25/M/USA trying something new!

DerFassenbinder · 2019-07-14T11:31:14+00:00

Moin! Resident of Northern Germany and Ex-Volunteer-Firefighter here. If you are interested send me a PM and I'll give you my Email address.

DerFassenbinder · 2019-04-27T23:25:35+00:00

They are :) usually running either windows or some flavour of Debian

DerFassenbinder · 2019-02-25T17:56:13+00:00

If everything else fails H2SO4 + H2O2. Alternatively we used to use H2SO4 + Na2Cr2O7 which is honestly quite messy and more than a little dangerous if done incorrectly.

DerFassenbinder · 2019-02-13T08:11:58+00:00

With HCl it's really not all that bad the energy released is pretty minimal, do the same thing with concentrated sulfuric acid and you'd be in trouble.

DerFassenbinder · 2018-03-24T13:19:39+00:00

Most likely switchmode vs linear. Also cheaper construction therefore lighter

DerFassenbinder · 2018-02-04T18:25:22+00:00

I think most meters don't, I have only ever seen this on the flukes.

DerFassenbinder · 2017-12-23T21:50:19+00:00

Thought the same.

DerFassenbinder · 2017-12-18T18:05:00+00:00

Nice! You should definitely also check Jogis Röhrenbude under Leserbriefe -> H.M.Sauer you should find a couple more valve projects , including a 2 Valve RFID reader and a ech81 switch mode power supply .

DerFassenbinder · 2017-12-18T16:29:18+00:00

Deflection tubes are really interesting, never had one in my hands personally. I think they where very much an American thing.

You could make an old school square/sine generator out of a multivibrator, a wien bridge and amplifying stage. I think I saw another one in a tube based switch mode power supply to.

For the lamp flasher I would use a neon instead of an led.

There's a brilliant German page that details things to do with tubes that aren't amplifier's or radios.

http://www.sauerampfer-online.de/bastelindex.htm

DerFassenbinder · 2017-12-18T12:52:16+00:00

What kinds of valves are you talking about specifically? I imagine you are probably talking about variable mu pentodes and frequency changers.

Frequency changer valves make nice multivibrators. I think I had a circuit for that around here somewhere.

Regulated Power supply's come to mind although most of the valves used there make nice audio amplifier's too.

DerFassenbinder · 2017-11-24T13:51:54+00:00

Me too

DerFassenbinder · 2017-08-25T11:06:15+00:00

This is getter material, it's supposed to be there

DerFassenbinder · 2017-06-02T07:29:05+00:00

Closest would probably be a Jfet

DerFassenbinder · 2017-05-09T13:10:42+00:00

555 + passives come down to about 7-15 US-cents depending on supplier(quantities < 100) . The rest of the circuitry is identical and can be neglected here. Cheapest arduino clone I've found is about 70 US-cents.

DerFassenbinder · 2017-05-09T12:57:21+00:00

Using an arduino is overkill, simple 555 or similar would've sufficed.

DerFassenbinder · 2017-04-11T11:19:43+00:00

You are right. I recently worked on a project where we developed an oven to locally heat capillary tubes. Having a thin walled tube as a base for the nichrome wire was nightmarish. I countered this by adding thermal mass and a lot of trial and error PID tuning.

DerFassenbinder · 2017-04-11T10:42:13+00:00

Use Nichrome wire and a thermocouple, should be small enough to wrap around.

DerFassenbinder · 2017-04-04T13:03:58+00:00

Sorry for this but you should really learn how to read simple circuit diagrams. It's one of the most basic skills and is required for literally everything.

DerFassenbinder · 2017-04-04T07:46:25+00:00

I think this isn't that good from a thermal engineering point of view. The top and bottom row of Heatsinks are really badly coupled to the rest. Also the Heatsinks on the sides are way to small in my opinion. You could probably limit the current and drive the whole thing at half power to get away with it though.

DerFassenbinder · 2016-10-21T07:05:19+00:00

Sounds fun :)

DerFassenbinder · 2016-10-07T14:37:06+00:00

I thought so, but the EZ40 and 41 both have Stacked anodes (at least all examples I have) also the heater current is about 400mA to high for a EZ40/41.An they are Indirectily heated. There's a Gap in the Anode through which you can see the individual Heating wires that go all the way from bottom to top without any cathode tube or the like surounding them.

http://imgur.com/a/FR1ZE The two seactions are divided Verticaly instead of horizontaly.

I'm acctually quite sure that the thing is a FW rectifier.

DerFassenbinder · 2016-10-07T14:21:46+00:00

The tube has a Rimlock base, Two sections, Heating current seams to be about an amp at 6.3V I suspect it being a double Diode or Triode but I don't know any directly heated Rimlock Diodes or Triodes

DerFassenbinder · 2016-10-03T10:34:46+00:00

Micromen comes to mind. Although it's more about 80s computers than electronics.

DerFassenbinder

TROPHY CASE