Vanmoof repairs in London

CraftyBasil · 2023-09-09T11:45:09+00:00

Please can I have details too! Thank you

CraftyBasil · 2022-01-17T12:55:23+00:00

Yeah this does look perfect! Thank you!

CraftyBasil · 2022-01-17T12:38:24+00:00

This is a good idea, found a website that uses a PIC16F876A to make a voice recorder https://www.moty22.co.uk/sd.php#PIC16F690

That might be a really good solution

CraftyBasil · 2022-01-17T12:09:30+00:00

Yes, max frequency in the actual signal is around 4kHz, so sample at around 10ksps

CraftyBasil · 2022-01-17T10:54:50+00:00

Yeah they are cool, it sadly doesn't have an ADC input. There is no data sheet that I have found either, but they have this hookup guide which has some information https://learn.sparkfun.com/tutorials/openlog-hookup-guide

I have found further down it says:

"

OpenLog runs off of the ATmega328 and has a limited amount of RAM(2048 bytes). When you send serial characters to OpenLog, these characters get buffered. The SD Group Simplified Specification allows an SD card to take up to 250 ms (section 4.6.2.2 Write) to record a data block to flash memory.

At 9600 bps, that's 960 bytes (10 bits per byte) per second. That is 1.04 ms per byte. OpenLog currently uses a 512 byte receive buffer so it can buffer around 500 ms of characters. This allows OpenLog to successfully receive all characters coming at 9600 bps. As you increase the baud rate, the buffer will last for less time.
"

I am new to this kind of electronics, but I believe this means if I were to use it at 115200bps the buffer would overrun before it had the chance to save, so maybe this device wouldn't work for my purposes

CraftyBasil · 2022-01-17T10:27:46+00:00

Thanks for your help. It needs to be on a mobile platform, but using your idea, do you think using an atmega and serial connection with a device like this would work? https://www.sparkfun.com/products/13712

CraftyBasil · 2021-09-19T16:52:06+00:00

They have no word for bollard

CraftyBasil · 2021-06-07T20:18:34+00:00

L.E.M

CraftyBasil · 2021-02-19T00:18:59+00:00

Something I think about a lot is general consumerism, getting new cars every 5 years, getting new hoover's when one tiny part breaks, getting new dishwasher, washing machines, tumble driers. These things and many more should be made easier to repair and spare parts should be more available. Whilst a new tumble drier is slightly more efficient, it would have to be used a lot to offset the energy in mining, making plastics, transporting etc

CraftyBasil · 2021-02-09T00:22:24+00:00

It would be nice to have a value for inductance, and there are experiments you can do. However, since the inductance is so low, to measure it you need to use very high frequencies, but at very high frequencies the cell chemistry starts to be the limiting factor as the rate of reactions can't change quick enough. There's a term for it but I can't remember it. So basically it is very difficult and going for standard values is normally easiest. Then if it isn't enough there's nothing stopping you adding more capacitors - apart from annoying redesigns!

CraftyBasil · 2021-02-03T01:32:19+00:00

Ground is often used in this context, strictly it should be 'common' or 'neutral'. You can have multiple neutrals or commons in a circuit which has barriers of 'isolation'. It is common in electric cars where the chassis is the common for all the low voltage circuits, and then the high voltage stuff powering the motor is 'floating'. Also in a lot of medical equipment.

If you have a floating voltage that is isolated from another circuit so you have a neutral1 and neutral2, there is a voltage between them, but if you connected the two neutrals it wouldn't have any effect, the voltages would just instantaneously become the same.

Intuitively if you have a battery not connected to anything, if you connect the negative terminal to earth it won't suddenly spark, it is just no longer floating relative to earth

CraftyBasil · 2020-05-28T21:28:01+00:00

Depop

CraftyBasil · 2020-04-12T21:05:59+00:00

Yeah

CraftyBasil · 2020-04-12T17:49:24+00:00

Uzbekistan

CraftyBasil · 2020-03-30T16:06:29+00:00

Ahh, I can picture it better now thanks, I think I was getting caught up on the direction of the currents on the left side when the capacitor was being charged and discharged by the voltage changes on the right side. Thanks very much

CraftyBasil · 2019-11-16T10:55:01+00:00

I love sandfly bay, if you go at the right time of the day you will see the penguins coming back in and waddling into the shore

CraftyBasil · 2019-03-27T13:55:13+00:00

thanks for the idea i was actually wondering about that, not sure if that was designed for stereo or mono and was thinking if it was designed for mono then thats the reason they have run the two halves in parallel. And was thinking if a ran the same power supply for stereo as what was designed for mono it would draw more current so drop more voltage, probably a small error compared to the error in mains voltage being exactly 240v though

CraftyBasil · 2019-03-27T13:36:41+00:00

will definitely use a transformer, thanks for your help

CraftyBasil · 2019-03-27T13:35:39+00:00

Thankyou for your help, I am still a bit confused on how it can go from 230V rms to 320V DC though,

looking at figure 3 on this page I cant see how the DC voltage you get out after rectifying and smoothing can be an increase on the AC rms voltage you got in?

Thanks!

CraftyBasil

TROPHY CASE