VARTA battery.
AM going to try dwagon's 7805 trick to constant current discharge the battery, just for fun.
So nice to see that my big box of random salvage semi-conductors might be useful !
Let's see what I can find in there !
Emptied it all on the bench, pulled all the TO220 looking packages I could find, sorted them... hey presto, found no less than 34 78/79 regulators, of which 15 were 7805 !
Surely at least one of them must be working....
As I was looking at every TO220 package to find the 78/79, every time I read "IRF" I though to myself "fuck me, must be a MOSFET and I just killed it just by handling it ". Oh well, you gotta have casualties I guess...
No that I spent time sorting these regulators, no way i hell I am putting them back in the box ! So will put them in a separate box... I didn't plan on starting to sort my components just now, wanted to leave that 'til the end, but I guess this is the start of it ! So, at least a little bit of it has now been done...
Let's go wire that up on the breadboard see if that works....
...One of my past jobs was porting an expert system development tool (i.e. AI), written in FORTRAN on PCs under DOS, to Sun, Apollo, Ngen and RS/6000 workstations.Oh, you poor poor bastard. We didn't know you were a PTSD case; I'll lay off from now on, you've got good reason to be grumpy.
mnem
I write my code with a pencil. In spiral notebooks.
I'd put on muh flameproof jammies, but dwagons don't need 'em.
What editor you like the most?
- vi
- nano
- emacs
Got the Agilent 34461A out of hock (it was doing temperature measurements somewhere else) and actually measured the ramp-up and ramp-down of the PCT-100:
[..]
The whole X axis is 8 minutes. Switch-on was at time 0. I switched it from heat to cool at the 4 minute mark by which time it had pretty much topped out at 149 ºC. So the left half is the ramp up to maximum, the right half the ramp down from switching 'off' to 4 minutes later. The PCT-100 cut the fan off at 45ºC, which was sometime around the 3 minute mark. Sensor used was a 2 wire Pt-100 platinum RTD sensor in a small (3 x 25mm) steel case.
So, intuition fail - the ramp down is more like 1ºC/second, plenty slow enough for thermal shock to be non existant.
5-channel paper tape on a 5cps teletype...
What editor you like the most?
- vi
- nano
- emacs
Ok, so I am officially envy-green now That Metcal pre-heater is coming in at 450€ here in Germany...
VARTA battery.
AM going to try dwagon's 7805 trick to constant current discharge the battery, just for fun.
So nice to see that my big box of random salvage semi-conductors might be useful !
Let's see what I can find in there !
Emptied it all on the bench, pulled all the TO220 looking packages I could find, sorted them... hey presto, found no less than 34 78/79 regulators, of which 15 were 7805 !
Surely at least one of them must be working....
As I was looking at every TO220 package to find the 78/79, every time I read "IRF" I though to myself "fuck me, must be a MOSFET and I just killed it just by handling it ". Oh well, you gotta have casualties I guess...
No that I spent time sorting these regulators, no way i hell I am putting them back in the box ! So will put them in a separate box... I didn't plan on starting to sort my components just now, wanted to leave that 'til the end, but I guess this is the start of it ! So, at least a little bit of it has now been done...
Let's go wire that up on the breadboard see if that works....
Probably not, unless you've been shuffling your feet around on the carpet building up a charge. Modern power mosfets are generally pretty robust.
VARTA battery.
AM going to try dwagon's 7805 trick to constant current discharge the battery, just for fun. So nice to see that my big box of random salvage semi-conductors might be useful ! Let's see what I can find in there !
Emptied it all on the bench, pulled all the TO220 looking packages I could find, sorted them... hey presto, found no less than 34 78/79 regulators, of which 15 were 7805 ! Surely at least one of them must be working....
As I was looking at every TO220 package to find the 78/79, every time I read "IRF" I though to myself "fuck me, must be a MOSFET and I just killed it just by handling it ". Oh well, you gotta have casualties I guess...
No that I spent time sorting these regulators, no way i hell I am putting them back in the box ! So will put them in a separate box... I didn't plan on starting to sort my components just now, wanted to leave that 'til the end, but I guess this is the start of it ! So, at least a little bit of it has now been done...
Let's go wire that up on the breadboard see if that works....
I'd put on muh flameproof jammies, but dwagons don't need 'em.The dragon probably finds himself short of breath when he realises that what he wrote is completely irrelevant to the poll.
.
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VARTA battery.
AM going to try dwagon's 7805 trick to constant current discharge the battery, just for fun. So nice to see that my big box of random salvage semi-conductors might be useful ! Let's see what I can find in there !
Emptied it all on the bench, pulled all the TO220 looking packages I could find, sorted them... hey presto, found no less than 34 78/79 regulators, of which 15 were 7805 ! Surely at least one of them must be working....
As I was looking at every TO220 package to find the 78/79, every time I read "IRF" I though to myself "fuck me, must be a MOSFET and I just killed it just by handling it ". Oh well, you gotta have casualties I guess...
No that I spent time sorting these regulators, no way i hell I am putting them back in the box ! So will put them in a separate box... I didn't plan on starting to sort my components just now, wanted to leave that 'til the end, but I guess this is the start of it ! So, at least a little bit of it has now been done...
Let's go wire that up on the breadboard see if that works....
