Tiny and cheap lab generator

Function generator is a rely useful tool in the lab, a simple version can be build at home, there’s a lot of examples on the Internet, some are much more complex and powerful, but this one is intended to be really simple and cheap. It can be also built-in in some bigger projects that also requires a generator.

Tiny and cheap lab generator

The generator can output (only) square signal with adjusted frequency and pulse width. The amplitude may be also modified by soldering different values on the voltage divider on the output, it’s a bit laborious, but if it will be used in digital or microprocessor projects, then there isn’t really need for amplitude adjustment.

The generator is built from two NAND gates (IC1A, IC1B), that’s a classic configuration used in many other circuits. S1 and C1-C8 selects the frequency, there is an equitation for it, but the general rule is that the more capacity thy have, the lower frequency is generated. By adjusting witch one switch are set to ON state, we can select plugged capacitors and the output frequency. R2-R4, D1, D2 changes pulse width.

On the o’scope it’s visible, that the signal looks good, below images show the lowest and highest frequency signal that can be generated, but it could be expanded by using smaller/bigger C1-C8 and R2-R4.

Project was created in Eagle, you can download all of its files (including PCB images for home made etching) from my GitHub. Image of top side needs to be mirrored before printing.

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About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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