Dec 172013
 
N5ESE - Gizmos for QRP Ham Radio

“One day I noticed a project, obviously homebrew, mounted on a piece of plywood, and nearly covering the worktable. When I asked him what it was, he glowed as bright as the half-dozen tubes that lit up when he turned it on. Twenty seconds or so later, out spews from the speaker the cracklings and [...]

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Dec 162013
 
Flashing Mains Neon Lamp

Here is a Neon Flasher circuit (untested) for a user request at Circuits FAQ. This can be built into a switchboard or a gadget for indicating Live Power. D1-C1 form a simple half-wave rectifier, The Cap charges to peak voltage and can store charge for a long time if there is no bleeder. So while [...]

Dec 112013
 
BlackBoard - Circuit Layout.and Simulation

An Open Source “Learning EDA” Software which can setup circuit layouts. You may use it for stripboards, perfboards, breadboards, and even for plain circuitry or simulation. Creation and editing of symbols and elements on-the-fly using an integrated editor BlackBoard – Circuit Layout.and Simulation The Library has more than 300 different elements and symbols. Has an [...]

Nov 292013
 
Prototype Boards for Breadboard Testing

Bread Board – This is a reusable gadget like a connector, works like an IC base, only that the connectors in this are very long lasting. You can just plug in the components and connect using thick pre-tinned single strand wire. Big pins can ruin the sockets and powercircuits. Levels > 200mA or > 24V [...]

Nov 282013
 
Bluetooth Multimeter - Seeed Studio

“Bluetooth Multimeter is an intelligent peripheral of android phones, specially designed for engineers. Not only can it easily collect data such as voltage, current and resistance etc., this multimeter can also communicate with phones via bluetooth. Thus, the data gathered will be displayed on your phones.” Bluetooth Multimeter – Seeed Studio Totally open source, including [...]

Nov 202013
 
Dontronics - PIC and AVR Kits Shop

Dontronics World’s largest range of Microchip (PIC) and Atmel (AVR) Hardware and Software. They have many kits for Embedded SBC from small ones to the powerful types that run Linux. Dontronics – PIC and AVR Kits Shop They supply many boards from Olimex. One is shown here. MCU: PIC18LF8490 16KB Flash memory, 768 B RAM [...]

Nov 112013
 
LED Running lights CD4017

This is a Gadget Tutorial for this Article LED Running lights CD4017 – Live Gadget Page. Red Button Powers LED Running Lights, 555 Clock is counted by CD4017. Adjust R2, See ToolTips. This Demo shows LM555 running a CD4017 Counter to drive Ten Leds sequentially. Press the Red button below to turn on the circuit [...]