Don't get too hung up on organizing your semis. This is all stuff bought back in my Cheap Tunes days; when I worked a flea market route in Florida. Mostly AF amps for old car audio and boom boxes, plus a whole assortment of logic, sensors, and motor drive ICs for 90s-00s vintage VCRs, DVD players and CD decks.
Point being... I have 5 more drawers just like this one, and if I search through them more than once in a month, it's unusual.
And yes, they really are all sorted into those crystal compartment boxes with no ESD protection, and I don't give a fuck. Most of it is silicon; what isn't usually came from the supplier in tinfoil. What little remains that is unprotected CMOS... fuggitt. Let my son figure it out when he inherits this mess.
And then there's another 10 drawers of salvaged semis and discretes... and a couple 20 gallon totes of "donor PCBs" (pared down from like 20 bins, no lie)... and in my Canada stuff, I emptied 20 more drawers worth of new semis, discretes, SMDs and kits into a 120 gallon tote... and then there's the tools...
mnem
"things" are a trap.
...One of my past jobs was porting an expert system development tool (i.e. AI), written in FORTRAN on PCs under DOS, to Sun, Apollo, Ngen and RS/6000 workstations.Oh, you poor poor bastard. We didn't know you were a PTSD case; I'll lay off from now on, you've got good reason to be grumpy.
mnem
I write my code with a pencil. In spiral notebooks.
That which does not kill you makes you stronger. I can now, metaphorically speaking, reenact the cooler scene from the Great Escape, where Steve McQueen bounces the ball off the wall with his hand, with a cannonball and my testicles. I can, but I choose not to; doing network orchestration in Python (what were they thinking) is the nearest I have come in recent years.
What editor you like the most?
- vi
- nano
- emacs
Oh no I am not too hung up as you say (had to google it...) ... just trying to put some sort of order because as you see right now it's just... unusable as it is, and of course I have 3 times as much coming when I get round, progressively, to dismantly the 4 big boxes full of scrap boards I have here...
So I just want to keep the stuff that reasonable going to be used. power trannies, voltage regulators, op-amps... the kind of generic stuff that when I need one to play with, I don't have to spent 3 hours driving down town and queuing for an hour, to buy from my local electronics shop.
If I want to cobble something together quick, a proof of concept, or something quick and dirty, I want to be able to open a drawer and just pick an op-amp or BJT or MOSFET or voltage regulator or diode, diode bridge, dual-diode...or anything mundane like this. I refuse to waste time and money driving to the shop every time I need something basic like this.
So I need to sort all that stuff, keep the generic stuff that can be used, and throw away the specific stuff that's never going to be used, at least not by me, like chips specific to audio/video stuff in old TV sets or whatever consumer electronics stuff I tore apart.
However I do want to buy some ESD foam to store all that... if just because it makes them easy to see, easy to grap, and put back, and allow for a compact layout. Any space saving measure I can take, I am willing to consider...
This evening rushed to H/W store just before it closed. Bought 3 little plastic drawer units to get me started in sorting my stuff (not just semis.... all the rest as well...) this evening. They have them in lots of different sizes. Picked two different sizes here to get me started.. will see how it goes and probably get more of them tomorrow as I see fit.
QUESTION : I looked on Ebay to order some ESD foam, but realize that there are TWO different densities available ?! Never realize that until now...
Which one do people recommend ?! I am worried that the denser foam might be might make it difficult to insert packages with thin / fragile legs, never mind large DIP chips with lots of such pins ? On the other hand I am worried that the less dense foam might not have enough "grip" to hold a TO220 package upright . I guess I can order both and see what works best but... if I could avoid wasting money buying stuff that I won't even end up using....
What editor you like the most?
- vi
- nano
- emacs
5-channel paper tape on a 5cps teletype, or edlin, or VAX/VMS edt where you didn't know which word the "delete word" command would delete.
That and vi(le) were probably the source of Smalltalk's "don't mode me in" motto and T-shirt
bought a PACE pcb repair kit for 45 brussels pesos. To check it out for CPU board repair. Still have my Bungard press for eyelet repair, however I need to redo a couple of traces. Which will be a pain in the intestines
Ok, so I am officially envy-green now That Metcal pre-heater is coming in at 450€ here in Germany...
Oh yeah, the new prices are eye watering. I missed one that went for £135 a couple of weeks back (I underbid) and decided to bite the bullet when I saw this one as a buy it now of £180. Tad higher than I'd like to have paid but it looked really clean (and proved to be so) and at least with Metcal you only buy it once. (Whereas anyone who's tempted by the circa £100 China direct preheaters will probably end up buying something else that actually works or doesn't break within a year.) Leastways, that's my excuse for splashing out, and I'm sticking to it.
I have seen one of these China "Keysight" USB GPIB... They are very impressive, come in a convincing cardboard box, all the paperwork is inside like expected, the device itself looks spotless.
Made in Malaysia printed on the box. You expect a "Ceryificate" inside the box, don't you?
Don't ask how I know... Mine is still labelled Agilent.
And yes, they normally work.
I might be tempted by one of these, so I can use GPIB on a modern computer rather than having to use an old bulky dedicated Pentium box... do you have a link to one of these adapters that I could check out ?
...But now comes a whole new misery: Each half of this duplex is connected to a different breaker. Thankfully, both on the same rail so no 240V differential, but I don't know of any GFCI outlet that'll do 2 circuits in one duplex.
I think I've had enough joy for one night; I'm going to bed.