{"id":15726,"date":"2026-01-06T21:04:10","date_gmt":"2026-01-06T13:04:10","guid":{"rendered":"http:\/\/www.erun-tech.com\/?post_type=dt_portfolio&p=15726"},"modified":"2026-01-06T21:06:13","modified_gmt":"2026-01-06T13:06:13","slug":"15726","status":"publish","type":"dt_portfolio","link":"http:\/\/www.erun-tech.com\/en\/project\/15726","title":{"rendered":"Hands-On Project: Soldering and Assembly of a \u00b11.25~12 V Adjustable Regulated Power Supply"},"content":{"rendered":"
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Hands-On Project: Soldering and Assembly of a \u00b11.25~12 V Adjustable Regulated Power Supply<\/h1>\n
Electronic Process Training - Analog Circuit Assembly<\/div>\n<\/div>\n
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I. Purpose of production<\/h2>\n

The production requirements are met through skills such as identifying resistor resistance, capacitor size, diode positive and negative connections, practicing soldering of voltage regulator tubes, and learning to read circuit diagrams to solder circuits.<\/p>\n<\/section>\n

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II. Instrumentation used for production<\/h2>\n
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:: Instrumentation:<\/strong>
\nMultimeter, transformer.<\/div>\n
:: Tooling materials:<\/strong>
\nSoldering iron, pliers, screwdriver, tweezers, solder, rosin, flux.<\/div>\n<\/div>\n
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List of core materials:<\/strong><\/p>\n

1 LM317 integrated regulator, 1 LM337 integrated regulator, 1 BSK potentiometer, 2 each of 120 \u03a9 and 1k\u03a9 resistors, 1 each of 1000 \u03bcF\/50V polarized capacitors, 2 each of 1000 \u03bcF\/50 V, 10 \u03bcF\/25V, 100 \u03bcF\/25V type polarized capacitors, and 100 pF electrodeless capacitors, and 8 IN4007 diodes.<\/p>\n<\/div>\n<\/section>\n

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III. Description of products produced<\/h2>\n
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(1) Product name:<\/strong>\u00b11.25~12 V adjustable regulated power supply.<\/p>\n

(2) Principle of operation:<\/strong>The input of the voltage regulator circuit consists of a transformer, whose function is to turn the 220 V voltage alternating current into low-voltage alternating current, and then through the rectifier circuit and filtering circuit into direct current, and finally through the cooperation of the components in the regulator circuit to realize the adjustable regulated power supply.<\/p>\n

(3) Circuit block diagram and schematic:<\/strong><\/p>\n

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\"50609468736e83d75d13c5c6c380ac69\"Figure 14-4 Circuit Block Diagram<\/p>\n<\/div>\n

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\"4f40f2022388a14847c77d0a96a97c29\"Figure 14-5 Circuit Schematic<\/p>\n<\/div>\n<\/div>\n

(4) Component list list:<\/strong><\/p>\n

\n\n\n\n\n\n\n\n\n
Serial Number<\/th>\nName<\/th>\nModel\/Specification<\/th>\nQuantity<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nIntegrated Voltage Regulators<\/td>\nLM317 \/ LM337<\/td>\n1 each<\/td>\n<\/tr>\n
2<\/td>\nrectifier diode<\/td>\nIN4007<\/td>\n8<\/td>\n<\/tr>\n
3<\/td>\nelectrolytic capacitor<\/td>\n1000\u03bcF\/50V, 100\u03bcF\/25V, 10\u03bcF\/25V<\/td>\ncertain<\/td>\n<\/tr>\n
4<\/td>\nResistors\/Potentiometers<\/td>\n120\u03a9, 1k\u03a9, BSK Potentiometer<\/td>\n2 each<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Table 14-1 Component List List<\/p>\n\n\n\n\n\n\n\n\n\n\n
Name<\/td>\nQuantity\/pc<\/td>\n<\/tr>\n
LM317 Integrated Regulator<\/td>\n1<\/td>\n<\/tr>\n
LM337 Integrated Regulator<\/td>\n1<\/td>\n<\/tr>\n
BSK Potentiometers<\/td>\n2<\/td>\n<\/tr>\n
2200\u03bcF Capacitor<\/td>\n1<\/td>\n<\/tr>\n
1000\u03bcF Capacitance<\/td>\n2<\/td>\n<\/tr>\n
100 pF capacitor<\/td>\n2<\/td>\n<\/tr>\n
100 \u03bcF Capacitance<\/td>\n2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n
10\u03bcF Capacitance<\/td>\n2<\/td>\n<\/tr>\n
1 k\u03a9 resistor<\/td>\n2<\/td>\n<\/tr>\n
120 \u03a9<\/td>\n2<\/td>\n<\/tr>\n
IN4007 Diode<\/td>\n8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/section>\n
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IV. Production of data records and analysis<\/h2>\n
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(1) Actual output data when testing the circuit<\/strong><\/p>\n

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\"8d90052287d86beecdba2bdf020b2395\"Fig. 14-6 Actual output data when testing the circuit<\/p>\n<\/div>\n<\/div>\n

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(2) PCB Component Layout Picture<\/strong><\/p>\n

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\"252e9469e65c0b329fad63f7456dd987\"Figure 14-7 Board Component Layout Picture<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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(3) Debugging Problem Analysis and Handling<\/h3>\n

Give the problems that occurred during the installation and debugging of the circuit, analyze the causes of the problems, and give the methods and results of dealing with the problems. See the lab report record sheet for details.<\/p>\n<\/div>\n<\/div>\n<\/section>\n