Showing posts with label circuits. Show all posts
Showing posts with label circuits. Show all posts
Wednesday, June 12, 2013
ISL97672A power LED driver electronic project and circuits
Using the ISL97672A can be designed a power LED driver circuit that controls six channels of LED current for LCD backlight applications. The ISL97672A power LED driver is capable of driving LEDs from 4.5V to 26.5V, with a maximum output of 45V.
The ISL97672A power LED driver employs an adaptive boost switching architecture that allows Direct PWM dimming with linearity as low as 0.007% at 200Hz or 0.8% at 20kHz. Dimming can be as high as 30kHz.
This LED driver can compensate for non-uniformity of forward voltage drops in the LED strings. Its headroom control circuit monitors the highest LED forward voltage string for output regulation to minimize voltage headroom and power loss in a typical multi-string operation.
The IC features extensive protection functions that flag whenever a fault occurs. The protections include string-open and short-circuit detections, OVP, OTP, and an optional output short-circuit protection with a fault disconnect switch
LED drivers for direct, multiplexed videowalls, information displays circuits
Friday, May 31, 2013
Bosch Alternatorinternal Circuits
Jam S Tiger Avon Wiring A Nippon Denso Alternator.
Alternator Wiring Diagram 1978 80 Vehicles.
Chevy Truck Under Hood Wiring Diagram.
About Honda Cb400 And Cb450 Wiring Diagram And Schematics Here.
Garden Tractor Wiring Diagram Parts List Manual Parts Book.
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Alternator Wiring Diagrams 1g 2g And 3g.
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Of This Bosch Alternator S Internal Circuits Is Given Below.
Tuesday, April 9, 2013
6 12 Volt audio amplifier circuits
The above is an amplifier circuit using supply voltages from 6 volts DC to 12 Volt DC. Power output of the amplifier is quite low with only 1 Watt 8 ohm impedance. You can apply this to the audio signal amplifiers that require strengthening are not so large as in the pocket radio.Part List :
R1 = 100K
R2 = 39R
R3 = 100R
C1 = 100nF
C2 = 100uF
C3 = 100uF
C4 = 100uF
C5 = 470uF
C6 = 100nF
C7 = 68pF
C8 = 1nF
C9 = 47uF
IC = SFC2790C
Monday, March 25, 2013
AUDIO POWER METER WITH LM3915
This VU (volume-unit) meter is capable of monitoring anddisplaying power
levels present at the speaker terminals ofan stereo audio power
amplifier.
The levels are displayed in ten discrete steps. This meter is not
designed to give an accurate display of the power levels.It is designed
to give an approximate visual indication of the audio power output of
each channel. For many situations - disco, parties - this is all which
is required: the flashing LED's add atmosphere to the situation.
LM3915. This is a monolithic Dot/Bar Display Driver IC made by National
Semiconductor. It takes an analog voltage input on pin 5 then drives 10
LED's providing a logarithmic 3dB/step analog display. When measuring
power, a 3dB increase means that the power input has doubled. As the
power doubles, an additional LED will be lit until the maximum is
reached. The display can be bar or moving dot depending on the
connection of pin 9 to the positive supply. The LED drive current is
regulated which eliminates the need for current limiting resistors.
The supply voltage can be between 3V to 25V. You can download the data sheet from the National Semiconductor website at: http://www.national.com/
The IC is suited to signals with a wide dynamic range such as audio,
power, light intensity. In many applications a bargraph meter is faster,
more rugged and has higher visibility than an analog (moving coil) or
LCD meter.
PARTS LIST
R1-----10K
R2------1K
R3-----390
R4-----2,7K
P1-----100K TRIMMER POT.
C1-----10mf 25v
D1..D10---LED red
I.C. ----LM3915
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