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Product description of SMT soldering exercise board
Power supply voltage: 5V.
The ratio circuit is NE555 + 4017 application circuit, and the multivibrator is composed of NE555.
The pulse oscillation signal outputs CD4017 to count through the three pins of NE555. CD4017 will output high level on q0-q4 in turn with the input pulse signal to light up the corresponding light-emitting diodes. These light-emitting diodes are arranged in a circle to form the effect of water lamp. When cd017 counts to 10, the carry end C0 will change from low to high, The driving triode Q1-Q4 is turned on to light up the LED at four corners. When the next pulse comes, the C0 end returns to the low level, and the LED at four corners goes out, and so on.
Finished product of SMT welding board
Solder Practice Board Kit List
Schematic Diagram of SMD Welding Exercise Board
The front and back of the blank board
Spare parts.You need to weld and install it yourself.
Tim Baker
2025-07-14 18:17:11
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Robert
2025-07-09 11:26:48
Exactly what I was looking for. Quality seems great.
Jeff C.
2025-06-28 11:16:00
The instructions were barely readable, I basically had to count the components and figure out what was what and where it went. Believe me when I tell you you're going to need a hot air station and solder paste for this, and if you're just breaking into this hobby it honestly might behoove you to buy two of these. The board quality is pretty low (but again, cheap demonstrator) so the risk of delamination for hot air is pretty high. The electrolytic capacitors, diodes, and crystal aren't fans of soldering irons, so you're going to need some paste, hot air, and some patience. I borked the first one (could be a multitude of reasons, really) so I'm re-buying it just to say I slayed the dragon.
Customer
2025-06-01 11:13:22
I've been doing all my soldering with a bulky pencil type iron I bought at Radio Shack 30 years ago. I treated myself to a hot air rework station during last year's Amazon Day sale. I'd never done any SMD work with hot air, so I bought these to gain some skills. It took me a hot minute (pun intended) to figure out the Engrish instructions that came with the kits. Once I got it figured out, though, it was a lot of fun assembling the boards. They were even thoughtful enough to include extras of the very small components. I definitely fat fingered some of the packages and sent tiny parts into orbit, never to be seen again. Everything lit up beautifully when I finished and applied power. I'm thinking about adding the smallest as a project for the engineering classes I teach at the local university. I was already a skilled at soldering, but I was better by the time I finished.
Karl in TN
2025-05-09 17:38:11
There are many parts but only a few actually comprise the functional circuit. The describe the functional and solder practice only clearly. The lighted circuit works delightfully, a reward for using sparing amounts of solder paste! The red board is a good start. Then the green. Blue last since it is way more involved.Did the second board (green pcb) same circuit but corner LED's are blue. Good schematic but resistance values do not match the parts! Where it says 330 Ω use 1kΩ, just like the red board. Where it says 2MΩ, use 10 meg, just like the red board. The red board had little +'s for LED and the 1N4148 diodes. The green board did not. No matter, the plus end of the diodes all were connected to a resistor.
Customer
2025-02-23 10:57:54
These work as you would expect. Directions are a little hard to follow. I installed the LEDs backwards and had to buy extra LEDs to finish the kits.
Jeff Sims
2025-01-14 18:42:39
These are great practice kits for those who want to learn SMD soldering. Before you start on these kits, watch as many instructional youtube videos as you can. Get the right tools. Of course, there are a number of different opinions on how best to do SMD soldering and with these kits you have plenty of components to experiment with. Always test your work, if possible. It is unfortunate that on ICs, it is difficult to know if you have succeeded.
massed
2024-11-19 15:24:16
The pictures and instructions sent were blurry. No instructions, no labels. Parts are so small, how can anyone identify an LED from capacitor or resister? Also missing parts, poor Q&A. Need a superfine tip for soldering, magnifying glass, tweezers, and superfine blade. All parts should have been labeled for easy identification and build.
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