Recent Posts

1

Microcontrollers / Re: Memory model for Microcontrollers

« Last post by PlainName on Today at 09:30:24 pm »

When you only have 2K of RAM you don't waste it with the usage of malloc

Dynamically allocating storage can allow you to store more things than you have space for had you used static allocation. You just can't store them all at the same time, but that may be perfectly OK in the application. For a small micro you would probably have a combination, with dynamic memory being allocated from a block of statically allocated memory.

2

FPGA / Re: Analog video output with FPGA ?

« Last post by Jaunedeau on Today at 09:29:43 pm »

there won't be any framebuffer, the conversion will be done on the fly, without scaling (which would require only one or two lines of buffer, not a tull frame buffer)

3

Projects, Designs, and Technical Stuff / Re: Looking for PCB mount BNC plug

« Last post by thm_w on Today at 09:28:18 pm »

For hobbyist uses, tons are available on aliexpress:
https://www.aliexpress.us/item/4001045414672.html
https://www.aliexpress.us/item/1005003918622626.html

Another option is to use SMA through hole connectors, which are even more commonplace, and then a BNC adapter.

4

Test Equipment / Re: Cheap oscilloscope for checking mains power quality? Also logging equipment.

« Last post by adam4521 on Today at 09:22:28 pm »

The Schneider PM5110 mentioned by Adam4521 is 64 samples per second if I see correctly.

64 samples per cycle. But only for internal processing. You can’t read out individual samples.

5

General Technical Chat / Re: How does this stuff work?

« Last post by SiliconWizard on Today at 09:19:14 pm »

My guess would be that the 62nF disc is the piezo "speaker" - producing sound. The coil is probably there to be used with hearing-aids which have an induction coupling option.

Yes.

6

Projects, Designs, and Technical Stuff / Re: Looking for PCB mount BNC plug

« Last post by jwet on Today at 09:18:44 pm »

I ran into this problem a while back.  They are somewhat rare but not impossible.  I never found a reliable source for production but I was just making lab stuff and found a couple solutions.

One place they are used in twisted pair coax balun type transformers used for CCTV systems.  These are cheap enough that you can buy them from china and take the bits you need.  See photo.

I also made a few adapters from BNC T's and L's and a few minutes with a dremel tool.  Don't have a great picture but attached what I could.

Below is a quick picture of both. Top is label from bag that Balun, left, came in- MC Electronics is a low tech electronic distributor in the US but these can be found elsewhere.  Right is a little project that has a 20 Mhz crystal and an NE-602 mixer that was a receive converter to get 162 Mhz Weather on a 2M radio.  I've used it for years and its pretty beat up.  9v battery on clips and BNC directly into radio- carved the adapter with dremel wheel to expose center core and outer cylinder.  Soldered up pretty well 

7

Jobs / Re: Contract Job - EEVblog: Making Shorts/Reels

« Last post by SiliconWizard on Today at 09:16:53 pm »

Your post about the contract job opportunity at EEVblog is like music to my ears! It's fantastic to see opportunities like this pop up, especially in a community where talent and expertise are valued.

Uh huh.

8

Projects, Designs, and Technical Stuff / Re: Brinking Light pattern for maximum attention distance at night

« Last post by Benta on Today at 09:16:16 pm »

"Mr. President, when was your last election?"
"This morning, just before bleakfast."
 

9

Test Equipment / Re: Another DSO+DMM - Zeeweii DSO3D12, claimed 120MHz/250MSps (june 2023)

« Last post by wasedadoc on Today at 09:13:34 pm »

I just discovered an undocumented feature on this little instrument.

If you go in into the FG via the "Gen" button, you are limited to 5MHz on sine wave, as per the specifications.  However if you go into the full-screen FG via the "Home"   menu (short press the power button) you can get the sine function at 10MHz!! 

This is with the latest firmware.

I have also verified the new frequency counter is good from 15Hz to 35MHz - well beyond specification.

That undocumented feature is not confined to the latest firmware.  Also present in mine which does not have the frequency counter.

10

Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by KungFuJosh on Today at 09:12:42 pm »

If cost is a dominant concern, then there are much cheaper alternatives than 8bit scopes.

You can get a 2 channel 12 bit scope for $390, or 4 channel for $440. True, for some that price is too high, and they'll stick with less expensive 8 bit scopes. But that's a pretty small percentage on the grand scheme of things.

Only a few people are TE addicts

A few what? Million? 🤣

I don't know how many people are on this site, but I know a lot of them are either addicts, or they're addicts in denial. 😉