240V Multiplexed PWM Light Controller

19.03.2015 · Posted in Uncategorized · Tags: , , , ,
lightgrid header

Heres the schematic and PCB of a work in progress for a 7x7 animated grid of incandescent light bulbs. The difficult thing about multiplexing high voltage is needing to drive the gate of the high-side MOSFETs within 12V of the source (340V peak). Luckily there are drivers specifically for this case: http://www.irf.com/product-info/datasheets/data/irs2181.pdf. I'm going to ...

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Homemade Geiger Counter

11.01.2015 · Posted in Uncategorized · Tags: ,
inside geiger counter header

How to turn an old Russian pocket radio into a Geiger counter. Here's the circuit diagram of the counter. It's a mixture of various other designs based on the parts that I had/could get. Click for full image: The tube I used was one that was on sale here from CoolComponents. They were like £5 ...

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