Search found 217 matches

by Garth
Wed Apr 24, 2019 3:04 pm
Forum: Brads Projects University
Topic: Mixed Voltage Systems: Interfacing 5V and 3.3V Devices
Replies: 8
Views: 7645

Re: Mixed Voltage Systems: Interfacing 5V and 3.3V Devices

I see now the link in the head post, http://www.savagecircuits.com/content.php?85-Mixed-Voltage-Systems-Interfacing-5V-and-3-3V-Devices, is dead. I don't remember what was in the original, but one it might have been is http://nutsvolts.texterity.com/nutsvolts/201104/?folio=46&pg=46#pg46, and another...
by Garth
Thu Apr 04, 2019 2:10 pm
Forum: The off topic lounge
Topic: great danger from cell-phone use
Replies: 24
Views: 10238

Re: great danger from cell-phone use

Brussels Becomes First Major City to Halt 5G Due to Health Effects
http://www.greenmedinfo.com/blog/brusse ... th-effects
by Garth
Thu Apr 04, 2019 1:25 pm
Forum: Great video clips
Topic: Vulcan-74: A 6502 Retro MegaProject
Replies: 8
Views: 5485

Re: Vulcan-74: A 6502 Retro MegaProject

Brad, how nice to see you here! There are a few 6502.org members here as well. Two who immediately come to mind are BigEd and Dr Jefyll (Jeff Laughton). I don't know how often they check in. This forum used to be more active, apparently when Brad Slattery (the owner) was having his students post pro...
by Garth
Fri Nov 30, 2018 8:58 am
Forum: PCB Design
Topic: Beginner PCB design for LED clock
Replies: 1
Views: 303

Re: Beginner PCB design for LED clock

A small board like that with 74HC logic will be more forgiving than some. The matter of grounding, ground bounce, bypassing, transmission lines, terminations (which you definitely do not need on this board), etc. is complex and is discussed in a 6502.org topic at http://forum.6502.org/viewtopic.php?...
by Garth
Thu Nov 29, 2018 9:48 am
Forum: The off topic lounge
Topic: Comments on a metronome schematic and board?
Replies: 1
Views: 416

Re: Comments on a metronome schematic and board?

It's pretty clear that you're trying to sell PCBGOGO services here. It's ok though, since at least you're on topic and not giving us unrelated spam like we often have to delete. I was not able to download the dropbox files without starting an account, which I don't really want to do. You can attach ...
by Garth
Tue Oct 02, 2018 4:37 am
Forum: PCB Design
Topic: Circuitmaker
Replies: 8
Views: 4000

Re: Circuitmaker

I just got an email from Digi-Key saying they now had a free online symbol and footprint library for KiCad, at https://www.digikey.com/en/resources/design-tools/design-tools#kicad . On a related note, I just finished my first dense design of parts on both sides. Up until now, I have sometimes put ju...
by Garth
Mon Aug 06, 2018 11:23 am
Forum: The off topic lounge
Topic: great danger from cell-phone use
Replies: 24
Views: 10238

Re: great danger from cell-phone use

Health Concerns from Wi-Fi In Schools FOX 5 News Featuring EHT's Cell Phone Absorption Research (six-minute video): https://www.youtube.com/watch?v=fk17yuFwy7M Wi-fi OFF Switches Installed In Finnish School To Reduce Wireless Radiation Exposure to Children (article): https://ehtrust.org/wi-fi-off-sw...
by Garth
Wed Jul 04, 2018 8:16 am
Forum: PCB Design
Topic: JLCPCB - PCB only $2 :)
Replies: 6
Views: 1690

Re: JLCPCB - PCB only $2 :)

I don't remember if I saw it or not. It seems like I have to have seen it, since I check the forum for new posts every day. I should have recommended putting thermal relief around the pads that go to the plane around them. If you wave-solder it and never need to repair or rework it, it's no problem ...
by Garth
Wed Jul 04, 2018 8:10 am
Forum: The 8x85 RGB LED POV Display
Topic: Is there anyone know SMT parts?
Replies: 6
Views: 3545

Re: Is there anyone know SMT parts?

In the pictures near the top, you'll see an inductor at 22° in the top-right; but I had to make it as a separate component rather than rotate the one I had made earlier. It's very quick and easy to make PCB components in this CAD, except that if it's for SMT, I can't rotate the rectangular pads at a...
by Garth
Sun Jul 01, 2018 12:48 pm
Forum: The 8x85 RGB LED POV Display
Topic: Is there anyone know SMT parts?
Replies: 6
Views: 3545

Re: Is there anyone know SMT parts?

All manual. I still don't use autorouters. When you want it super compact, you have to route things while you place the parts, because every mil counts. If you try to sprinkle the parts in and then route the connections, you won't be able to. I'm always moving a part a mil or two this way or that to...
by Garth
Wed Jun 06, 2018 4:40 pm
Forum: Your projects
Topic: super-simple file system for flash memory
Replies: 6
Views: 5664

Re: super-simple file system for flash memory

This 12-minute video is relevant. It's not a "super-simple file system" (like this forum topic title calls for), but it does describe folders and fragmentation rather simply. https://www.youtube.com/watch?v=KN8YgJnShPM&t=0s&list=PL8dPuuaLjXtNlUrzyH5r6jN9ulIgZBpdo&index=22 This is in a sequence of vi...
by Garth
Mon Jun 04, 2018 5:13 pm
Forum: The 8x85 RGB LED POV Display
Topic: Is there anyone know SMT parts?
Replies: 6
Views: 3545

Re: Is there anyone know SMT parts?

I think you will have to be more specific. I have designed many SMT boards, but I don't know what kind of information you are looking for. Some of the ways I can think of where SMT layout differs from thru-hole are: In thru-hole, every pin goes to every layer. This is both and advantage and a disadv...
by Garth
Thu May 03, 2018 3:05 pm
Forum: Online Shopping
Topic: Kid's books in Electronics and Coding
Replies: 3
Views: 1613

Re: Kid's books in Electronics and Coding

I had forgotten about this topic. I finished the K&R C book, 2nd Ed., and read part of another, and wrote on my website about my adventures of trying to learn C, at http://wilsonminesco.com/stacks/Cbeef.html .
by Garth
Mon Feb 12, 2018 7:43 pm
Forum: PCB Design
Topic: Circuitmaker
Replies: 8
Views: 4000

Re: Circuitmaker

brad wrote:
Sat Oct 08, 2016 6:57 am
I've actually been looking at moving over from diptrace to kicad:

http://kicad-pcb.org/

It's free and open source for windows, linux and mac
Brad, a friend of mine just asked tonight about KiCad so I wonder if you can give a review. I don't think he has ever used any CAD before.
by Garth
Tue Feb 06, 2018 4:21 pm
Forum: The off topic lounge
Topic: great danger from cell-phone use
Replies: 24
Views: 10238

Re: great danger from cell-phone use

video documentary about people who get immediate pain, inability to sleep, and other problems when exposed to WiFi, cell-phone signals, Bluetooth, Zigbee, etc., and what they have to do to get relief: "WiFi refugees Nowhere to Run: Electrosensitive People Try To Escape Wireless Technology" https://r...