Tag Archives: Teardowns

Cheap UV EPROM eraser teardown and spectrum analysis

via Dangerous Prototypes

 

pics-EPROMEraser-600

Kerry Wong did a teardown of a cheap UV EPROM eraser and measured the spectrum of the UV tube using a monochromator:

Till recently, I have been using custom circuitry whenever I needed to backup some firmware. But the process was rather tedious as for each kind of EPROM or EEPROM I needed to study the protocol and timing requirements and then come up with the required circuitry on a breadboard. And wiring can easily become an issue with a high pin-count chip. So I finally got myself a proper EPROM programmer (it’s a TL866A) along with a $15 generic UV EPROM eraser so I could program EPROM/EEPROM’s quickly. While it was fun to build a programmer circuit each time, I think the effort can be put into something more useful.

More details at Kerry Wong’s blog.

Check out the video after the break.

 

Teardown and review of the new MHS5200A

via Dangerous Prototypes

Craig writes:

I’ve gotten a lot of questions on the blog about the new version of the MHS5200A function generators available on eBay. Viewer Tolga was kind enough to send one in to me to review and tear down. Although some improvements have been made over the older models, there are some concerning issues with these new models too!

More details at Analog Zoo homepage.

Datum/Symmetricom 8040 Rubidium frequency standard teardown

via Dangerous Prototypes

pics-8040_int-600

Teardown: A look at the Datum/Symmetricom 8040 Rubidium frequency standard

The 8040 used an LPRO 101 (low profile Rubidium oscillator) oscillator. Interestingly, there is a note written on the top of the LPRO case: “vibration test may have magnetized cover”. As you may know, Rubidium standards’s accuracy is very sensitive to external magnetic field. But it shouldn’t be an issue for me as the drift caused by magnetism is usually in the sub milli-Hertz range and even the most sensitive frequency counter in my lab won’t be able to pick up this minute drift.

More details at Kerry Wong’s blog.

Check out the video after the break.

Keysight MXA revision-b signal analyzer / Spectrum analyzer review, analysis & experiments

via Dangerous Prototypes

Keysight

Keysight MXA revision-b signal analyzer / Spectrum analyzer review, analysis & experiments from The Signal Path:

In this episode Shahriar reviews the long awaited Keysight MXA Signal Analyzer (N9020B). The new X-Series Spectrum Analyzers from Keysight offer an entirely re-designed GUI interface which supports multiple tabs as well as multi-touch interaction.

Check out the video after the break.

 

Teardown and analysis of microwave (26.5GHz) electro-mechanical step attenuators

via Dangerous Prototypes

Teardown and analysis of microwave (26.5GHz) electro-mechanical step attenuators from The Signal Path:

In this short episode Shahriar takes a close look at a pair of Hewlett Packard microwave electro-mechanical step attenuators operating up to 26.5GHz. Mechanical attenuators offer excellent repeatability, low insertion loss and nearly limitless linearity. The teardown reveals that the construction of both modules is very similar on the microwave path. In fact, the lower-frequency model still uses the same attenuator components. The newer model employs electronic control circuity while the older generation attenuator uses purely mechanically controlled DC path. Both models use a solenoid style actuators for step attenuation control.