Scale LED Indicator with A277D Integrated Circuits

Scale LED Indicator with A277D Integrated Circuits LED indicators are widely used in consumer and professional radio equipment. Circuit design of the indicators is based on the process of light indication of input and output signals. Change in signal level results in change of LED array length. For example, check Indicators of power amplifier output signal are high cost effective since each moment of signal change is indicated by one LED only. As a result each equipment unit is digitally switched over when a signal of a sound source is changed. Signal power LED indicator with A277D integrated circuits is one of the scale indicators. Its scale consists of 12 LEDs and 12 discrete levels of input signal respectively. The circuit is based on A277D integrated circuit. The circuit is produced in Russia and similar to К1003PP1. The device is powered by 9V -- 12V constant voltage. Useful current is about 20mA. Due to its low current consumption, high input resistance and high sensitivity of the device, it may be used as an indicator in different electronic equipment.