@xssfox
Isn't that technically a datum?

So setting the si5351 to 5.0000 Mhz and feeding that back into the arduino , along with 1 pulse per second from a rubidium clock I just have lying around allows me to log frequency and temperature - leading to this chart. I basically just let the 'oven' warm up and then cool down several times
Although the freq vs temp for an AT cut Xtal is ultimately part of a cubic function, this portion seems pretty linear.
#electronics #18B20 #tempco

So an 18B20 glued to the Xtal of an si5351 clock module reads pretty constantly at around 30C in a room with ambient temp around 22C. That's a bit of a surprise, but I guess it shouldn't be as the si5351 is probably dissipating about 100mW into the board.
#electronics #18B20 #tempco

Regular London Datacentre visitors:

Did you know the Silvertown tunnel requires you to pay?

I did not. I do know now. £90 penalty.

@xssfox
My response to the trolley-bus problem is that a trolley-bus doesn't have tracks and can steer.
A trolley bus is an overhead powered electric bus, not a tram.

@philip
Following up after some time delay....

There's a Brumby's in Bridport st, South Melbourne.
Interestingly the branding is green while the Sandringham one is red. Not sure whats going on there.

Then I wondered: Can you actually reprogram a character while it is being displayed? Like you may expect in such an old chip, the #HD44780 does *not* latch the customized character anywhere. Instead, every time it scans out the characters to the LCD, it reads the bitmap from RAM again.

That means that if one of the customized characters is in use, it updates immediately on the display when changing it via the parallel #Programming interface.

I don't think anyone has ever these displays to show a 40-band live spectrogram of the music playing on their laptop, but I did now.

3/3

#Electronics #DIY

@RueNahcMohr @synx508
I'm still trying to figure out why you would have two sets of segments in quadrature rather than just offsetting the sensors?

@X31Andy I like light bulbs for stabilisation, but you end up with the op amp driving a 270 ohm load.I just accept the higher distortion, with a 5532 I can get about. .006% which is pretty close to the limits of what I can measure.

@bloor
Sometime the tool you need IS a bigger hammer.

@synx508
That box is clearly labeled 'New Components'

@RueNahcMohr
If you mean averaging the voltage from the photo diode to use as a reference, its a trick Ive used a few times. Most recently converting an IR proximity module to use as input for an optical tachometer.

@TicklishHoneyBee Too much mashed potato? Impossible!

@cazabon Dont feel bad, I once managed to stick a soldering iron up my nose. Not entirely sure how I managed that.

@xssfox
Many decades ago, when I started working in a telephone exchange, I was given the beginner job of putting a new 1/4" plug on a soldering iron lead. (1/4 " plugs were used for power, not audio). I neatly crimped terminals on the wire and screwed the cable into the plug, then realised I hadnt put the shell on the cable. I pulled it apart, threaded the shell on and reterminated everything.
It was at this point I discovered that exchange 1/4 plugs have the shell slide on from the front!

@damonism @futzle
Im assuming I'll have the advantage that no one else knows how to pronounce it!

@damonism @futzle

psephologist - a new word to add to the vocabulary. The next few weeks will be a great time to give it a spin in casual conversation!

@synx508
I miss my 10base2. It may have been slow but it was quiet (er).

@acawley
Id say that uf504 has been replaced before. It could have been from a different batch in manafacture, but probably unlikely.
Does that one get hotter because its so close to a heatsink?

@tubetime @RueNahcMohr
The trick is to collect stuff when it's old enough to be boring old shit no-one wants, but not old enough to be retro-cool.

And to have infinite storage space!