Leaderboard

Thanks for pointing out the mistake, I have updated the post to show 2.0 LSB which is the correct Offset error for this device

Thank you so much for this helpful document. In the offset error section; you first say the offset error is 2.5 LSB but then you mention it as 0.5 LSB typical and 2.0 LBS at max. This made me confused a little bit

In case anyone was curious, and pictures or it did not happen. Here is the completed data collection unit. The engraving was with my laser. The PCB image is really a ChipKit (just a handy DXF I had). Unfortunately the laser water flow sensor had a leak so the tube overheated and lost power most of the they through the engraving. This has all been fixed and apparently no permanent damage. Oh well. It still looks nice. Front and back panels are laser cut acrylic. Blue extrusion is from here: https://www.amazon.com/dp/B07MPX23FS/ref=cm_sw_em_r_mt_dp_U_QPQ4Eb3MH0BNX The mounting flanges are these: https://www.amazon.com/dp/B07MZPFWKK/ref=cm_sw_em_r_mt_dp_U_BQQ4Eb6BE926B

I just received a care package from my father with a pile of old "junk". In there was a Speak and Spell from around 1978, I don't know when mine was bought. I quickly checked the battery compartment (4 C-cells) fearing to find a pile of corrosion. I did, but it was the rusty sort. The battery contacts were rusted. I opened the unit, removed the contacts and dropped them in vinegar to dissolve the rust. The contacts completely fell apart. A quick Amazon order for Keystone 209's and I was back in business. The new clips seem to be slightly thicker or perhaps stiffer, as the batteries are more difficult to insert. BUT it works! While I was waiting for the 209's to arrive, I considered adding an 18650 battery and a USB battery charger. The old TMS5100 series electronics runs from -15v so there is an inverting boost regulator to drop the 6v down to the -15. I tested and this works OK from 5v which is the standard output from the variety of battery manager/chargers you can find. But in the end I did not want a second button to activate the USB battery and then the normal ON button to activate the device. In any case, my 5 year old son loves it, though he did ask "can we install more games".