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Test Equipment / Re: Putting higher frequency through a scope
« Last post by Richard Crowley on Today at 08:42:27 PM »
In the Beginners Sectiliston of this board is a listing (right at the top) for: "Oscilloscope Training Class (Long)"
Have you viewed that yet?  Did you understand the topics?  Recommended.

Most forums like this have well organized sections so you can look through them.
And they have a Search feature so you can look up  your question to see if it has been asked before.
While most of us are happy to answer questions, it becomes redundant for people to come here
and ask the same questions over and over again. So they have certain topics that many people
ask, which are permanently at the top of the lists. That is called making them "sticky".
They are the ones with a darker background which are at the top of each list.

I suspect that the answers to to most of your questions (and probable most of the
questions you haven't discovered yet) have already been asked and answered.
And they are just waiting there for you to read. You don't have to wait for us to respond.
Microcontrollers & FPGA's / Re: uC caching program parts to RAM
« Last post by Harvs on Today at 08:40:15 PM »
Interesting responses.  The Cortex M3/4 series is what I was really thinking about, and statically loading functions at start up.  Sounds like there's no point.

If the STM32F4 is no quicker from RAM, I wonder what processors they've been talking about loading to SRAM for speed.
Just want to say Thanks.  YES, I just finished the whole video today.  I always learn a lot from your video.
The MAX7219 could work. It has a LOAD, not a /CS function, which could work in your advantage. Connect only the second /CS from the controller to the MAX7219 LOAD pin. Leave the first /CS output unconnected. If there are no other (spurious) clock signals this should work latching the last 16 bits into the MAX.
Ultimately there are two types of content creators - those who appeal more because of just their content, and those who appeal more because of their personality and/or persona etc.
And of course those who have both.
If you have a channel long enough, you'll usually end up building up both eventually though, especially if you are on-camera.
I seem to have a foot well and truly in both camps, after all, why would so many people watch me open my mail, or do a several hour live show?
But in our industry someone like say Afrotechmods would be classic example of the former. e.g. he's never on camera, you don't even know his real name, and every video is a polished short no nonsense tutorial video cut down to the classic 5 minute attention span limit. And no hundreds of videos to really build up personality appeal, running gags, building audience rapport etc.
The audience just get the info videos and nothing more.

Nothing wrong with either approach of course, it's whatever you like doing. Mine was always a personal "video blog" style from day one. The risk was always though that if people didn't find me appealing, then the blog would not have grown like it has. So as far as lower risk goes, the polished Afrotechmods or Kahn Academy style how-to info-only video approach stands a better chance of success.
Microcontrollers & FPGA's / Re: uC caching program parts to RAM
« Last post by Jeroen3 on Today at 08:31:54 PM »
This becomes a issue when you exceed 50 mhz. for examples, the stm32f4 series runs 170 mhz with a flash prefetcher and 128 bit wide flash and thumb mode. This way sequential code runs fast. But as soon as you jump the prefetch is lost and you lose time.
But executing from ram is not faster for some reason.

With the nxp lpc4300 flashless series you can run about 50 to 70 mhz on external quad spi flash, but the full 200 mhz can only be used from ram. pay attention to which ram banks you use, since the arm I D and S bussed do not connect to all banks.
General Chat / Re: RTFM idiot!
« Last post by VK5RC on Today at 08:30:05 PM »
One really good review of an amateur radio transceiver, written by an EE ex HP, started with the paragraph to see if he could get it on air without looking at the manual.
While the marketing types want us to stuff up and buy more, these venues esp Dave are our opportunity to try and strike some sense into the final design!
Beginners / Re: Facing a problem with Dave's power supply design
« Last post by Rerouter on Today at 08:28:17 PM »
generic 3.3/5V isolated switcher, you hook the positive side of the output to ground and away you go with -5V,
Beginners / Re: DC to DC converter
« Last post by hotter on Today at 08:24:05 PM »
So I did it, though it was not that easy to fit phones battery in to the mouse, including mini USB and circuit... I used LM3671MF-1.2/NOPB, mouse seems to work ok with 1.2V.
But I have strange thing with MAX1555. When I connect usb the charging LED indicator goes on and off instantly it is even hard to see that. As I understand that means that the battery is not charging, because LED is off. Battery shows 4.13V. Is that how it should be? Does this mean I have the fully charged battery? Or does it mean that charging can not be done while DC to DC converter is working?
My schema:
General Chat / Re: New Member, Please introduce yourself
« Last post by jkf1000 on Today at 08:18:51 PM »
Hell to all, recently registered on the forum but have been watching Daves videos for a long while, My name is Karl and I live in Yorkshire right in the middle of the UK. I got into electronics as a teenager, but then got distracted by things like girls then wife, then kids and now grandchildren, but finally rekindling my initial interests.

My main interests are radio related projects as I hold a full amateur licence, but love building and fault finding.

Things have changed quite a bit over the years, but the basic theory and calculations are still the same. Learning fast and enjoying every minute off it.. Karl.
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