This video shows a fully assembled function generator soldering kit.

These kits are available for around £3 from AliExpress.
[ Ссылка ]

Also shown is a simple AC-DC power-supply, based on the LM317. Available as a soldering kit for around £5.
[ Ссылка ]

Similarly, the JYE Tech DSO138 oscilloscope used here is available as a kit. However, other handheld oscilloscopes are now available that offer enhanced functionality at very competitive prices.
Another video demonstrating the oscilloscope with audio tones: [ Ссылка ]

A longer video, by @Jerry Walker, showing assembly and a brief analysis of the function generator kit.
[ Ссылка ]

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