Using the LM3914 this unusual digital clock uses a Bargraph LED indicator. The LEDs are the segments of a 7-segment display. We found it in February 1980 Radio Electronics magazine.
The figure shows how to obtain a capacitance digitally with 4066 switches. The table shows the...
Scratch is the scratching noise that occurs mainly with old records. This high frequency noise is...
The sensor of this circuit can be any phototransistor and the SCR can be the TIC106. The circuit and...