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how to test for flaky solder connections?
ron_sutherland wrote: Brian Fairchild wrote: Surely testing is a backstop     Backstop? Interesting... If I were hoping to ditch testing, I would start by getting rid...
Monday, 18 January 2021 - 06:35
how to test for flaky solder connections?
DocJC wrote: Make sure that the parts are “clean”.  Old parts with an oxide layer won’t solder well.     I have a lot of parts left over from a very salty air...
Monday, 18 January 2021 - 03:53
Bypass caps 'Hands on demo' help ...
Speaking of childish: DocJC wrote: If I ever jump out of an airplane you can bet I'm going to be wearing a parachute. I HAVE jumped out of an airplane without a parachute. ...
Monday, 18 January 2021 - 02:41
How to find out chip family if the chip label is removed
Presuming they haven't blown the RSTDISABL fuse.  If they're going to the effort to sand off chip ID silkscreens, I'd wonder if they did that too.  S.
Saturday, 16 January 2021 - 12:03
How to find out chip family if the chip label is removed
Okay.  Now you get to go onto microchip's web site (try https://www.microchip.com/maps/m...) and find which AVRs have the same number of pins in the same form factor and work...
Saturday, 16 January 2021 - 09:14
Using battery and no switch
There exist LEDs that drop in the 2V range, but none of my 7-segment displays drop anything like that.  A typical red LED drops ~0.6/0.7, in my experience.    And 1...
Saturday, 16 January 2021 - 09:06
How to find out chip family if the chip label is removed
Alternately, if it's an AVR, and on a board with an ISP connector, you can just plug in your programmer and ask it nicely, and it'll tell you what it is.  S.
Saturday, 16 January 2021 - 05:19
How to find out chip family if the chip label is removed
For a bare chip, I'd say it's practically impossible.  Oh, it's not certainly impossible:   Sure, if you wanted to tear the top off (decapsulate), which may or may not...
Saturday, 16 January 2021 - 05:10
Using battery and no switch
A typical Xtal, properly biased (that's what the little caps are for) should be just fine for one part in 10,000 (one millisecond in ten seconds).    I agree with DocJC...
Saturday, 16 January 2021 - 01:35
Missing third byte with buffered interrupt driven UART, but NOT when debugging
Welp, if you've confirmed that TXC is not firing when it shouldn't, then that's ruled out.  Must be something else then...   I would like to make a minor editorial...
Saturday, 16 January 2021 - 01:25
Missing third byte with buffered interrupt driven UART, but NOT when debugging
jtw_11 wrote: Just the third byte, so I get 1,2,4,5,6,7,8,n...   Scroungre wrote:   And just off the top of my head, I'd suggest putting TXc where you've got UDRe - don'...
Friday, 15 January 2021 - 11:07
Missing third byte with buffered interrupt driven UART, but NOT when debugging
Yah, in a way.  TXC should be disabled while you're using UDRE to keep loading more data to send - otherwise it'll fire, and turn off your UART.  S.
Friday, 15 January 2021 - 11:03

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