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Other Equipment & Products / Re: Ersa Desoldering-Station
« Last post by jasom on Today at 10:15:04 am »Can be used i-Con 1 with x-tool and cu100a? or with chip tool desolder tweezers? Thank You
Recent Posts
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Projects, Designs, and Technical Stuff / Re: role of optocoupler for biasing drain of amplifiers
« Last post by john23 on Today at 10:15:00 am »Hello XVR, you previosly said DB02S2415A is also the bias source of hte amplifier.
now its the 24V?
Thanks.
now its the 24V?
Thanks.
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Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by Mechatrommer on Today at 10:14:22 am »iircsomeone stated dho800 only works on specific brand. i have few wifi adapter here, maybe later i will try. but still, its a few more steps to do... rather than plugin usb stick and hit capture button. ymmv.Cable? My WiFi adapter cost me $7...Screen capture over network still works even on an unsigned app.not everybody like to connect to network for a mere screen capture, i do it with usb stick. my ethernet cable is super long and its quite a mess trying to run it to my dso, at my lab setup, connecting to usb cable is much easier. and that luckily i have ethernet cable at all so i can do some adb hack albeit a bit inconvenience. ymmv.
BTW, speaking of signal integrity, the (unlocked) Rigol can more or less properly show signals at up to 500 MHz at 1.25 Gsa/s (the 2.5x ratio again btw), albeit with a greatly reduced amplitude, apparently because of the hardware low-pass filter on the input.this is +1 imho in rigol, lets not forget, the 2 scopes discussed here got pros and cons.
2n**55 only showed one successsful case at Sr / 2.27, but i bet anything lower freq than that will be better, the only thing is at when higher freq will start wobbly up to extreme 250MHz.In reply #465, 2N3055 showed stable reconstruction of a 220 MHz sine which was sampled at 500 MSa/s. So the SDS800X HD can still resonstruct properly at a sampling rate of less than 2.5x of the signal frequency, while the Rigol started to show wobbles at 3x or so.I'd like to see a frequency sweep.
The Rigol is applying the theory correctly and the Siglent can't possibly be doing an infinitely wide reconstruction, so...i havent seen that proven, in fact shapirus proved that otherwise. dont show too much of fanboyism, we trust more scientific facts rather than sentimental facts
we have saying/joke in our medsos group, if we have stupid in ourself, its ok, but dont reveal it too much 
no pun/insult intended cheers.4
Projects, Designs, and Technical Stuff / Re: role of optocoupler for biasing drain of amplifiers
« Last post by xvr on Today at 10:08:37 am »You need separate voltage source for it. It was labeled +24V in your first schematic
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Test Equipment / Re: Siglent SDS2000X Plus Hack
« Last post by gwideman on Today at 10:01:53 am »Just posting to thank those responsible for the script and other tips.
I will consolidate some notes that might bring other readers up-to-speed quickly without fussing around reading this entire thread:
-- SDS2104X Plus
-- Script: I used the one in message 409 of this thread.
-- Edit the script to change SCOPEID to the scope's id (from the Utility > System Info.)
---- Enter scope id in lowercase and numbers, omitting the dashes.
-- Run the script. [Note 1] It prints a list of keys
-- Visit the Utilities > Software Options panel, select an option in the drop-down list, enter the key for that option from the script output.
---- Enter the key in lowercase and numbers.
---- You might think you'd need to plug in a keyboard, but no need, a decent one appears on the touchscreen.
Other concerns:
-- Originally the scope was at firmware V1.3.something. In that state it accepted a key for one of the options (and the option took effect).
-- The scope was then upgraded to the now-latest released firmware, 1.5.2R3_EN
-- The scope retained the previously-set option.
-- The scope accepted additional keys for additional options.
[Note 1] The script is in Python language. You will need Python 3.something installed in order to run it -- free and easyish to install, but a burden if you have no other need for it. Alternatively, search online for a site where you can run Python code by just pasting it into a text box etc.
Thanks again fellow EEVBlogsters.
I will consolidate some notes that might bring other readers up-to-speed quickly without fussing around reading this entire thread:
-- SDS2104X Plus
-- Script: I used the one in message 409 of this thread.
-- Edit the script to change SCOPEID to the scope's id (from the Utility > System Info.)
---- Enter scope id in lowercase and numbers, omitting the dashes.
-- Run the script. [Note 1] It prints a list of keys
-- Visit the Utilities > Software Options panel, select an option in the drop-down list, enter the key for that option from the script output.
---- Enter the key in lowercase and numbers.
