We’ve marveled at ’s instrument packed lab before and watched his insider’s tour of a vintage radio transmitter. That’s a nice touch, though, because the Hakko can be returned to stock operation by a simple bridging plug, and the video below shows the marked difference in motor speed both with and without the VFD plugged in. Duty cycle and frequency are set by trimmers, and the whole thing is housed in an old chassis attached to the Hakko via an anachronistic socket and plug from the vacuum tube days. The VFD is just a TL494 PWM chip gating the primary coil of a power transformer through a MOSFET. He decided to build a simple VFD that boosts the frequency from 60-Hz mains to about 90-Hz, thereby jacking the motor speed up by 50%. Luckily for, his Hakko 470 desoldering station is equipped with an AC induction motor, so it’s a perfect candidate for a variable frequency drive to boost performance. So if the suction on your solder sucker is starting to suck, this simple VFD can help restore performance. Having heat and suction in a single tool is far more convenient than futzing with spring-loaded solder suckers or braid, but only as long as the suction in the desoldering tool has a little oomph behind it. A dedicated desoldering station is a fantastic tool if you’re in the business of harvesting components from old gear.
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December 2022
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