tubetime

7 ms·

31.
by tubetime 6y ago
Typically they are old devices that have been painted and re-marked to make them appear newer than they really are. Often they still work fine, but since they've not been retested, it's not guaranteed.
32.
by tubetime 6y ago
sadly it doesn't seem to be sprouting roots. oh well.
33.
by tubetime 6y ago
it doesn't have any snap action. the force is set by a spring so it's just linear. the sound is fairly quiet.
34.
by tubetime 6y ago
that's a cool idea!
35.
by tubetime 6y ago
dome switches are definitely cheaper, but i was comparing this design to mechanical switches. the magnetic switch has far fewer moving parts and the tolerances don't have to be very tight.
36.
by tubetime 8y ago
it sounds like he's trying to use a high density drive to image double density floppies, which isn't a great idea. far better to use the double density drive which has the correspondingly large read/write head so you get a be
37.
by tubetime 8y ago
this is the 1960 paper about ADALINE that discusses the memistor: http://www-isl.stanford.edu/~widrow/papers/t1960anadaptive.p...
38.
by tubetime 8y ago
it's not the Stereo F/X, it's a generic clone of a SB 2.0 sold under a dozen different brand names.
39.
by tubetime 8y ago
i did it for fun, and also because real sound blaster 1.0 cards are going for a lot of money on ebay. i don't actually own an original card, this was reverse engineered entirely from photos.
40.
by tubetime 8y ago
yes: http://www.malinov.com/Home/sergeys-projects/xi-8088 although it's a CPU card that plugs into a backplane. lots of other good designs of his here: http://www.malinov.com/Home/sergeys
41.
by tubetime 8y ago
alternative names i considered: SNOOD BLOOBER, SOUND BLUSTER, EAR BUSTER, SNART FARTER, SNUD BLUFFER, SNARD BLARGER, SNEED BLEEPER, SNORP BLORPER, SNOT BLOTTER, and SNOOT BOOPER.
42.
by tubetime 8y ago
there's nothing inherent in the design that could damage a motherboard. perhaps you're thinking of some other card?
43.
by tubetime 8y ago
the firmware is not the official one, it's actually from a Chinese clone. works fine with all the software i tested it with.
44.
by tubetime 8y ago
burning sulfur on a chunk of copper will also make you a memristor. interesting effect...
45.
by tubetime 8y ago
for all the gory technical details, the datasheet is available here: http://korgnutube.com/pdf/Nutube_DatasheetV1E.pdf interesting that they break the typical vacuum tube naming convention--the first number usually ref
46.
by tubetime 8y ago
for audio, Korg has a gallery of examples: https://korgnutube.com/en/gallery/ the tech uses the same manufacturing line as a traditional vacuum fluorescent display. VFDs are technically vacuum triodes where the pl
47.
by tubetime 8y ago
eventually you do get a square wave (similar to a transistor) but with less overdrive, you get a "soft clip" waveform that is rich in second harmonics. these harmonics are an octave above the fundamental, and can also create a psy
48.
by tubetime 8y ago
it works with a regular VFD as well! see https://twitter.com/TubeTimeUS/status/1061797427991068672 for a photo and the resulting waveform.
49.
Silicon die analysis: inside an op amp with interesting “butterfly” transistors(righto.com)
109 points by tubetime 8y ago|39 comments
50.
by tubetime 8y ago
my power supply is capable of 1KV at 10mA. it's the one piece of lab equipment i own that genuinely scares me. all this stuff has to be treated with respect. still though it's good for cool experiments with monoscope tubes. :-)
51.
by tubetime 8y ago
those are dangerous too--they output high frequency AC which can cause burns. with a thumb-sized CCFL supply i once burned a tiny hole in my finger. never bled a drop since the current cauterized it but it hurt for a week.
52.
by tubetime 8y ago
you've got to be very careful and never use HV without treating it with respect. i use the one hand rule extensively, keeping my left hand firmly tucked behind my back while the supply is turned on.
53.
by tubetime 8y ago
good enough for NTSC or PAL monochrome composite video.
54.
by tubetime 10y ago
this is correct. it'll probably be in the expo hall. the exhibit is called "Making Dis-Integrated Circuits", see http://makerfaire.com/maker/entry/55149/
55.
by tubetime 10y ago
well, it has to run on 5v (standard ttl voltage) so the only way to speed it up is to decrease the pullup resistor values, which also increases the current consumption. it's a tradeoff.
56.
by tubetime 10y ago
because it's NMOS, only the pulldowns can work quickly. the pullups are resistors (depletion mode FETs in the IC) which take some time to charge the downstream gate capacitance. i wrote a quick and dirty python program to calculate the
57.
by tubetime 10y ago
in a way, yes, but those 3 transistors do not affect the simulation. the drains and sources are shorted together and tied to a random data line. the gates are grounded. they just sit there, doing nothing.
58.
by tubetime 10y ago
we're considering it. see http://monster6502.com/ . there is a mailing list for those interested in such a kit.
59.
by tubetime 10y ago
the schematic capture and layout was done in Altium. proto board spin from a vendor in China.
60.
by tubetime 10y ago
https://twitter.com/TubeTimeUS/status/732023168303435777 for a photo next to a real 6502, and an IBM SMS card for good measure. :)

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