Hi all, I am currently working on a range-switched photodiode design for use in our laboratory [1]. It took me a while, but I've arrived at a design I'm fairly happy with (in no small part thanks to...
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I am thinking to build electronics beacons for both outdoor and traveling. After seeing James Kim and the Mt. Hood climbers unable to let searchers locate them. I wonder what I can build some simple...
To generate frequencies from approximately 0.5 mHz to 12 MHz with a DDS a minimum clock of >24, say 25 MHz, is required. To be able to go down to 0.5 mHz, a phase accumulator of at least 36 bits is...
Hello, I'm having some issues getting this little guy to run: The site says this is a 2-phase bipolar stepper motor. Has anyone used this model before ? I've rigged up the schematic provided: but it...
When I moved house about five years ago, I stupidly left my motor mower in the shed!! Stupid Me! So, over the last five years, I've been getting a 'Jim's Gardening' guy in to mow and clean up the...
Have any of you noticed that your remote control, for a tv or whatever, doesn't work at first, if you haven't used it for a day or two? I keep thinking the batteries have died, but after a couple...
I have a Meyer Sound 833 control unit on my bench. It has a weird fault that appears to centre around a 15kHz oscillation that affects one channel, directly, but is bleeding through to the other...
This Schumacher 1042A-PE battery charger stopped functioning today. It seemed to work for a little while but when I noticed the car battery's voltage wasn't slowly increasing after performing a 2 amp...
I replaced the ballast and fluorescent tubes in a bathroom fixture with LED replacements. I'm gradually doing this to all my fluorescent fixtures as they stop working. I always buy direct wire and...
I have been given a number of 7x5 dot matrix display segments. There are 7 pins at the top and 7 at the bottom. The ID on the segment is: LTP2157AE 927 TAIWAN P Can someone be kind enough to explain...
So, I've learned the hard way that it isn't trivial to solder a LED matrix. I've actually extended that lesson to realize any non-planar graph adds difficulty to soldering. Anyway. I was trying to...
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