{"id":15721,"date":"2026-01-06T19:54:19","date_gmt":"2026-01-06T11:54:19","guid":{"rendered":"http:\/\/www.erun-tech.com\/?post_type=dt_portfolio&p=15721"},"modified":"2026-01-06T19:54:19","modified_gmt":"2026-01-06T11:54:19","slug":"dianzigongyijinjiedianzixianludejichuzhishi","status":"publish","type":"dt_portfolio","link":"http:\/\/www.erun-tech.com\/en\/project\/dianzigongyijinjiedianzixianludejichuzhishi","title":{"rendered":"Advanced Electronics Techniques: Fundamentals of Electronic Circuits"},"content":{"rendered":"
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Advanced Electronics Techniques: Fundamentals of Electronic Circuits<\/h1>\n
Circuit Analysis \u00b7 Practical Application of Voltage Regulation and Charging Circuits<\/div>\n<\/div>\n
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I. Simple Electronic Circuits<\/h2>\n
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1. 7805 Three-Terminal Voltage Regulator Integrated Circuit<\/div>\n
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The 7805 is a commonly used three-terminal voltage regulator integrated circuit, as shown in Figure 14-2. As long as components are selected according to the specified values and soldered correctly, it outputs a stable 5 V voltage without requiring adjustment. The components labeled $C_1$ and $C_2$ in the diagram are both power supply filter capacitors. The $C_1$ has a voltage rating of 10 V, while the $C_2$ requires a voltage rating of \u226516 V. This regulated power supply provides a fixed output voltage of 5 V with a maximum output current of 1.5 A.<\/p>\n

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\"859872047cd63c1c0fb0cb68b9cfd4c1\"<\/p>\n

Figure 14-2 7805 Three-Terminal Voltage Regulator Integrated Circuit<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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2. Battery Charging Circuit Analysis<\/div>\n
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The battery charging circuit is shown in Figure 14-3. Control selector switch S regulates the charging current, offering two positions: 100 mA and 50 mA. The brightness of the light-emitting diode (LED) indicates the position of switch S and the magnitude of the charging current. $R_5$ serves as the LED's current-limiting resistor, restricting the current flowing through the LED to a specified value.<\/p>\n

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Analysis of Working Principle:<\/strong><\/p>\n

When switch S is positioned at the 100 mA setting shown in Figure 14-3, the base voltage of transistor T stabilizes at 6V, with its emitter voltage approximately 5.4V. Dividing this voltage by the sum of resistors $R_4$ and $R_2$ (The current through the LED in series with $R_5$ is approximately 5 mA and is neglected in this estimation), yielding a current of approximately 100 mA. Thus, the battery charging current is 100 mA. Similarly, if switch S is set to the 50 mA position, the battery charging current is 50 mA.<\/p>\n<\/div>\n

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\"ec0414ab7886bd08a5d718b88b954f84\"<\/p>\n

Figure 14-3 Battery Charging Circuit<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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II. Finished Product Requirements<\/h2>\n
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(1) Component leads must be soldered perpendicular to the circuit board; they must not be tilted or slanted. Components should be arranged logically, neatly, and aesthetically.<\/p>\n

(2) Solder joints are smooth with appropriate solder quantity. Solder flow is clean and uniform.<\/p>\n

(3) Can implement circuit functions.<\/p>\n

(4) After completing the soldering, properly store and maintain the soldering iron.<\/p>\n

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  • <\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

    Advanced Electronics Techniques: Fundamentals of Electronic Circuits Circuit Analysis \u00b7 Practical Application of Voltage Regulation and Charging Circuits I. Simple Electronic Circuits 1. 7805 Three-Terminal Regulator...<\/p>","protected":false},"author":1,"featured_media":15724,"comment_status":"open","ping_status":"closed","template":"","dt_portfolio_category":[891],"dt_portfolio_tags":[],"class_list":["post-15721","dt_portfolio","type-dt_portfolio","status-publish","has-post-thumbnail","hentry","dt_portfolio_category-dianzidianqiyuanshicaopinggukecheng","dt_portfolio_category-891","description-off"],"_links":{"self":[{"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/dt_portfolio\/15721","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/dt_portfolio"}],"about":[{"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/types\/dt_portfolio"}],"author":[{"embeddable":true,"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/comments?post=15721"}],"version-history":[{"count":1,"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/dt_portfolio\/15721\/revisions"}],"predecessor-version":[{"id":15725,"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/dt_portfolio\/15721\/revisions\/15725"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/media\/15724"}],"wp:attachment":[{"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/media?parent=15721"}],"wp:term":[{"taxonomy":"dt_portfolio_category","embeddable":true,"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/dt_portfolio_category?post=15721"},{"taxonomy":"dt_portfolio_tags","embeddable":true,"href":"http:\/\/www.erun-tech.com\/en\/wp-json\/wp\/v2\/dt_portfolio_tags?post=15721"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}