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"Sitting on Top of the World" with cats

on January 18, 2020

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Prepare to stuff your ears with cheese.
Bat Yanko, Oscar and Franco are about to the sing the blues.

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Location: Plovdiv, Bulgaria

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Testing DDR3 power consumption

Did a little power consumption testing of 6 different SODIMM DDR3 memory modules. Here are the readings of a Kill-A-Watt kind of device, measuring Watts on a Fujitsu Lifebook s792. - First reading is Watts at idle. - Second reading is average Watts while running MemTest+ 5.01. Hynix 1Rx8 2GB 10600-9-10-B1 (HMT325S6BFR8C-H9 NO AA) Idle: 9.6 / Load: 21.6 - 21.8 Samsung 2Rx8 2GB 10600S-09-10-F2 (M471B5673FH0-CH9) Idle: 9.6 / Load: 24.0 - 24.5 Kingston 2GB 2Rx8 PC3-10600S (SNY1333D3S9DR8/2G) Idle: 9.8 / Load: 23.2 - 23.7 Kingston 8GB 12800/1600MHz (KVR16S11/8and lots of other seemingly random numbers, see pic :) Idle: 9.8 / Load: 24.2 - 24.6 Hynix 4GB 1Rx8 PC3L-12800S-11-13-B4 (HMT451S6BFR8A-PB NO AA) Idle: 9.6 / Load: 23.5 - 23.9 Samsung 4GB 1Rx8 PC3L-12800S-11-12-B4 (M471B5173QH0-YK0) Idle: 9.7 / Load: 23.7 - 24.1 Some takeaways: Size doesn't seem to make much difference. Even the count of memory chips doesn't seem to matter much if at

The 19V-ish DIY powerbank

Ever wished yourself a power bank for your (non USB-C) laptop? I did lately, though I can't complain with the 7200 MAh battery of my Fujitsu Lifebook s792. First I looked up some power bank cases like this , as well as some DIY charge balancing boards. These look like a pretty nice option for use with 18650 cells (of which I have way too many...). One not-bad-looking balancing PCB I still haven't tried... So I ordered myself a few DIY carge balancing boards. However I could not just sit still waiting that to arrive from China. Why not just connect the 5 cells in series unprotected? Reading some opinions of (supposedly) competent people, it looks that the most important part of setting up a multi-cell battery is to pick balanced cells. That is, choose cells that have identical charge-discharge behavior. Just think of what a balancing board does - it cuts charging when a cell reaches top voltage, and it cuts output when a cell drops to termination voltage. That is

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"Sitting on Top of the World" with cats

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