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 Forum: Computer Programming   Topic: old windows 2K question something weird issue

Posted: Wed Apr 11, 2018 9:18 am 

Replies: 15
Views: 1528

"What angers me, is how certain software companies{MicroSquish} are getting so controlling over there programing languages. Example: If you use C++, and write a program with it. {MicroSquish} has the right to confiscate that program as there own, and you get none of the money you could of earne...

 Forum: General Discussion   Topic: heat sink cooling

 Post subject: Re: heat sink cooling
Posted: Tue Apr 03, 2018 12:33 pm 

Replies: 5
Views: 162

in isolation it doesn't much matter but pulling air out of the HS will tend to deposit more dust in the fins resulting in efficiency loss sooner. when blowing into the HS, the higher velocity will settle less dust. The shape of the cooler may also direct your thinking. If there is an airflow pattern...

 Forum: General Discussion   Topic: Need help with a circuit again

Posted: Thu Mar 29, 2018 11:21 am 

Replies: 9
Views: 273

SSL?, I think he means SSR, Solid State Relay. Lots on Digikey but 12V ones were expensive. The nice part about an opto-isolator is that the switching and load supplies can be completely separate.

 Forum: General Discussion   Topic: dimmer question

 Post subject: Re: dimmer question
Posted: Thu Mar 29, 2018 11:09 am 

Replies: 2
Views: 124

I'm familiar with Dimmable and non Dimmable LED bulbs but these work with conventional lamp dimmers. As far as I know there are only lamp dimmers and motor controllers (fan speed controllers) that can't be interchanged. I suspect the LED compatibility marking on the dimmer package is just marketing ...

 Forum: General Discussion   Topic: HDMI Plug\Connector Issues (RANT)...........

Posted: Mon Mar 05, 2018 1:26 pm 

Replies: 6
Views: 399

interesting, I have not experienced problems with any HDMI connectors yet but in general, the major failure modes would be 1. surface Contamination causing leakage, opens or shift in impedance 2. Spring memory (contacts get compressed and don't spring back causing opens and series resistance faults ...

 Forum: General Discussion   Topic: Overseas PCB fabrication

Posted: Fri Mar 02, 2018 9:22 am 

Replies: 1
Views: 204

more than likely that a PCB you buy from a US company is built in China anyway. Some is still built in US but much is farmed out to shops offshore. For a reseller, its a process of qualifying your suppliers. however for a one off buy you should request samples and price out several shops. If the tec...

 Forum: General Discussion   Topic: i'm looking for some connectors

Posted: Fri Mar 02, 2018 8:59 am 

Replies: 3
Views: 190

100 mil SIP headers and SIP connectors should be easy to find. In most cases you can substitute ribbon cable and plug one of the rows instead of both. there is probably something in your box of spare computer parts (I assume you have one filled with old ribbon cables etc like most PC owners).

 Forum: General Discussion   Topic: Telemecanique Modicon TSX Nano 07 PLC

Posted: Mon Feb 12, 2018 5:49 pm 

Replies: 4
Views: 413

without knowing the details of construction it is hard to say. you said NVR and I thought of a battery backed RAM but it might not be. A photo of the guts would help in that assessment or a list of IC part numbers. What is the vintage? Battery backed RAM would be up to mid 90s I would guess. maybe s...

 Forum: General Discussion   Topic: Telemecanique Modicon TSX Nano 07 PLC

Posted: Mon Feb 12, 2018 4:16 pm 

Replies: 4
Views: 413

an NVR has an internal backup battery but I am unsure if it can be measured external to the package (pin 16 and 20 on some). Its old technology with flash memory and EPROMS mostly replacing it. Is there a coin battery on the module, you would think they would have replaced it when they reloaded thou...

 Forum: General Discussion   Topic: Detecting a magnet... from a distance.

Posted: Sat Feb 03, 2018 9:00 pm 

Replies: 22
Views: 1217

A magnetic wave travels at the speed of light, and not very far when not coupled with an electric field. I don't think any analog circuit would have the response time to measure a differential. With audio the wave travels slower and it still took DSP to make it practical. With DSP the incoming signa...

 Forum: General Discussion   Topic: Detecting a magnet... from a distance.

Posted: Thu Feb 01, 2018 1:08 pm 

Replies: 22
Views: 1217

How slow, too slow and it might as well be stationary as the flux will not couple well into most detectors. a DC magnetic field can be detected with a compass and if smaller than Earth's won't wiggle a needle much. At some point the signal would drop so far into the noise it would become undetectabl...

 Forum: General Discussion   Topic: i need some more Unobtainum...

Posted: Fri Jan 26, 2018 10:47 am 

Replies: 15
Views: 678

LM317 is old school. and with 6V dropped across it, won't be very efficient. there are plenty of small module battery to 3.3V regulators that will well outperform the battery in there now. Search "3V boost regulator" or similar on ebay and you'll find plenty with various specs to choose fr...

 Forum: General Discussion   Topic: i need some more Unobtainum...

Posted: Tue Jan 23, 2018 12:17 pm 

Replies: 15
Views: 678

if your scope is fast enough, you should be able to lock onto the carrier frequency and check the frequency. Demodulating and reading out the digital data is more difficult but if you see modulation on the carrier, you can be relatively sure there is some kind of data. It is unlikely the data is jum...

 Forum: General Discussion   Topic: i need some more Unobtainum...

Posted: Mon Jan 22, 2018 5:50 pm 

Replies: 15
Views: 678

Can I assume that since the chip is an RF receiver, the display lights up but just shows an empty reading all the time? How do you know the transmitter is transmitting or just lighting its power lamp? Check the crystal oscillator and the series ...

 Forum: General Discussion   Topic: Hammond die cast al case, heat sink?

Posted: Fri Jan 19, 2018 8:20 pm 

Replies: 11
Views: 866

if the polished surface still looks like round beads with voids between, I will believe it but the "Die cast" process formally uses molten metal and the molds are often very rough, maybe even sand molds or bead blasted surface. its not very different from plastic molding for a low melt tem...
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