Metropolitian

6 hours ago, Crossy said:

who remembers these (C) :-

 

I don't but it reminds me of the 4.5v batteries that has 3 cells in it and with a little hack you was then able to use the 1.5v and 3v from it.

In our country we had the brand 'White Cat'  , long gone.

But these 4.5v batteries are still available here and there.

I do still have one in a classic pocket torch (the one with colored slides) , still working after 25 years. Never replaced the battery.

I do remember another battery, which resemble very much the same size as one of the cell from this pack. With the height of a 'D' battery and width between the 'C' (not C as in radiobattery) and 'AA'.

Bit like the size of a cylindrical Lion cell but a tat bit longer.  Who know those?

And the 6v pack with springs on the top and 9v pack which was square (squared, not rectangle) with the same connection as the 9v still in use now.

Dropping Heater Voltage
The heater voltage should be kept within +/-10% of its nominal value for optimum valve performance. For 6.3V heaters that means 5.7V to 6.9V, though it is even better to stay within +/-5% if you can (6V to 6.6V). Many guitar amps suffer from rather excessive heater voltages. This is sometimes because mains voltages are higher today than they were when the transformer was orignally designed (this is common in the US where wall voltages have risen from around 110V to 117V today). Sometimes it is because the transformer is more powerful than it needs to be, i.e. it is not fully loaded so the voltages are not pulled down to their nominal values.

A nice page :  Link to Valvewizard site

And who are to blame?

Why 6.3 Volts?

In the early 1930s the Americans wanted to make in car radio possible, this also would have helped the military. The standard for car electrics at the time was a 6 Volt lead acid battery, and a freshly charged battery would have had a terminal voltage of 6.3 Volts. As mains transformers could generate any wanted voltage it was decided to standardise on a voltage that would also allow the valve to be heated from a vehicle battery.

6.3 Volts was adopted as the American standard for filaments and heaters in 1934.

The UK standard for mains valves had been 4 Volts, this too can be related to the lead acid battery as two accumulators in series would be 4 Volts. The accumulator used in the home would be run to near exhaustion prior to being taken to the local shop for recharging and therefore for most of its service live would give the 2 Volt terminal voltage associated with the lead acid cell.

In 1937 MOV went American, introducing 6.3V valves with International Octal (IO) base caps.

Mazda's response was to remain staunchly British but to reissue its range of 4V valves with Mazda Octal (MO) base caps, similar to but not interchangeable with IO.

The main move to 6.3V valves for British domestic receivers was essentially a 1940s phenomenon, spurred by the widespread manufacture, importation and use of improved 6.3V American types during WWII.

source: National Valve Musem , link.

1 hour ago, Jan Dietz said:

BTW 6.3V is not critical, it's just where it will have the longest life / correct heating. 

But as tubes are quite resilient you can get away with probably anything between 5 and 8 volts or so.

 

That's good to hear.

The one that I am using is 24-18-0-18-24 and 0-6-9-12. 

Using the 2x18 for another board in the same project and was hoping that I could use the 6 for the tube heater.

Just didn't try it as I wasn't sure if that voltage has to be precise, thanks to the decimal with tenths value.

I will try the 6 volt ac first, otherwise I can try to get the value near to the 6.3v by rectifying it with a few diodes.

^^ Splendid comments.

Although I wouldn't order those at Ali, shipping 30usd and above that all it are THOSE that i am finding in the store nearby (NPE/Nattapong) and they are right for big tube amps but too oversized/overkill for the project that I want do with the tubes here.

I only need 3mA with the HV.

The HV part I probably can make myself with a 555 ic, another vibrating trans (547) , winded core and fets. (DC-DC boost).

Or ordered, like this one:

But the big question for now is for the 6.3v. 

If that exact voltage is really needed, then I will go for the transformer as @Jan Dietz already mentioned, they cost around the 500thb and a ride to the store.

But I will be more happy if I can use one of the transformers that I have laying around here in the 'parts-drawer', but no 6.3v. in there.

