Search found 2972 matches
- Mon Nov 08, 2021 2:16 pm
- Forum: General Discussion
- Topic: 74hc595 noise problem ?
- Replies: 2
- Views: 2265
Re: 74hc595 noise problem ?
HC logic is pretty easy to work with, it has wide input and output logic levels and if you are using all the same kind, its probably not a logic level issue anyway. You should always place decoupling capacitors close to the VDD and GND pins of each logic device (small ceramic values) and a larger ca...
- Thu Oct 21, 2021 12:40 pm
- Forum: General Discussion
- Topic: LM358 differential voltage and amplifier circuit
- Replies: 5
- Views: 3226
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.
Start on the left and compare each node to your model until you find the disagreement and debug from there.
- Tue Oct 19, 2021 12:50 pm
- Forum: General Discussion
- Topic: How to adjust the backlight of LCD?
- Replies: 2
- Views: 8941
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...
- Tue Oct 19, 2021 12:42 pm
- Forum: General Discussion
- Topic: Starter Relay Trouble
- Replies: 6
- Views: 5116
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 ...
- Tue Oct 12, 2021 11:12 am
- Forum: General Discussion
- Topic: Probes?
- Replies: 7
- Views: 7012
Re: Probes?
Great opportunity for 3D printed case. Bigger learning curve and probably still more than $40 though
- Fri Sep 24, 2021 11:41 am
- Forum: General Discussion
- Topic: Probes?
- Replies: 7
- Views: 7012
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 coul...
- Tue Sep 21, 2021 4:14 pm
- Forum: Reader Projects
- Topic: LCD and Gyroscope
- Replies: 7
- Views: 104175
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...
- Tue Sep 21, 2021 11:34 am
- Forum: General Discussion
- Topic: MCP2551 Circuit Problem in automotive
- Replies: 3
- Views: 3834
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...
- Thu Sep 16, 2021 5:12 pm
- Forum: General Discussion
- Topic: Translated signals (multiple level) with LS7366R
- Replies: 1
- Views: 2858
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...
- Wed Sep 08, 2021 2:01 pm
- Forum: General Discussion
- Topic: Amplifier Comparator LM311P Using Problem
- Replies: 3
- Views: 3064
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...
- Tue Aug 31, 2021 2:14 pm
- Forum: Reader Projects
- Topic: LCD and Gyroscope
- Replies: 7
- Views: 104175
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...
- Thu Aug 26, 2021 2:11 pm
- Forum: General Discussion
- Topic: Where is all my talks with Alan about the BME280?
- Replies: 3
- Views: 8743
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
- Tue Aug 24, 2021 11:01 am
- Forum: General Discussion
- Topic: Do i need to buy a ballast resistor ?
- Replies: 6
- Views: 3549
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...
- Fri Jul 30, 2021 10:59 am
- Forum: General Discussion
- Topic: Compatible NAND Memory Problem
- Replies: 6
- Views: 9036
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...
- Thu Jul 29, 2021 10:56 am
- Forum: General Discussion
- Topic: Compatible NAND Memory Problem
- Replies: 6
- Views: 9036
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 ...