Hands-On Project: Soldering and Assembly of a ±1.25~12 V Adjustable Regulated Power Supply

Electronic Process Training - Analog Circuit Assembly

I. Purpose of production

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.

II. Instrumentation used for production

:: Instrumentation:
Multimeter, transformer.

:: Tooling materials:
Soldering iron, pliers, screwdriver, tweezers, solder, rosin, flux.

List of core materials:

1 LM317 integrated regulator, 1 LM337 integrated regulator, 1 BSK potentiometer, 2 each of 120 Ω and 1kΩ resistors, 1 each of 1000 μF/50V polarized capacitors, 2 each of 1000 μF/50 V, 10 μF/25V, 100 μF/25V type polarized capacitors, and 100 pF electrodeless capacitors, and 8 IN4007 diodes.

III. Description of products produced

(1) Product name:±1.25~12 V adjustable regulated power supply.

(2) Principle of operation: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.

(3) Circuit block diagram and schematic:

Figure 14-4 Circuit Block Diagram

Figure 14-5 Circuit Schematic

(4) Component list list:

Serial Number	Name	Model/Specification	Quantity
1	Integrated Voltage Regulators	LM317 / LM337	1 each
2	rectifier diode	IN4007	8
3	electrolytic capacitor	1000μF/50V, 100μF/25V, 10μF/25V	certain
4	Resistors/Potentiometers	120Ω, 1kΩ, BSK Potentiometer	2 each

Table 14-1 Component List List

Name	Quantity/pc
LM317 Integrated Regulator	1
LM337 Integrated Regulator	1
BSK Potentiometers	2
2200μF Capacitor	1
1000μF Capacitance	2
100 pF capacitor	2
100 μF Capacitance	2

10μF Capacitance	2
1 kΩ resistor	2
120 Ω	2
IN4007 Diode	8

IV. Production of data records and analysis

(1) Actual output data when testing the circuit

Fig. 14-6 Actual output data when testing the circuit

(2) PCB Component Layout Picture

Figure 14-7 Board Component Layout Picture

(3) Debugging Problem Analysis and Handling

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.