Recent Posts

Pages: [1] 2 3 4 5 6 ... 10 Next
1
Other Equipment & Products / Re: Lets see your Nixie Tube equipment
« Last post by Dave Wise on Today at 01:40:46 am »
Oh you gave me a pain.  In my 20's I had a complete working Wang 360SE system including a CP-1 card reader and one of the keyboards was a 360KT trig model.  I gave it away.
 https://www.oldcalculatormuseum.com/wang360.html
2
Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by Mechatrommer on Today at 01:40:38 am »
A "mini-lathe" or "mini-mill" are rightly regarded by the professional as toys compared to the 250K 8,000 lb. behemoth - but those "toys" may be the far better choice for the hobby user, and the hobby user might actually be producing superior work - in terms of precision, or in terms of beauty, or so on - because that is what the hobby user is focused on, without being constrained by the demands of the clock.
I disagree with this analogy. Professionals look for quality, size is not relevant in that way.
from what i observed, not everytime. pro usually look for time saving, quality maybe "okayish" or "acceptable", but anyone who look for quality will need more time. this what imho make apart name like Porche or Lamborghini with like Ford or Tesla.

I am genuinely struggling between the options. If I had more experience, I would have a better idea of which things I might regret the most if I went with this one vs.
to make it simple, from demonstration made here, if you want a better scope (only looking at, analyzing and debugging signal traces) sds800x will be better. but if you think you want to expand your scope into basic MSO mixed signal and AFG with bode plot (and LA probe ready) at cheap cost (people are working on it. not so easy with siglent), and can accept the fact that you need to probe frequency at lesser or equal to Sr / 2.5 at any configuration, then its dho804. at full channel on and MSO, 156.25MSps meaning to probe 62.5MHz signal. without LA turned on, 312.5MSps ie 125MHz and so on... with sds800x, all 4 channels on, 500MSps ie 200MHz, but if you want to add LA, prepare to pay another half or more the scope's price... want to add bode plot? another half or more the scope's price. we are looking at 2-3X the scope's price if we need full MSO+AFG capability...

during ds1054z age, the choice is easy, even though not easily hackable to full MSO+AFG, but siglent's cheapest price is still 2-3X the rigol's price, so its quite no brainer, but now, its quite challenging not just for you. a piece of advice, please stick to your topic, dont think about getting used ds1054z because its not 12bit, so we have to be clear about it. and you'll risk non 100% functional used scope or short lived one only for saving like $100 or so? you can end up spending more money in the end... cheers.
3
Beginners / Re: How Current Limitation is happening in the circuit???
« Last post by ommsiva on Today at 01:39:46 am »
Sir,

I will check whether they are parallel.

i had 10ohm 50watt. i had an idea of keeping 20V output and check.

thank you.
4
Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by Harrow on Today at 01:36:27 am »
I WILL make a choice, and soon ... but first I'm still wading through some of the lengthier threads to try to get a better feel for how each machine would be to use.

"In ancient Rome, there was a poem
About a dog who found two bones
He picked at one, he licked the other
He went in circles, he dropped dead."

- Freedom of choice, DEVO, 1980.

Don't take too long, LOL.  ;D
5
PCB/EDA/CAD / Re: JLCPCB alters soldermask without any notice
« Last post by Smokey on Today at 01:35:20 am »
About the paste layer:
One thing to be careful of is that JLCPCB will make a paste stencil using whatever you give them on your paste layer.  So if you don't have your apertures right, they won't fix it for you.  This is a bit of a shock, especially if you only have outsourced stencils to assembly CMs previously.

They can and do change paste layers. I know, because they did it to one of my recent stencil orders. Changed the shape of pads on my QFN and FFC for no apparent reason (from rounded corners to completely circular ends).

As I understand it, they universally apply "solder beading treatment" (adding notches to pad apertures of 0805 and larger parts), and will tweak aperture sizes according to the stencil thickness (which they choose unless you specify). And if you don't include a paste layer at all, will make it from solder mask layer.

So no, JLCPCB don't make stencils 'as-is'.

True.  I should have been more specific.   
They might change your paste layer to make it easier for THEM to make the stencil, but they won't change it to fix obvious mistakes you made in aperture size or shape.
6
FPGA / Re: Hyperram to MAX10 (with no DQS shift)
« Last post by LootMaster on Today at 01:28:30 am »
BrianHG, I am ready for our chat, I got a product that can be unleashed by a guy like you, we split 50/50. or more like, you get what I get.

Because I like you.

please answer this
7
I placed a stopwatch in front of my scope's display.  Connected to a RF generator set to sweep from 5M - 100M.  Very small data set.  Norm trigger.  All processing turned off.  Camera set to 1000fps.   Recorded for 1sec.  Manually counted each screen update.  I measured a pathetic 30fps.  It's an 18 year old PC and based on how poorly it handles the X-Y music, not surprised.
You may also been able to extract that info from the OS display refresh rate settings if you can stop the boot before the scope app loads.
Windows reports 60Hz refresh but they appear to refresh at half that. 

***
Just to add more detail, I can zoom in to say show only 25 data point on the screen, show dots rather than lines, it seems to top out at 30.   Member Wuerstchenhund had log ago suggest I swap out the CPU stating some significant performance gains.  I don't believe they ever provided me with any data and I have never tried to swap it out.  Maybe it would improve the refresh. 
8
RF, Microwave, Ham Radio / Re: Dielectric insert tool for RG405 SMA plugs
« Last post by shabaz on Today at 01:19:53 am »
Personally I hate using such connectors and would rather pay more for the connectors that don't require dielectric insertion (e.g. Amphenol 901-10708 could be used) but if it's large quantities that could get expensive.

I have a dielectric insertion tool part code 2098-5214-02. Unfortunately, I cannot tell what could be different about it compared to the one you're looking for.

If that part code is usable for you (e.g. if there are low-cost connectors that use that part code instead), I can measure it with calipers and provide the dimensions.


9
Beginners / Re: How Current Limitation is happening in the circuit???
« Last post by xavier60 on Today at 01:19:06 am »
Sir,

Second time.

It was working well with 0.33 ohm 10watt.

Now 470 ohm got smoke.


Thank you
Is the 470Ω the resistor in parallel with the CS resistor?
The 0.33Ω resistor you mention is the CS resistor?
What load were you testing with?
10
Buy/Sell/Wanted / Re: 25MM Thermal camera IR lens wanted
« Last post by Hazel on Today at 01:18:59 am »
Hi,have you found the right lens?
Pages: [1] 2 3 4 5 6 ... 10 Next