I have a new post on Hackaday: A Solar-Only, Battery-Free Device That Harvests Energy From A BPW34 Photodiode.
A Solar-Only, Battery-Free Device That Harvests Energy From A BPW34 Photodiode
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Category Archives: Chatter
The need for Physical Mathematics
Hacking Printed Circuit Board To Create Casing And Instrument Panels
I have a new post on Hackaday: Hacking Printed Circuit Board To Create Casing And Instrument Panels.
Automated Rubbish Removal System
I have a new post on Hackaday: Automated Rubbish Removal System.
How to think of electric circuits
Ali the Dazzling explains how to think of electric circuits: Circuits Finally Made Sense When I Saw This One Diagram.
He says to consider Ohm’s law as: I=V/R, where I is the “effect” and V is the “cause”.
2025 One Hertz Challenge: LoRaSense RGB Pi HAT
I have a new post on Hackaday: 2025 One Hertz Challenge: LoRaSense RGB Pi HAT.
Making a safe bench supply from a salvaged transformer
I have asked a question over on the EEVblog Beginners Forum: Making a safe bench supply from a salvaged transformer. I want to learn if it’s possible to make a low voltage AC bench supply from mains input in a safe way which could tolerate an accidental short circuit.
2025 One Hertz Challenge: Analog Clock For Microsoft Windows
I have a new post on Hackaday: 2025 One Hertz Challenge: Analog Clock For Microsoft Windows.
74HC595
A good introduction to the 74HC595 shift register over here: Why the 74HC595 is Your Next Favorite IC?
Happy birthday blog.jj5.net
14 years ago today I started this blog. It started as the ProgClub blog but eventually got moved over to blog.jj5.net.