Welding practice board includes PTH components and surface mount packages (SMD) of common basic components such as resistors, capacitors, transistors, mosfet, diodes and inductors. After welding the components that need to be welded (to start the circuit function), the board can achieve the effects of running lights and breathing lights. The board provides 0805/0603/0402/0201/01005 and other packages for advanced challenges, comprehensively assessing the welding skills of the welder.

Welding Practice Board Pth And Smd

After power on, slide the switch to the side near the Type-C end (ON). The DIP switch from left to right controls the on and off of the straight-through running lights. The rightmost switch controls the on and off of the 24 LEDs in the upper right corner for the breathing light effect. The effects of running lights and breathing lights are controlled by tapping the button. When the button is not pressed, the gate (G) of the Mosfet is pulled to a low level by a 100KΩ pull-down resistor, keeping the gate of the Mosfet in a stable low-level initial state to prevent external interference and ensure a stable state. The Mosfet is conducting, and the LED is controlled by the DIP switch. When the button is pressed, the gate of the Mosfet is at a high level, the Mosfet is cut off and not conducting, and the running light or breathing light effect of the LED starts. The priority of the button is higher than that of the DIP switch. The role of the Schottky diode is to prevent current backflow.

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See also the SMD only version:

SMD soldering training PCB functional circuits

Schematic Welding practice board PTH and SMD

Schematic Welding Practice Board Pth And Smd
Schematic Welding Practice Board Pth And Smd

Running light circuit

The running light effect is achieved using an NE555 timer to construct a multivibrator driving a CD4017 decimal counter.

Breathing light circuit

The breathing light effect is achieved using an LM358 operational amplifier and peripheral circuitry to construct a triangle wave signal generator.

Welding Practice Board Pth And Smd Colorfull Pcb Welding Practice Board 555, Cd4017, Circuits, Led Circuit, Light / Led, Pcb, Pcb-Layout, Schematic, Solder, Tips, Tutorial Welding Practice Board Pth And Smd

BOM Welding practice board PTH and SMD

Parts Value Description Quantity
Resistors
R1,R2,R3,R4,R5,R6,R7 1kΩ (102) RES-TH 1/4W 7
R8,R14,R15 100kΩ (104) R0805 – SMD resistor 3
R9,R10 10kΩ (103) R0805 – SMD resistor 2
R11,R12,R13 47kΩ (473) R0805 – SMD resistor 3
R16 100Ω (101) R0805 – SMD resistor 1
R17 01005 R01005 – SMD resistor 1
R18 0201 R0201 – SMD resistor 1
R19 0402 R0402 – SMD resistor 1
R20 0603 R0603 – SMD resistor 1
R21 0805 R0805 – SMD resistor 1
RP1,RP2 50kΩ (503) 3362P trimpot 2
Capacitors
C1,C2 10uF Aluminum Electrolytic capacitor 2
C3,C4 100nF Ceramic capacitor 2
C5 1uF SMD ceramic capacitor 0805 1
C6,C8 10uF SMD ceramic capacitor 0805 2
C7,C9 100nF SMD ceramic capacitor 0805 2
C10 47uF SMD ceramic capacitor 0805 1
C11 10uF SMD Aluminum Electrolytic Capacitor 1
C12,C13 10uF CASE-A-3216-18 Tantalum Capacitor 2
Semiconductors
D1,D2,D3,D4,D5,D6,D7 1N5817 DO-41 Schottky Diode 7
D8,D9,D10,D11,D12,D13,D14,D22 SS34 SMA(DO-214AC) Schottky Diode 8
LED1,LED2,LED3,LED4,LED5,LED6,LED7 204-10SURD/S530-A3-L 3mm LED RED 7
LED8,LED9,LED10,LED11,LED12,LED13,
LED14,LED15,LED16,LED17,LED18,LED19,
LED20,LED21,LED22,LED23,LED24,LED25,
LED26,LED27,LED28,LED29,LED30,LED31
KT-0805G LED0805 RED LED 24
Q1,Q2 SS8050-TA NPN transistor TO-92-3 2
Q3 FSS2301M P-Channel SOT-23 MOSFET 1
Q4 SS8050 NPN transistor SOT-23 1
Q5 FSS2301M A1SHB SOT-23-3 P-Channel SOT-23 MOSFET 1
U1 100kHz 100kHz SOP-8 Timer 1
U2 CD4017 SOP-16 Counter 1
U3 AMS1117-3.3 1A Fixed 3.3V Positive SOT-223 Voltage Regulator
Linear, Low Drop Out (LDO)
1
U4 LM358 SOP-8 Operational Amplifier 1
Miscellaneous
H1,H2,H3,H4 M3 screw column TH_BD4.7-D3.0 4
L1,L2 XR0410-102 Color Ring Inductor 2
L3 10uH SMD,5.2×5.4mm Power Inductor 1
L4,L5,L6,L7,L8 10uH L0805 SMD inductor 5
SW1 HX SS12D07VG4 Slide Switch 1
SW2 DSWB08LHGET 8-bit SPST DIP Switch 1
SW3,SW4 TS-1002S-06026C 6x6mm Tactile Switch 2
USB1 KH-TYPE-C-2P 2P Type-C USB Connector 1
X1 32.768kHz 32.768kHz SMD crystal oscillator SMD3215-2P 1
X2 12MHz 12MHz SMD crystal oscillator SMD3225-4P Crystal 1

Download files, links, and notes

Welding Practice Board Pth And Smd Pcb 3D
Welding Practice Board Pth And Smd Pcb 3D

Source: https://oshwhub.com/course-examples/jia-li-chuang-eda-zong-he-han-jie-lian-xi-ban

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Xtronic.org blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.
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