Recent Posts

1

Repair / Re: Help repairing Klipsch KDA amplifier power supply and identifying smd component

« Last post by r2digital on Today at 07:50:46 pm »

this is great, thank you! I do believe FDC655BN is the part

2

Test Equipment / Re: new killer scope in town - a true game changer from R&S - RTB2002 & RTB2004

« Last post by Darkover on Today at 07:45:00 pm »

I did not know that there was a kind of RT-ZP03 with 1x/10x switch, but is using this kind of probe not a
pain in the ass with a scope that can not autodetect the switch position?
There are very few reason why you should need a 1x probe with the limited bandwith on a 300Mhz scope with 12Bit.

> and all three waveform adjustments are now inside the small enclosure at the BNC connector.

I think that means your probes are the older type. The newer type has only two adjustment. The
third one is hidden behind the sticker.

> Nonetheless my last Rhode and Schwarz purchase.

I can understand. This company was always good in asking high price, but they became now bader in delivering a value for the money.
If I pay for a mercedes I like to drive one and not a beetle. (no 50R termination, no probe detection, fat probes)

Olaf

3

Test Equipment / Re: SDS800X HD Wanted Features

« Last post by tautech on Today at 07:44:17 pm »

I wonder how many use these buttons.

Any advanced user with some active Math channels.

4

Repair / Re: Rigol DP712 Output Shorted; Fuse? / I Screwed Up

« Last post by macboy on Today at 07:38:43 pm »

The Thyristor (SCR) is part of the over-voltage protection circuitry. It is designed to protect the device connected to the supply from excessive voltage. Various things could cause over-voltage including failure of the power supply's regulation, but the protection works the same in all cases: when excess voltage (over the user-programmed limit) is detected, the SCR is triggered, which essentially shorts the output. Usually, when the power supply itself is the only source of energy at the output terminals, this is OK. When a high energy battery is connected, this is not OK!

5

Test Equipment / Re: Siglent SSA 3021X... Ooops

« Last post by tautech on Today at 07:37:17 pm »

Something very strange happened.

When I did the sweep, the SA barked at me with an overload.

I need to look at this more and make sure I'm not chasing bad data.

Good.
After a Preset all previous settings are set to factory and the analyzer attempts to protect itself.

Some wrongly use Manual attenuation to correct for external attenuation when instead they should shift the Ref Offset for Markers to display the correct level.
When set to Manual the analyzer is locked out from automatically managing its internal attenuation that varies with settings used.

6

General Technical Chat / Re: Is LinkedIn worth keeping?

« Last post by coppice on Today at 07:36:56 pm »

I had one headhunter phone my present day employer for a reference  The boss was freaked out of course. That was awkward - I phoned the recruiting company and flamed the manager, for hiring total bimbos. Headhunters are generally stupid and sharks that are only after the placement dollars and collecting candidates. I have a friend in that business and she tells me the stories. It's basically desperation to pimp you out, by people who have no idea about the technical skills names, meanings etc.
Within a headhunting company, they routinely backstab each other and steal candidates.

When you find an ex-engineer working in recruitment its such a wonderful experience. Most recruiters aren't just limited by their own understanding, they aren't even trying.

7

Beginners / Re: Fast PWM IC

« Last post by langwadt on Today at 07:36:26 pm »

Frequency.

and how many bits of resolution?

8

RF, Microwave, Ham Radio / Re: NanoVNA Custom Software

« Last post by joeqsmith on Today at 07:34:35 pm »

Prompted by a viewer, finally compared the lastest LiteVNA 64 hardware with the previous version.  Looks like they made a few hardware changes.

9

Beginners / Re: Need a (slightly) random signal ? Hers an idea, using CDS light sensor.

« Last post by RJSV on Today at 07:31:38 pm »

Here is a daytime view, of the solar garden lamp, with simulated yellow 'candle flicker'.

10

Test Equipment / Re: RIGOL DS1102Z-E

« Last post by trmntr on Today at 07:29:54 pm »

As a result, I installed this encoder from the link below.  Fits very well.  Both in height and in work.

https://aliexpress.ru/item/4000914884857.html