A few photos of my take on the Mastech MS8229 multimeter RS232 hack discussed at http://www.eevblog.com/forum/projects/mastech-ms8229-rs232-hack/. Basically, this adds PC data logging support. The SMD resistors, before hot glue
I have just upgraded my Mastech HY1803D lab power supply with a 10-turn voltage adjustment potentiometer. In order to perform the upgrade, you would need a 6.8K potentiometer (at least the original is). The trickiest part is removing the knob from the old pot. It is glued on, use pliers, soft padding and some leverage… Read More »
I’m quite disappointed about how fast my LED flashlight drains its battery. This mod will reduce the current consumption and hopefully still give enough light for cycling.
I’ve just discovered an undocumented command of the Velleman PS3005D programmable lab power supply. This PSU is available as a number of clones like Korad KA3005P reviewed at EEVBlog. I don’t know much about the serial communication protocol in the other PSU variants, perhaps they are different.
Quick info on how to start disassembling a DELL 2209WAf monitor. No pictures this time, but perhaps it will help. Remove the stand and the 4 screws behind the stand. These are the only screws in the case Pry the front bezel off. Do the corner with the buttons last. You may leave the front… Read More »
This is a simple universal RS232 DB9 gender converter. It covers all plug combinations, both straight through and crossover. I have only connected RX, TX and ground so far since those are enough for me most of the time. Quite a handy tool for less than 1 euro and one hour work.
The Samsung SyncMaster 225BW LCD monitor does not support pivoting. However, modifying the monitor so that it is fixed in portrait mode proved to be very easy. After it is done, the height adjustment of the stand is affected – in its highest position the bottom of the screen bezel is about 87mm from the… Read More »
My 12-year old Casio scientific calculator LCD stopped showing a couple of rows recently. After taking it apart, i found a flexible ribbon cable either glued or soldered to the edge of the PCB. As a first try, I heated the connection a little and it worked. Some slight finger-poking helped to find which part… Read More »