Musical Bell with Touch Switch

Musical Bell with Touch Switch

Musical Bell with Touch Switch. Time delay can be adjusted by modifying the values of resistor R2 and capacitor C1. Three silicon diodes joined in series between pin 2 of UM66 IC and positive 5-volt rail maintain voltage carried out to pin 2 of UM66 less than 3.2 volts considering the decrease of about 1.8 volts across them.

This schematic diagram come from circuit: Musical Bell with Touch Switch.
Go to that page to read the explanation about above circuit design.

In the electrical sector, a schematic diagram is usually used to describe the design or model of equipment. Schematic diagrams are usually utilized for the maintenance and repair of electronic and electromechanical devices / units. Original schematics were made by hand, using standardized templates or pre-printed adhesive symbols, but nowadays Electrical CAD computer software is often used.

In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More lately, using the progress of computer system technology, other representations were introduced and specialized computer languages were developed, because with the explosive development of the complexity of electronic circuits, classic schematics are getting less practical. As an example, hardware description languages are indispensable for contemporary digital circuit design.

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