One example use for the tube.

Tube is happy when supplied with 180V-250V 8mA for the electrons and 6.3V 0.3A for heating.

For those that thrived in the pre-hybrid age full on with vacuum tubes;   what is your experience/expertise on powering the tubes.

I have two tubes that I need to feed with 6.3v and 250v (DC).

Now I have checked at here and there. It's hard to find a transformer that has 6.3v output, and the one that has it are very beefy.

The 250v and to be isolated, depending on the current, theoretically should be easy made by two smallish transformers or an 1:1 (but hasn't seen those, only big isolation transformers) with a diode and resistor in series.

Practically I would end up with an transformer with multiple output (I need 2x18v anyway) which has 6.3 ^* (hopefully but ain't seen them much) and a smaller one to push up one of the output to 200v (which is sufficient for the tube).

^*Instead of the 6.3v, any other value near this is it accepted? (5v..)

Tube is 6e2.

http://iggoothailand.com/iggoo-fit-หุ่นยนต์ดูดฝุ่นที่ตอบ/

That is gumby the dumby going to the uni

The 'pleasant mishap' board is ordered , for the conveniently and the components that are already on that board.

I have bought a ex-showmodel 'dumb' vacuum cleaner robot to play with and that's where that board come in handy for activating it remotely -and- monitoring the battery status, as I needed something bigger with respect to the esp module. The relay removed from the board and some extra options. I will teach the robot going 'smart' .

The other tiny esp01(s) board those extra gpio ports are so small and hard to reach so I will keep them just for one function, switching one output.

^^^

I have a few of those modules, they are very useful and as you said easy to switch and flash.

The relayboard I had to modify to get it to work (esp won't boot) , one jumper and a pullup resistor  both done in once.

Removing the SMD 'pull down' resistor would work but I didn't go that way as after adding the 10k on the solder side it worked.

 _{______}

 |   o O o o

R  O o O o

 ^|--^/\---^/

10 hours ago, webfact said:

Several Thai research programmes are currently seeking a vaccine for the virus.

Consider work together? Oh..

I have seen pages which made my left brown frown.

But now I stumble on one, one which made both brow drop after they meet their maximum position.
 

https://shopee.co.th/โมดูล-Esp-8266-Relay-Wifi-10-A-220-V-Network-Input-Dc-7v~30-V-4-อุปกรณ์เสริมสําหรับคอมพิวเตอร์-i.163531172.2524921476

Reduction in the number of people: E/grade 8266

Colour: Green

Reduction in the number of people (Growing Broad Branches): 6540 Pleasant mishap

Wanted: 2.4 Persons with disabilities

Grade: + 225 dbm

Repeater voltage: 2220

Persistence Repeater current: 110a

Input voltage: ~ 30.

Protection from input over voltage: Yes

Import overflow protection: Yes

Characteristics: 1。 Chapter

Safe relay pin crawl design for the mercy b pin.

- adoption of e 8266 rampage., layer design 4.

- A status indicator for the male, an input status indicator light.

- 4. (For) 220 Positive 110a relays, one is often opened, a constantly closed.

- Light coupling input, tvs input protection.

- Access to the male server through the TCP cent mode through the mileage protocol control. High current terminal.

- Import over voltage protection, import tvs, when the voltage exceeds 333v, automatic protection function runs.

Notes: Manual measurement, please allow~5 errors, thank you.

Packaging included: 1 e.g. Pleasant mishap

A good laugh at some of those lines in the product description.

I opted, now they only need another 1.4 disabled people for this pleasant mishap. ????

On 6/11/2020 at 9:19 PM, RickG16 said:

Dude I think you are asking the wrong demographic on this forum ????

 

I'm not sure about that, right now

On 6/11/2020 at 11:26 PM, wilai said:

I'm off to bed with a headache after reading the answer to that last question!

But definitely learned from that

2 hours ago, swbaggies said:

I know the tackler is Andy Legg, not sure of the other?

