A fun project kit for learning hobby electronics. This kit (amazon link) is suitable for almost any age hobbyist but if younger than 12 it would be wise if someone older and with a little more experienced helped.
Really enjoyed putting this little line following robot car kit together. Instructions in English are available here in PDF: WHDTS Smart Intelligent Robot Tracking Car Assembly Manual
The magic for this little robot is performed by an LM353 IC. It’s a sweet little Dual Op-Amp processor.
DUAL OPERATIONAL AMPLIFIER 8 DIP. The LF353 is a JFET input operational amplifier with an internally
compensated input offset voltage. The JFET input device provides with bandwidth, low input bias currents and offset currents.
One little detail is the assembly manual shows the LM353 installed incorrectly. Here’s a picture of the right orientation.
The parts come loose in a plastic bag so step one can be identifying what are the parts are and where they go on the Printed Circuit Board (PCB) chassis. If you’re helping a youngster put this kit together you can instruct them in reading the resistor codes or using a multimeter to identify the ratings of the resistors so placement on the PCB is correct. The PCB is really well marked so placement of the components is readily obvious as to the correct location even without referring to the instructions. The one-and-only critique I have is in the English instructions the picture of the LM353 in the socket is wrong. The right way is pin one (marked with a small circle) facing to the front. I’ve attached a picture above of the LM353 IC correctly placed. You can have a lot of fun and learning putting this kit together and understanding the theory behind the way the LDRs (Light Dependent Resistors) detect the difference between the black of the line and the white of the area outside the line. And the way this information is used to keep the Robot Car on the right path.