threshold
short circuit (out to ground, out to supply voltage, across the load)
overrating chip temperature with soft thermal limiter
load dump voltage
fortuitous open ground
loudspeaker dc current
ESD
Description
The TDA7376B is a new technology dual bridge audio amplifier in Multiwatt 15 package designed for car radio applications. Thanks to the fully complementary PNP/NPN output stage configuration the TDA7376B delivers a rail-to-rail voltage swing with no need of bootstrap capacitors. Differential input pairs, that will accept either single ended or differential input signals, guarantee high noise immunity making the device suitable for both car radio and car boosters applications.The audio mute control, that attenuates the output signal of the audio amplifiers, suppresses pop On - Off transients and cuts any noises coming from previous stages. The standby control, that de-biases the amplifiers, reduces the cost of the power switch. The on-board programmable distortion detector allows compression facility whenever the amplifier is over driven, so limiting the distortion at any levels inside the presettable range.
Circuit diagram:
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| 2 x 35 W Power amplifier for car radio |
PCB layout
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| pcb layout for TDA7376B Power amplifier for car radio |
Wednesday, September 3, 2014
harman kardon DVD 25 SMPS SCHEMATIC Wiring diagram Schematic NDV8501 NDV8601
harman/kardon NDV8501 / NDV8601 Based Progressive Scan DVD Player
Model Number: DVD25
Compactable with CD as well as DVD with Region Code ‘0’ or ‘2’
SMPS SCHEMATIC [Click on the pictures to Zoom In]
To reset the unit
* Set the unit in SY-BY.
* Push “Clear” button on the remote control, until the unit Power ON. [This will not change the Zone]
To read the software version.
* Set the unit in ON mode.
* Push Set-up button on the remote control.
* Push ‘1211’, and then a new menu showing the data of the unit.
To Exit, push Set-up.
Sunday, August 24, 2014
25 Watt Audio Amplifier Circuits Wiring diagram
25 Watt Audio Amplifier Circuits Diagram
Parts:
R1,R4_________47K1/4W ResistorsR2____________4K71/4W ResistorR3____________1K51/4W ResistorR5__________390R1/4W Resistor
R6__________470R1/4W Resistor
R7___________33K1/4W Resistor
R8__________150K1/4W Resistor
R9___________15K 1/4W Resistor
R10__________27R1/4W Resistor
R11_________500R1/2W Trimmer CermetR12,R13,R16__10R1/4W ResistorsR14,R15_____220R1/4W ResistorsR17___________8R22W Resistor
R18____________R224W Resistor (wirewound)C1___________470nF63V Polyester CapacitorC2___________330pF63V Polystyrene CapacitorC3,C5________470µF63V Electrolytic CapacitorsC4,C6,C8,C11_100nF63V Polyester CapacitorsC7___________100µF25V Electrolytic CapacitorC9____________10pF63V Polystyrene CapacitorC10____________1µF63V Polyester CapacitorQ1-Q5______BC560C45V 100mA Low noise High gain PNP Transistors
Q6_________BD14080V 1.5A PNP Transistor
Q7_________BD13980V 1.5A NPN Transistor
Q8_________IRF530100V 14A N-Channel Hexfet Transistor
Q9_________IRF9530 100V 12A P-Channel Hexfet TransistorPower supply schema diagram
Parts:
R1____________3K31/2W Resistor C1___________10nF 1000V Polyester CapacitorC2,C3______4700µF50V Electrolytic CapacitorsC4,C5_______100nF63V Polyester Capacitors D1__________200V 8A Diode bridgeD2__________5mm. Red LED F1,F2_______3.15A Fuses with sockets T1__________220V Primary, 25 + 25V Secondary 120VA Mains transformerPL1_________Male Mains plug SW1_________SPST Mains switchNotes:
- Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need.
- Q6 & Q7 must have a small U-shaped heatsink.
- Q8 & Q9 must be mounted on heatsink.
- Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter connected in series to Q8 Drain) with no input signal.
- A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of R1, R4, R9, C3 to C8. Connect C11 to output ground. Then connect separately the input and output grounds to power supply ground.
- An earlier prototype of this amplifier was recently inspected and tested again after 15 years of use.
Technical data:
Output power:
well in excess of 25 Watt RMS @ 8 Ohm (1KHz sine wave)
Sensitivity:
200mV input for 25W output
Frequency response:
30Hz to 20KHz-1dB
Total harmonic distortion @ 1KHz:
0.1W 0.014% 1W 0.006% 10W 0.006% 20W0.007% 25W 0.01%
Total harmonic distortion @10KHz:
0.1W 0.024% 1W 0.016% 10W 0.02% 20W0.045% 25W 0.07%
Unconditionally stable on capacitive loads
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