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Hey friend, if you have ever wanted to melt small bits of metal, bend rods without a torch, or just experiment with high-frequency induction heating in your workshop, this 500-watt circuit is a fantastic starting point. I have constructed several induction heaters like this one over the years, flyback driver that packs serious power. It … Read more
Hey friend, if you are tired of bulky linear power supplies that run hot and waste energy, or those cheap adapters that fail after a few months, building this simple 5V 2A switch-mode power supply (SMPS) is a game-changer. I have assembled dozens of these over my career as an electronics engineer, and the circuit … Read more
Hey friend, if you are looking for a basic electric fencing setup that keeps livestock in check or deters pests without all the bells and whistles of commercial units, this straightforward SCR-based circuit is a solid pick. I have put together a few of these over the years, and they work reliably for small to … Read more
Hey friend, if you want a dead-simple, ultra-reliable 12 V to 220 V square-wave inverter that can swing a real 800–1000 W continuous load without fancy microcontrollers or expensive driver boards, then this exact circuit is the one I still build in 2025. I’ve made at least twenty of these over the years, and one … Read more
Hey friend, if you’ve ever needed to crank a 12V battery up to a solid 220V DC for running high-voltage gear like tube amps, electrostatic dusters, or even some industrial sensors without the bulk of a linear supply, this SG3525-based DC-DC converter is your new secret weapon. I’ve tinkered with these circuits for years as … Read more
Hey friend, if you’ve ever wanted a tiny FM transmitter that actually reaches across the house, the garden, or even the whole street with clear, loud audio, then this legendary single-transistor design is pure gold. I’ve built hundreds of these over the years, and it’s still the simplest, most powerful one-transistor FM bug you can … Read more
Hey friend, if you’ve ever wanted a proper little audio amplifier that sounds clean, pushes a real 8–10 watts into a 4 Ω speaker, and barely gets warm on a 12 V supply, then this clever hybrid Class-D design is going to make you smile. I’ve built probably twenty of these over the years, and … Read more
Hey friend, if you’ve ever needed to keep pigs out of the garden, stop dogs digging under the fence, or want the cheapest possible electric fence that still delivers a proper “don’t touch me again” zap, then this legendary one-transistor circuit is pure genius. I’ve built dozens of these over the years, and it remains … Read more
Hey friend, if you’ve ever blown up an LM317 while trying to pull more than an amp, or got frustrated because your “0–30 V” kit won’t go below 1.4 V, then this old-school but bullet-proof circuit is about to become your new best friend. This exact 1–30 V regulator built around the ancient-but-immortal LM723 precision … Read more
Hey friend, if you have ever wished for a bench power supply that actually does what the expensive lab units promise — smooth voltage adjustment from zero right up to 30 V and rock-solid current limiting all the way to 8 A — then this circuit is pure gold. I have built, repaired, and tweaked … Read more