We’re always happy to see hackers inspired to try something different by what they see on . To [SimpleTronic] has a project that will let you stretch your analog electronics skills in a really fun way. It’s an electromagnet pendulum analog circuit. Whether you’re building it, or just studying the schematics, this is a fun way to brush up on the non-digital side of the craft.

The is a neodymium magnet on the head of a bolt, dangling on a one foot aluminium chain. Below, a Hall Effect sensor rests atop an electromagnet — ″ in diameter, with 6/8″ wire coiled around another bolt. As the ’s magnet accelerates towards the electromagnet’s core, the Hall effect sensor registers an increase in voltage. The voltage peaks as the passes overhead, and as soon as the Hall Effect sensor detects the drop in voltage, the electromagnet flicks on for a moment to propel the away. This circuit has a very low power consumption, as the electromagnet is only on for about 0ms!

The other major components are a LM358N op-amp, a CD4001B quad CMOS NOR gate, and IRFD-120 MOSFET. [SimpleTronic] even took the time to highlight each part of the schematic in order to work through a complete explanation.

In the end, this analog circuit should help newcomers get familiar with electromagnets so they can move on to the next logical steps: coil guns and web shooters.

[Via Hackaday.io]

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