Search found 2678 matches

by haklesup
Tue Oct 23, 2018 5:09 pm
Forum: General Discussion
Topic: Lithium Ion charger hack..
Replies: 1
Views: 30

Re: Lithium Ion charger hack..

following the link from the schematic page to the part you do get a reference schematic with the NTC included but you need more than that device, you will need the voltage divider it forms with R1 and R2. the web page says "Thermal feedback regulates the charge current " So I presume the voltage on ...
by haklesup
Mon Oct 22, 2018 5:37 pm
Forum: General Discussion
Topic: Amplifier LM358—classical circuits
Replies: 3
Views: 59

Re: Amplifier LM358—classical circuits

not surprising, some of those circuits are very incomplete. If you are interested, continue studying op amps in general, there will be many many references. Once you understand the basics of applying them as Amplifiers, filters, current sources, comparitors etc then you can start looking at the spec...
by haklesup
Fri Oct 19, 2018 12:00 pm
Forum: General Discussion
Topic: USB-C, 100 watts?
Replies: 2
Views: 106

Re: USB-C, 100 watts?

What I found seems to be mainly press releases some a few years ago This was the most recent citation I could find https://www.pcmag.com/article2/0,2817,2478121,00.asp I'm still looking for an actual technical spec for a cable or connector that says this capability was ever implemented or what it mi...
by haklesup
Fri Oct 12, 2018 4:40 pm
Forum: General Discussion
Topic: How to tell it is good?
Replies: 8
Views: 232

Re: How to tell it is good?

A variable regulator like LM317 will work but it will be inefficient when you run it at low voltage and higher current, that's when you maximize the voltage drop across the device and maximize and so is the power, this is when it will become hottest. The regulator is best used for known loads if bat...
by haklesup
Fri Oct 12, 2018 1:24 pm
Forum: General Discussion
Topic: Spy camera-wireless signal boosting.
Replies: 12
Views: 1411

Re: Spy camera-wireless signal boosting.

If the spot is secure then an IP camera connected to a willing neighbor's Wi-Fi would be simplest and most reliable. If no wi-fi, get a cheap phone and tether to the camera. If not secure, put it all in your car and run it off the battery and park in a strategic spot. A Dash cam might suffice for th...
by haklesup
Tue Aug 28, 2018 12:47 pm
Forum: General Discussion
Topic: i need a long QR type code identified
Replies: 16
Views: 629

Re: i need a long QR type code identified

It likely translates into the same test just above it possibly linking back to an account holder that paid for the postage but I wouldn't expect them to tell you who it is without a warrant.
by haklesup
Mon Aug 27, 2018 11:38 am
Forum: General Discussion
Topic: HDMI Plug\Connector Issues (RANT)...........
Replies: 10
Views: 2154

Re: HDMI Plug\Connector Issues (RANT)...........

sounds like a cold solder joint and working the connector remakes a cold weld for a little while. That's usually what I find when there is finger tip sensitivity to open circuits at a cable connector (where replacing the cable does not seem to help). try a reflow with hot air, water clean flux would...
by haklesup
Tue Aug 21, 2018 3:39 pm
Forum: General Discussion
Topic: Needing ESP8266 help for a wifi clock build.
Replies: 5
Views: 390

Re: Needing ESP8266 help for a wifi clock build.

Looking for info online, I can see modules are either configured in a larger DIP with 30 pins and a smaller board with 8 pin header likely strictly serial. Can I assume you are using the lower pin count version and are planning to interface to a decoder directly using serial methods. I think the hoo...
by haklesup
Mon Aug 20, 2018 1:17 pm
Forum: General Discussion
Topic: TV lacking remote control...
Replies: 5
Views: 353

Re: TV lacking remote control...

"Well, thinking of buying my next TV, plugged back... and it works fine. Now no justification for a new TV :sad: .
Anyway, somehow, Murphy strikes again."

Shoulda started with the reboot, but maybe you want a new TV anyway, the 4K smart ones are reasonably priced now.
by haklesup
Thu Aug 16, 2018 12:03 pm
Forum: General Discussion
Topic: i need a long QR type code identified
Replies: 16
Views: 629

Re: i need a long QR type code identified

I was also able to read a string of nonsense characters probably translated from a binary string but it was all garbage. I couldn't say if that string was correct or scrambled but it was clear one needed the right app with access to the right database. I used the first QR reader app I found in the a...
by haklesup
Tue Aug 14, 2018 11:32 am
Forum: General Discussion
Topic: i need a long QR type code identified
Replies: 16
Views: 629

Re: i need a long QR type code identified

Likely because it is proprietary and contains payment information (the value of the postage) they probably don't want anyone tampering or learning how to make free stamps. If that is the case, no public app will have access to the database the code points to.
by haklesup
Thu Aug 09, 2018 12:03 pm
Forum: General Discussion
Topic: Beheaded fatty nail as soldering tip...
Replies: 21
Views: 1174

Re: Beheaded fatty nail as soldering tip...

(from wiki) Above1700 °C (1973 K /3583 °F) in vacuum or oxygen-free atmosphere, diamond converts to graphite; in air, transformation starts at ~700 °C. Diamond's ignition point is 720–800 °C in oxygen and 850–1000 °C in air I think of those folks rummaging through ash in the CA wildfires and finding...
by haklesup
Tue Aug 07, 2018 3:58 pm
Forum: General Discussion
Topic: Beheaded fatty nail as soldering tip...
Replies: 21
Views: 1174

Re: Beheaded fatty nail as soldering tip...

"Reminds me of when cutting steel with a diamond impregnated circular saw blade. The diamond tends to dissolve" Probably due to overheating or advancing too fast. When using diamond to cut anything the key is slow and cool. While a diamond is very hard, they can be burned at a lower temp than the me...
by haklesup
Fri Aug 03, 2018 11:29 am
Forum: General Discussion
Topic: wireless door button - several failed.
Replies: 17
Views: 947

Re: wireless door button - several failed.

in almost all cases this is a bare die epoxied to the PCB then gold bond wires ultrasonically welded to the die and PCB pad then covered with a "Glob" of epoxy. Its pretty close to a packaged device technology but is even lower cost for high volume products. For more most chips, they almost always c...
by haklesup
Wed Aug 01, 2018 1:13 pm
Forum: General Discussion
Topic: wireless door button - several failed.
Replies: 17
Views: 947

Re: wireless door button - several failed.

I hear the complaints about buttons. For new projects with uControllers, there is lots of support for capacitive touch keypads, sliders and other button configurations on ebay and other places to get modules. No need to use mechanical buttons if you are determined. Unlikly any would eb compatible to...