This stereo balance indicator circuit diagram is designed using few common external components .The schematic circuit is very simple to build and will provide an visual indication with LEDs for left , right and center balance . Outputs from each channel are fed to the two inputs of IC1 connected as a differential amplifier . Output of the IC1 is connected to the noninverting inputs of the IC2 and IC3 . If the outputs of the IC1 approaches the supply rail , the outputs of the IC2 and IC3 will go high illuminating the LED 3 , this will show that the right channel is dominating .
This USB to Serial RS232 adapter is very useful in many situations we need to connect a device with RS232 to a computer without RS232 port , but with USB port .
Using FT232BM chip manufactured by Future Technology Devices International we can make a very simple USB to Serial RS232 adapter using few external components .