Home
Help
Search
Login
Register1
Test Equipment / Re: Looking for a replacement general purpose oscilloscope for home use
« Last post by Martin72 on Today at 09:25:16 am »I would also be interested in the reasoning behind this.
Recent Posts
2
Test Equipment / Re: Siglent SDS3000X HD and upgraded SDS1000X HD
« Last post by Martin72 on Today at 09:21:59 am »QuoteMy SDS3034X HD arrived today (ordered April 3 via Siglent NA rep).
Still no sign of my order - and I had already pre-ordered in January.
At least someone has now received one.
Hello,
I hope that it will work out for us this month.
Best regards
egonotto
Postponed again, to the end of April.
I'm not going to ask anymore.
3
Beginners / Re: How to model piezo buzzer using LTspice
« Last post by jj5 on Today at 09:16:59 am »Thanks for your help with this.
I found a datasheet for a similar component here: https://au.mouser.com/datasheet/2/1005/202005110dd2c-2325130.pdf
It lists the capacitance as 25nF, which stacks with my observations from my component tester. It also says the resonant frequency is 3.0 ± 0.5 KHz and the resonant impedance is 500 Ω (max).
I found lib/sym/Misc/xtal.asy in my LTspice library. It models the piezo buzzer as a capacitor. It has settings for series resistance/inductance and parallel resistance/inductance, but no provision for nominating resonant frequency. If I know the frequency (3k, as above) can I calculate a series/parallel inductance? Do I put in the resonant impedance of 500 Ω as a series resistance?
I found a datasheet for a similar component here: https://au.mouser.com/datasheet/2/1005/202005110dd2c-2325130.pdf
It lists the capacitance as 25nF, which stacks with my observations from my component tester. It also says the resonant frequency is 3.0 ± 0.5 KHz and the resonant impedance is 500 Ω (max).
I found lib/sym/Misc/xtal.asy in my LTspice library. It models the piezo buzzer as a capacitor. It has settings for series resistance/inductance and parallel resistance/inductance, but no provision for nominating resonant frequency. If I know the frequency (3k, as above) can I calculate a series/parallel inductance? Do I put in the resonant impedance of 500 Ω as a series resistance?
4
General Technical Chat / Re: Cheapest way to get date/time from GPS
« Last post by nctnico on Today at 09:12:31 am »In Germany we also have DCF77. The advantage with GPS is availability of cheap and easy to use receivers. To make a good DCF77 receiver with similar accuracy one probably needs a rubidium local oscillator, so it can't be competitive.DCF77 will never get you an accurate clock like GPS as DCF77 doesn't / can't compensate for varying propagation delay through the atmosphere and other interferences.
5
Beginners / Re: buying a oscilloscoop
« Last post by Aldo22 on Today at 09:09:02 am »@scroeffie: In your price range there is only one (new) benchtop scope with 4 channels afaik. The Hanmatek DOS1104
https://de.aliexpress.com/item/1005006329135606.html
I have no idea how good or bad it is. There don't seem to be any useful reviews on the web.
Other than that, under €250, almost the only one worth mentioning is the Hantek.
I would take the simplest model DSO2C10 at the cheapest price.
e.g. here: https://de.aliexpress.com/item/1005006809075280.html
Seriously better benchtop scopes are only available from about 400 € upwards.
There are of course other types, such as USB scopes, handhelds, scopemeters, "toyscopes" etc. I don't know if you are looking for something like that?
Or second hand.
https://de.aliexpress.com/item/1005006329135606.html
I have no idea how good or bad it is. There don't seem to be any useful reviews on the web.
Other than that, under €250, almost the only one worth mentioning is the Hantek.
I would take the simplest model DSO2C10 at the cheapest price.
e.g. here: https://de.aliexpress.com/item/1005006809075280.html
Seriously better benchtop scopes are only available from about 400 € upwards.
There are of course other types, such as USB scopes, handhelds, scopemeters, "toyscopes" etc. I don't know if you are looking for something like that?
Or second hand.
6
Beginners / Re: good/cheap headphone aplifier/dac?
« Last post by radiolistener on Today at 09:02:18 am »look for Chinese 384 kHz 32-bit DAC USB adapter like CX31993 or ALC5686.
It cost about 3-6 USD and has pretty good sound quality.
