Tag Archives: diy

How to create a cheap DIY backlit keyboard

Well, it is not really backlit. It is rather “overlit”. I took a clear-plastic-and-cardboard case, added a few LED bulbs and a transistor and connected them to 5 volts from a USB port. It is a cheap solution but far … Continue reading

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How to power 12v LED strip using 5v USB port – add a step-up transformer

USB ports supply 5 volts. The 12v LED strip requires at least 9 volts. I bought a step-up DC-to-DC boost transformer circuit which can step up from 1.5v and up it up 24 or 32 volts. It took 5 volts … Continue reading

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Low-cost DIY portable emergency light using LED strips & 9-volt rechargeable batteries

The white LED strips operate at 12 volts. They will light up even at at 9 volts but will be less brighter. The multi-colored LEDs are not really an emergency lighting option but are good enough to help you find … Continue reading

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The best LM386 video tutorial ever!

Add a 1000 uF polarised capacitor between the positive and negative rails to eliminate noise that occurs when the voltage source is from an AC-DC adapter.

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My DIY radio & MP3 player with built-in tweeter, mid & woofer speakers

The woofer is from an old 2.1 Philips PC desktop speaker. The speaker cone was replaced recently. The FM antenna is just a wire. The mid & tweeter speakers on the rear are new. They are full-range speakers, not really … Continue reading

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My DIY Boom Box doing time with AC adapter and hanging bed switch

I got lots of speakers, media players and amplifiers. I have two amplifiers in development. So, I moved my original LM386 DIY Boom Box to the kitchen where it is powered by a AC adapter. To cut the power when … Continue reading

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DIY RJ45 plug locking tab protector made from cable sheath

With great hope, I cut a piece of the sheath and stuck it to the RJ-45 plug (I crimped a new one today) just below the locking tab, taking inspiration from the Sugru RJ-45 protector on Instructables.com. I don’t know … Continue reading

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Adding MORE POWER to puny speakers

A recurring theme in Tim Allen’s show-in-a-show Tool Time (Home Improvement) was MORE POWER. Tim Allen used to take regular devices and boost them up with more high-rated components. My last two DIY projects are like that. A website was … Continue reading

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A low-cost DIY desktop USB speaker

This plastic bottle came as a “free” item with a Horlicks pack. I put a speaker on top of it and harnessed it with a three-piece rubberband restraint. Inside the bottle, I have a PAM 8403 IC board, which I … Continue reading

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How to recycle laptop batteries – create low-cost DIY USB power banks with 18650 charger cases

USB power banks are selling for very high prices. Most provide 2000 to 3000 maH of charge. Some give 5000 mAH but cost around 6,000 rupees! Buying these expensive power banks is stupid. I bought a 20,000 maH power bank … Continue reading

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