2.4G band use increasing I have done a lot of surveying around my area, noting a big increase in 2.4G wifi over the last couple of years. What you can easily detect with a phone or laptop is only the tip of the iceberg. With a decent antenna or a […]
A computer nightmare I needed to have another look at my original CPU_3A3 68HC11F1 module. I was assembling a few of these and needed to test them. Last time I did this, 5 or 6 years ago, I still had a laptop running Windows-98 and a bootloader program that was […]
This is a off-line switchmode supply delivering +12V, -12V and +5V. The fault was that it wouldn’t work and a couple of capacitors on the mains input were in a bad way. Step one was to remove the faulty looking parts and clean the brown gunk off the board. Step […]
I was considering using a Raspberry Pi for a weather station which got me thinking about remote mounting and how to power it. About two years ago I designed and built some POE controllers for camera housings and outdoor wireless access points. These pass Ethernet through, take the power off […]
Following from the last post, I have been looking at the Raspberry Pi power supply and powering a USB external hard drive (HDD). I also changed from the 850mA Motorola phone charger to a 2 Amp 12V/5V supply (just connected the 5V) that was left over from a dead DVR. […]
To feed power directly to the Raspberry-Pi board without using the micro-USB connector, I soldered 2 wires directly to the back of the circuit board. The connection leaves the fuse and reverse-polarity protection diode in circuit. A couple of small holes drilled into the side of the case to form […]
I have recently updated the RC LED flasher controller to simplify the flash pattern programming slightly. Originally you needed a LED connected to channel 6 to indicate the pattern count. The small on-board status LED now provides the indication as well as channel 6; which is still useful when the […]
We have just done another test of the lost model tracker transmitter and the new yagi antenna. To make it interesting, a night test; in the dark. Waterproof the tracker transmitter I armed a transmitter using the servo tester, put it in a piece of bubble wrap and into a […]