Wednesday, June 24, 2009
Power Amplifier 45W with HEXFET IRF9540,IRF540
A ideal solution for the make a good, low cost power amplifier. It�s a ideal solution for the creation a system of home cinema. The preamplifier and the driver support in a operational amplifier [IC1]. The voltage fall in resistors R5 and TR2/R6, drive the output FET’s gates and is proportional with the input signal level. Transistors Q1-2 function as voltage stabilizers in the supply lines, but ensure also the essential voltage fall, because the IC1 it should not they are supplied with voltage bigger ± 18V. …
Part List
R1=47Kohm C1-2-6-7=100nF 100V MKT Q5-6=IRF9540
R2-12=1Kohm C3-4=22uF 25V Q7-8=IRF540
R3-4=3.3Kohm C5=220pF styroflex TR1=5Kohm trimmer multiturn
R5=1.2Kohm C8-9=4700uF 63V TR2=1Kohm trimmer multiturn
R6=[1.2Kohm] 820ohm *See text C10=1uF 100V MKT F1-2=fuse 3A
R7=270ohm D1-2=15V 0.5W zener J1=2pin connector 2.54mm step
R8=220ohm IC1=LF411orAD711or LF351 J2=5pin connector 5mm step
R9=27Kohm Q1=BC550C
R10-11=22Kohm Q2=BC560C All Resistors 1/4W 1% metal film
R13-14-15-16=150ohm Q3-4=BC547B
Read More Source:
http://users.otenet.gr/~athsam
Thank you.
170 Watt Class D Audio Power Amplifier with LM4651 and LM4652
DescriptionThe IC combination of the LM4651 driver and the LM4652 power MOSFET provides a high efficiency, Class D Amplifier solution
This circuit is ideal for car booster amplifier, active speaker/subwofer, home theater, or PC’s multimedia sound system. The maximum efficiency 85% is obtained at 125W power output condition। The total harmonics distortion is 10% at full power output of 170W। For better fidelity, the THD at 10W is only 0।3% for 10-500Hz input signal driving 4 ohm speaker
This circuit is ideal for car booster amplifier, active speaker/subwofer, home theater, or PC’s multimedia sound system. The maximum efficiency 85% is obtained at 125W power output condition। The total harmonics distortion is 10% at full power output of 170W। For better fidelity, the THD at 10W is only 0।3% for 10-500Hz input signal driving 4 ohm speaker
- Conventional pulse width modulation
- Turn-on soft start and under voltage lockout
- 50kHZ to 200kHz switching frequency range
- Externally controllable switching frequency
- Integrated error amp and feedback amp
- 15 Lead TO220 isolated package
- Self checking protection diagnostic
- Over modulation protection (soft clipping)
- Short circuit current limiting and thermal shutdown protection.
The power supply voltage cannot exceed (+-) 22V, and also, the output stage will be turned off when the supply voltage drops under 10.5V to prevent under-voltage failure both for the circuit and for the battery (if implemented for car audio application).
Tuesday, June 23, 2009
2 x 25 W class-D power amplifier with TDA8922.
General descriptionShowThe TDA8922 is a high efficiency class-D audio power amplifier with very low dissipation. The typical output power is 2 X 25 W.
The device is available in the HSOP24 power package with a small internal heatsink and in the DBS23P through-hole power package। Depending on the supply voltage and load conditions, a very small or even no external heatsink is required. The amplifier operates over a wide supply voltage range from +-12.5 to +-30 V and consumes a very low quiescent current.
FeaturesShowHigh efficiency (~90pct)
Operating supply voltage from +-12.5 to +-30 V
Very low quiescent current
Low distortion
Usable as a stereo Single-Ended (SE) amplifier or as a mono amplifier in Bridge-Tied Load (BTL) Fixed gain of 30 dB in Single-Ended (SE) and 36 dB in Bridge-Tied Load (BTL)
High output power
Good ripple rejection
Internal switching frequency can be overruled by an external clock
No switch-on or switch-off plop noise
Short-circuit proof across load and to supply lines
Electrostatic discharge protection
Thermally protected
Sunday, June 14, 2009
Tuesday, June 9, 2009
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