Yes right !  And the other is an Romanian playing for one club in the 'large boot' country.

This morning finished watching the whole series of City Hunter (2011) , consisting of 20 episodes.

7 hours ago, champers said:

Ex Bolton midfield maestro Jason McAteer?

Along with Frank de Boer ????, in the European version of FIFA Soccer 96.

This was the first FIFA game to feature real-time 3D graphics using technology called "Virtual Stadium".

It was also the first in the series to present players with real player names and positions, with ranking, transfer and team customization tools.

Who knows who the two players on the cover of the 'international' version are?

I found that roughly the room in m2 divided bt two gives the btu in K not far off.

17 m2 room here has 9kbtu and 24m2 room has a 13kbtu aircon. Cooling good and they even get to their pauses.

21 hours ago, carlyai said:

I do have the Chinese manual, so scanning and online translations are in order too.

Double check your translation results , don't try to accomplish the same outcome as this

????‍♂️

The one with the lowest -and- stayed in were the West Brom in season 2005.

6 hours ago, Crossy said:

Ah, it seems we have a spot of wrong end of the stick grasping and it's my fault ????

 

I'm using the term "Phase" as in phase (stage) of the job rather than phase of a 3-phase supply, should have been clearer.

 

To clarify, it's a single-phase inverter on our single-phase supply, I'm not doing anything clever there.

 

And I've completed Stage-1a to this point, the rest of Stage-1 (filling up the roof with panels) is next weekend.

 

Stage-2 is currently not scheduled, let's see how we get on for a few months with what we have.

 

I was wondering this ????  First I read the 'Phase' as in the stage, as your intention was, but.. 1a is populating the carport roof, 1b was the inverter. 

That is where I had to change my understanding and changed it into a 3phase inverter

On 6/13/2020 at 10:26 AM, gamb00ler said:

Phase 1

• Fully populate the car-port roof with panels, there's room for 18.
• Install a new 6kW GTI.

6 hours ago, Crossy said:

Phase-1a is working

Then, it is a 3phase inverter and I am wondering how is the generated energy balanced over the phases?

All the energy divided by 3 for each phase? Or is is fast enough to pump charge the toroid 150 times (or three of them?) in a sec and delivering to all phases? Or just giving out to each phase sequentially?

I've monitored my inverter and it's dumping and charging each second. You can see that pattern with an analog meter or oscilloscope at the DC side.

Also, curious as what it does with the 'over-generated-power' on a phase is it going to waste or giving it to another phase.  (3 phase loads in the house with one of the phases using lesser then the generated power)

Anyone got a deja vu feeling here?

I did , and this is why.

????

Anyway; if the fridge can use two socket, nothing wrong with using another plug for only the green wire and keep the original plug intact.

I myself use a banana plug and stick it in the earth hole in the same outlet as the cable for the fridge, which is euro-plug, is connected.

9 minutes ago, champers said:

De Boer at Palace.

Correct. Frank de Boer. After 4 matches, all lost, and being manager for only 77 days, he was sacked and replaced by Hodgson.

Your turn Champ.

1 hour ago, StreetCowboy said:

I like to sit in the pub where I can see my bike outside, for (I fondly imagine) security reasons.  As if i’m going to rush outside and catch someone leaping onto my bike and pedalling off.

 

At least, having seen them, it might save me blundering about confusedly wondering where my bike has gone, later in The evening

Taking the saddle to sit with you in the pub, with the speed bumps and pot holes in the street, you can recognize them the way they walk, later after the evening.

Manager, signed a contract of 3 years but was sacked after only 450 minutes of gameplay.

1 hour ago, wilai said:

OK Here's one. The 'Spuni' spray used by refs to ensure walls remain 10 yards away at free kicks  was first used in which Professional League? 

In a Brazilian Copa two decades ago.
I remember we friends were joking about a friend of us that was playing and has a beard, saying to him bring a razor the ref will bring foam. Very silly and it was not widely used until a few years later at bigger games.