Use a Transistor for a Liquid-Triggered Switch
Garrett used a TIP-120 Darlington transistor, a capacitor, a resistor, and a heat sink to create a sensor that can detect when its electrodes have been immersed in a conductive liquid.
component of the month
What’s Inside an Array of Transistors?
ZeptoBars recently broke down a 7-transistor ULN2003 Darlington driver chip and analyzed what each component does, identifying the resistors, diodes, and transistors by peering at the chip through a microscope.
Building Memory Registers With Transistors
Teslaling’s DIY RAM uses 24 NPN transistors and 24 resistors to create three bits of memory.
How to Make a Homebrew NMOS Transistor
Jeri Ellsworth shows how to build your own NMOS transistor out of a kiln, vinyl cutter, Emulsitone, stain remover, and a silicon wafer she found on Ebay.
Component of the Month: The Transistor
Each month this year, we’re exploring a different electronic component, delving into what it is, how it works, and how you use it in projects. Last month we covered capacitors, and before that we looked at LEDs and diodes. This month we examine tranistors!
Clock Uses Capacitors To Store Energy and Mark Time
Polish maker Nereus built this great solar clock that features twelve sets of capacitors salvaged from electronic junk, serving both as energy storage as well as a decorative element.
Rebuilding Old Capacitors
Check out this great tutorial by Don Fox over on Make: Projects, describing how to rebuild vintage caps using smaller modern capacitors inside the old housing. When working in an old TV, audio amplifier, or turntable, invariably I will run across capacitors of all types, paper, mica, electrolytic, etc…. Generally when we run into caps […]
