Julian's Postbag: #106 - LiPo Cell Tester and 6116 RAM

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[multimargejta]

Bring back old LED and boost/buck converter postbag videos :), for some reason this is pleasure to watch

[mikehudson]

What a blast from the past! Your computer reminded me of how to boot the PDP8 when I was at the cutting edge of electronics!! But we had real core memory. Now that would be an exciting addition....

[tomgeorge]

With the bent pins on your static RAM chips, if you can get the legs straight, mount them in machined pin DIL socket, then use the DIL socket pins to plug into your board.
That way you take ALL the strain of insertion and removal away from the IC.

[Roy_Tellason]

For some fun try setting up one of those RAM chips in a breadboard with inputs set up to disable the chip, then measure the power supplied to it. Last time I tried that it was under a microamp! Which is why a coin cell can keep the contents of the chip intact. The tricky part is making sure that none of the enable inputs are active when switching from main system power to backup and vice versa.

[JeffreySJonas]

The 6116 was *THE* SRAM chip around 1982. I used the 6116-LP (low power) when breadboarding my Z80 in anticipation of a battery-backup (never got around to that).

[EpicLPer]

Whoa I freaking jumped at 5:30 lol, scared the crap out of me :D

[Brutaltronics]

Skinny DIP RAM sounds like a naughty IC

[Mentorcase]

Yay it's postba---- Oh it's finished!

[RWBHere]

Those memory chips are recycled. The date codes are 1213 and 1426; different years. They're also different types, as signified by the 'L' at the end of the number on one of them. The pins were very likely bent even before the package was posted. And _foam plastic_ for 'protection'??! Static damage is also a possibility.

[markflack]

Short but sweet video, I do enjoy postbag.

[darthvader]

I think when you are talking these model batteries that the "S" stands for "series". Packs are denoted as 1S, 2S, 3S, then 1S2P, 2S2P, 3S2P etc. The S means series and the "P" means parallel. A 3S2P battery has 6 cells.

[aclam]

Didn't you notice the negative sign in the box on the bottom left of the case ??

[SpeccyMan]

Those battery testers are kind of superfluous on aircraft now since modern flight controllers have an input connection for battery voltage monitoring and an output connection for a buzzer. The first one came out shortly after I'd bought 3 of these - in typical fashion - so now they just sit in a box gathering dust.

[slap_my_hand]

You can get new SRAM ICs much cheaper (and without bent pins). A 32 KB PDIP SRAM costs 2€ on mouser.

[nor]

I need to stop watching you on mail day I end up buying stuff, Thanks😀

[T-Tronix]

scary to have li-po batteries like that in box with out individual packing. one small components between contacts and boom,

[benjamincrall]

What was in the upper right corner of the bench @ 5:20?

[vkhau]

The audio is a bit nasally, have you got a cold?

[modelt]

I was wondering, I know what sram and dram is, but why do most pc's use dram instead of sram, or is dram just faster?

[techy]

5:30 could do with a volume warning, I literally almost lost my hearing.