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YD7388 - Four-channel 25W (BTL) audio amplifier
CD3313EO - four-channel audio processor
LM36274 - Four-Channel LCD Backlight Driver
L293D - PUSH-PULL FOUR CHANNEL DRIVER
A-5461AS - FOUR DIGIT SUPER RED DISPLAY
A-5461BS - FOUR DIGIT SUPER RED DISPLAY
PT2313 - three-input four output digital control channel audio processor
CD3313 - four-channel audio processor
AP3064 - FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER
LA4743B - 45 W Four-Channel (Bridge Circuit) Power Amplifier
GM-X924 - BRIDGEABL FOUR-CHANNEL POWER AMPLIFIER SERVICE MANUAL
ALC3261 - FOUR CHANNEL I2S/PCM AUDIO CODEC
ES7210 - High Performance Four Channels Audio ADC
ULF-3492AG - Four Digit Display
LM348 - Four UA741 quad bipolar operational amplifiers
A-5461BSR - FOUR DIGIT SUPER RED DISPLAY
PT2311 - Four-channel Digital Control Audio Processor Utilizing CMOS Technology
L293DD - PUSH-PULL FOUR CHANNEL DRIVER
EM60000 - Stereo Four Channels 8-Bit Based Sound Processor
CA3052 - Four Independent AC Amplifiers