It cost about 3-6 USD and has pretty good sound quality.
7
Repair / unknown DC-DC chip of SI-9110 differential probe
« Last post by teatime on Today at 09:00:43 am »Hello all,
Right now I have a defective SI-9110 differential probe,
Input 6Vdc,
the problem is no -12V, +12V is normal.
I checked the waveform of Pin15, the PWM of +12v as attachement.
But Pin 10 no any waveform.
If using external -12v instead, this differential probe works properly.
So the only problem is the DC-DC chip.
But the factory erase all chip mark.
I have draw the schematic of this part,please see the attachement.
The length of this chip is 1cm.
The bottom marked"NBK" and have a "Philippines" mark.
I hope some one can tell me the model of this chip.
Maybe this chip also used on other type differential probe.
Thanks & Best regards
Right now I have a defective SI-9110 differential probe,
Input 6Vdc,
the problem is no -12V, +12V is normal.
I checked the waveform of Pin15, the PWM of +12v as attachement.
But Pin 10 no any waveform.
If using external -12v instead, this differential probe works properly.
So the only problem is the DC-DC chip.
But the factory erase all chip mark.
I have draw the schematic of this part,please see the attachement.
The length of this chip is 1cm.
The bottom marked"NBK" and have a "Philippines" mark.
I hope some one can tell me the model of this chip.
Maybe this chip also used on other type differential probe.
Thanks & Best regards
8
Test Equipment / Re: SDS800X HD Bugs/Wanted Features
« Last post by tautech on Today at 09:00:00 am »Serial decodingGood suggestion for the entire platform range and one I believe could be accomplished quite simply by adding a menu View (type) option in the Decode List comprising of a Bytes or Frames choice, Bytes being the current list default view.I do a lot of RS485 serial decoding on an SDS2000X HD, and one of the things I miss that the older R&S RTB2004 it replaced had was the ability to show the entire "message" as a single frame/packet, and not as single bytes in a list, like the Siglents does it.
https://www.eevblog.com/forum/testgear/siglent-sds2000x-hd-12bit-(published-for-chinese-domestic-market-only)/msg5270949/#msg5270949I've been an R&S RTB2004 user for several years but decided to buy an SDS2000X HD to use as a secondary scope.
I liked it better than the RTB2004, so the Siglent is now the main scope. And after 3D printing that VESA mount for it, it's such a convenient instrument!
However, one thing I haven't figured out is the UART bus table.
I do a lot of half-duplex RS485 decoding, and with the RTB2004 it would display each "frame" (burst of characters) on a single line in the table. The Siglent on the other hand, just places each character on a new line in the table, and I end up having to fiddle a lot to compare two received "frames".
Is there a way to have the bus table look like the RTB2004 that grouts the received data in "frames" rather than filling a list I must scroll through?
electronics hobbyist, can you add the following feature to the list as well? I have an SDS2000X HD at work, and I've ordered a 1000X HD to have at my bench at home, but this (missing) feature I'm pointing out applies for the entire Siglent lineup AFAIK, at least the 800X HD, 1000X HD, and 2000X HD. I know many other manufacturers do it exactly the way Siglent does it, but that doesn't mean it could have been done better!
There certainly is sufficient room in the Decode Lits menu to add a View header with Bytes and Frames as the pop out choices.
In addition just the List headers would require modifying for a Frame view labels.
See screenshot and suggest where a new View (type) header should be added.....IMO directly below Display.
9
Projects, Designs, and Technical Stuff / Re: ANITA MK IX Restoration
« Last post by Haenk on Today at 08:57:39 am »I never dared to fire up my Anitas (yes, several models, all sold now).
Essentially, almost all parts can and do go wrong in these machines, so it's almost the best choice to check every single component. The wicked semiconductors are known for their high failure rate, so prepare to "re-create" a couple.
Essentially, almost all parts can and do go wrong in these machines, so it's almost the best choice to check every single component. The wicked semiconductors are known for their high failure rate, so prepare to "re-create" a couple.
10
Test Equipment / Re: Looking for a replacement general purpose oscilloscope for home use
« Last post by 2N3055 on Today at 08:51:07 am »
But: I would not (yet) consider their 6000 and 7000 series as a serious option.
Friendly regards
Could you elaborate why, if you are willing to?
What is making you say so?
Thanks and best regards,
Siniša