Search found 2926 matches

by haklesup
Thu Oct 21, 2021 12:40 pm
Forum: General Discussion
Topic: LM358 differential voltage and amplifier circuit
Replies: 5
Views: 99

Re: LM358 differential voltage and amplifier circuit

easiest way to see if Dyarker is on to something regarding tolerance is to measure each resistor you used and update your model with actual values.


Start on the left and compare each node to your model until you find the disagreement and debug from there.
by haklesup
Tue Oct 19, 2021 12:50 pm
Forum: General Discussion
Topic: How to adjust the backlight of LCD?
Replies: 2
Views: 171

Re: How to adjust the backlight of LCD?

Is it lower than when it was new? Are you hunting a failure or do you just want it to be brighter. If it has n OSD, that means it is a digitally controlled DC to DC converter somewhere and without a schematic, modifying it may not be practical. If there is a failure making it too dim, then maybe you...
by haklesup
Tue Oct 19, 2021 12:42 pm
Forum: General Discussion
Topic: Starter Relay Trouble
Replies: 4
Views: 152

Re: Starter Relay Trouble

sounds like you induced an open circuit somewhere in the wiring harness during the assembly process. You'll need to trace the 12V from source through switches to loads to see where it can't get through. Are there any fusible links, they act like fuses but aren't always obvious. Check ground as well ...
by haklesup
Tue Oct 12, 2021 11:12 am
Forum: General Discussion
Topic: Probes?
Replies: 7
Views: 772

Re: Probes?

Great opportunity for 3D printed case. Bigger learning curve and probably still more than $40 though
by haklesup
Fri Sep 24, 2021 11:41 am
Forum: General Discussion
Topic: Probes?
Replies: 7
Views: 772

Re: Probes?

Do you mean like the pencil style enclosure, The exact enclosure style you are picturing in your head may indeed be unobtainable but if you broaden your search to the larger offshore enclosure manufacturers, you might find something useful. The "Style-case" line from OKW seems like it could be used ...
by haklesup
Tue Sep 21, 2021 4:14 pm
Forum: Reader Projects
Topic: LCD and Gyroscope
Replies: 5
Views: 5672

Re: LCD and Gyroscope

Do you mean like AR or VR type apps? Move the screen around and view the 3D model? Interesting but synching graphics to the accelerometer output is way over my head. r-Pi with good graphics on board already seems like the best platform to start with. Sounds like you need more than just a uController...
by haklesup
Tue Sep 21, 2021 11:34 am
Forum: General Discussion
Topic: MCP2551 Circuit Problem in automotive
Replies: 3
Views: 465

Re: MCP2551 Circuit Problem in automotive

Need more clues about how the module failed that caused you to replace it. An easy check is to use the diode check or resistance range on a DMM and check each pin with respect to the ground and/or VDD pins to look for shorts or opens that are not on the good unit. If you find that, it indicates an E...
by haklesup
Thu Sep 16, 2021 5:12 pm
Forum: General Discussion
Topic: Translated signals (multiple level) with LS7366R
Replies: 1
Views: 580

Re: Translated signals (multiple level) with LS7366R

I haven't dug into the meat of your specific application but the crux of level shifting comes from analysis of the DC specifications part of the datasheet. In particular, you need to verify that the output logic levels from the first stage are compatible with the input logic levels of the second sta...
by haklesup
Wed Sep 08, 2021 2:01 pm
Forum: General Discussion
Topic: Amplifier Comparator LM311P Using Problem
Replies: 3
Views: 554

Re: Amplifier Comparator LM311P Using Problem

I suppose you are looking at the current path R6 thru D1 thru pin 7 to pin 1 of U2 to ground. Since this is used as a comparator, we can assume it is either fully on or off and not in any active region Since the CE configuration acts more like a switch it kind of acts like an Inverter. When the tran...
by haklesup
Tue Aug 31, 2021 2:14 pm
Forum: Reader Projects
Topic: LCD and Gyroscope
Replies: 5
Views: 5672

Re: LCD and Gyroscope

The MPU6050 chip and similar chips are available on a module with interface PCB for Arduino from Adafruit and sparkfun from various sellers so I would say integrating accelerometers like this one with most uControllers should be possible, especially if you can find a code library and use it out of t...
by haklesup
Thu Aug 26, 2021 2:11 pm
Forum: General Discussion
Topic: Where is all my talks with Alan about the BME280?
Replies: 3
Views: 559

Re: Where is all my talks with Alan about the BME280?

search engine on "BME280 forum" finds several different forums with active or recent discussions
by haklesup
Tue Aug 24, 2021 11:01 am
Forum: General Discussion
Topic: Do i need to buy a ballast resistor ?
Replies: 6
Views: 708

Re: Do i need to buy a ballast resistor ?

I've only had to add load resistors to the turn signals because the flasher relay requires a minimum current to run. That resulted in variable flash rates under different load situations so I found a solid state flasher relay and replaced that in my fuse box and now it works with or without the ball...
by haklesup
Fri Jul 30, 2021 10:59 am
Forum: General Discussion
Topic: Compatible NAND Memory Problem
Replies: 6
Views: 4875

Re: Compatible NAND Memory Problem

Hi Bob, I saw your email, not sure how to reply back that way. I don't write firmware, My perspective is more from a general device testing perspective but that gets me looking at a wide range of datasheets along the way and experience with DC characterization on these parts. Are you using the TSSOP...
by haklesup
Thu Jul 29, 2021 10:56 am
Forum: General Discussion
Topic: Compatible NAND Memory Problem
Replies: 6
Views: 4875

Re: Compatible NAND Memory Problem

If you can attach to it with your programmer then you are probably addressing the device properly. I suppose if the programmer expects a certain size and if its not, it might report that as bad blocks but I'd think modern programmers are smarter than that. I'm not sure what the AAT suffix means but ...
by haklesup
Thu Jul 29, 2021 10:39 am
Forum: General Discussion
Topic: DIY pancake slip ring
Replies: 16
Views: 6737

Re: DIY pancake slip ring

Heat treating while a science, you need to know your starting material and have control over the process to make it predictable. https://materion.com/-/media/files/alloy/tech-briefs/at0015-0311---tech-briefs---heat-treating-copper-beryllium-parts.pdf According to this I would guess you are starting ...