---- You might think you'd need to plug in a keyboard, but no need, a decent one appears on the touchscreen.
Other concerns:
-- Originally the scope was at firmware V1.3.something. In that state it accepted a key for one of the options (and the option took effect).
-- The scope was then upgraded to the now-latest released firmware, 1.5.2R3_EN
-- The scope retained the previously-set option.
-- The scope accepted additional keys for additional options.
[Note 1] The script is in Python language. You will need Python 3.something installed in order to run it -- free and easyish to install, but a burden if you have no other need for it. Alternatively, search online for a site where you can run Python code by just pasting it into a text box etc.
Thanks again fellow EEVBlogsters.
6
Projects, Designs, and Technical Stuff / Re: role of optocoupler for biasing drain of amplifiers
« Last post by john23 on Today at 09:57:34 am »Hello XVR,DB02S2415A outputs 15V voltage difference between the gate and the source of the mosfet(floating).
I need a solid 20V on the drain of the TGA2590 power amplifier with respect to the source of the power amplifier.
How the DB02S2415A does that?
Can you please draw so i could understand?
For the mosfet i understood the 15V difference floating ,but how it helps us put 20V with respect to the TGA2590 source?
Thanks.
I need a solid 20V on the drain of the TGA2590 power amplifier with respect to the source of the power amplifier.
How the DB02S2415A does that?
Can you please draw so i could understand?
For the mosfet i understood the 15V difference floating ,but how it helps us put 20V with respect to the TGA2590 source?
Thanks.
7
Beginners / Re: Analog Multiplexer-Demultiplexer Switch Vs Input Voltage
« Last post by 2X on Today at 09:56:23 am »For my opinion the ON Semiconductor’s datasheet is the most detailed. It clearly writes at the first table on the page 4 that Vis is the analog input voltage of the switches and the Vin voltage it corresponds to digital voltage (in respect to GND) and more precisely to control pins.
At page 10 the datasheet describes with an example the functionality of the chip. As I understand the logic level converter is referred in the function that with a positive digital signal (e.g. 0-5V) can controlled a Vp-p analog signal (e.g. +5 - -5V; with negative values). The logic level converter takes as input a digital positive signal and then creates on his output a proper signal in order to drive the gates of the mosfets/switches that are between each analog input/output.
Also, a very good detailed datasheet where is similar to 4052 is the 14052 datasheet.
P.S. If anyone understand the reason that at Nexperia's datasheet referred the term Vsw (or the Vsw is the same thing with Vis in essence?) and if there is any practical purpose of it... please tell it.
Thanks all of you for your replies and the help.
At page 10 the datasheet describes with an example the functionality of the chip. As I understand the logic level converter is referred in the function that with a positive digital signal (e.g. 0-5V) can controlled a Vp-p analog signal (e.g. +5 - -5V; with negative values). The logic level converter takes as input a digital positive signal and then creates on his output a proper signal in order to drive the gates of the mosfets/switches that are between each analog input/output.
Also, a very good detailed datasheet where is similar to 4052 is the 14052 datasheet.
P.S. If anyone understand the reason that at Nexperia's datasheet referred the term Vsw (or the Vsw is the same thing with Vis in essence?) and if there is any practical purpose of it... please tell it.
Thanks all of you for your replies and the help.
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Projects, Designs, and Technical Stuff / Re: role of optocoupler for biasing drain of amplifiers
« Last post by xvr on Today at 09:49:51 am »That is exactly DB02S2415A used for. You still need it to power floating side of schematic
It"s V1 in Spice model
It"s V1 in Spice model
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Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by shapirus on Today at 09:34:37 am »I'd like to see a frequency sweep.I second this.
@KungFuJosh can you please set the scope to 500 Msa/s, low waveform acquisition rate (to make the TinySA's glitches less visible), low persistence, and record a video of a 30 seconds long frequency sweep from, say, 110 MHz to 270 MHz?
Coax connection with a 50 Ohm feed-through terminator, if possible, to make the test conditions the same as in my test.
It will be interesting to see at what frequencies (and at what ratio relative to the sampling rate) it will become first wobbly and then AM-like (if it will), to compare that to Rigol.
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Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by ebastler on Today at 09:32:24 am »The Rigol is applying the theory correctly
When was THAT proven?
Rigol have repeatedly cut corners in their signal processing. The sampling rate vs. bandwidth mismatch has been discussed at length here; the very generous inter-channel skew spec, wobbly AC trigger, wonky FFT "resolution bandwidth", incorrect flat-top window function come to mind as well. I would not be surprised at all if they had not gotten the Sinc interpolation quite right.