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In this video, I explain some theories behind a low pass active filter circuit, then I built a simple active low pass filter using the LM358 opamp. I tested the filter's behavior using the Siglent SDG1025 waveform generator and the Siglent SDS2102X Plus oscilloscope.

hi! how to do the countdown timer from 555 to bcd to decoder? also the 7-segment display. If possible, let me have the schematic diagram. thank you.