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Archive for June, 2014

Building Inexpensive CNC Machines for Computer-Controlled Drilling and Milling

When I started thinking about CNC machines, I just wanted a computer-controlled machine that would be able to automatically drill all of the holes in the printed circuit boards that I made, for my Curve Tracer kits (see the link, above). But, the “good” commercially-available machines were priced higher than the amount that I could […]

DIY Pcb Hand Drilling Machine

http://www.instructables.com/id/DIY-Pcb-Hand-Drilling-Machine/

DIY Home Made Circuit Board (PCB) Drill

Switch mode power supplies (SMPS) Projects

Simplest switching power supply ever with TNY263 – TNY268 3.4V 2.5A supply with optocoupler14.5V (8 – 18V) 0.4A supply with optocoupler 12V 5A switched power supply 12V and 90V switched power supply with UC3842 Simple non-regulated supply 2x 35V 350W for audio amplifier Switched power supply 2x 35V 350W Welding inverter up to 100A Electronic halogen transformer Switched current power supply for 1W […]

Tips for Etching PCB Toner Transfer

How to make PCB using Marker pen

Making of PCBs at home, DIY using inexpenive materials

Microcontroller Projects

Atmel AVR for beginners – programming Light Snakes and Air display Atmel AVR for beginners 2 – Interrupts and binary counter Atmel AVR for beginners 3 – how to write the AVR The simplest digital real time clock with AVR Multifunctional real time clock with AVR Multifunctional clock with 2 displays The simplest digital real time LCD clock with AVR Digital LCD […]

Printed circuit board (PCB) etching process by FeCl3 & Laser Printer Toner Transfer

Wire Antennas for Ham Radio

01 – Tee Antenna 02 – Half-Lamda Tee Antenna 03 – Twin-Led Marconi Antenna 04 – Swallow-Tail Antenna 05 – Random Length Radiator Wire Antenna 06 – Windom Antenna 07 – Windom Antenna – Feed with coax cable 08 – Quarter Wavelength Vertical Antenna  09 – Folded Marconi Tee Antenna 10 – Zeppelin Antenna 11 […]

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