Search found 2488 matches

by mawyatt
Tue May 12, 2020 8:10 am
Forum: General Discussion Forum and Community Announcements
Topic: Visible emission from transistor PN junction
Replies: 2
Views: 868

Visible emission from transistor PN junction

Here's an interesting post on the visible photon emission from a reversed biased breakdown transistor emitter base junction.

https://www.eevblog.com/forum/projects/ ... msg3063526

Best,
by mawyatt
Tue May 12, 2020 6:28 am
Forum: Equipment Discussions
Topic: Controlling Motorized rigs - Arduino or Raspberry Pi?
Replies: 11
Views: 2428

I started with Mike's custom Trinamic 5072 boards as shown in my pic above, and then built a few of my own custom boards to accomodate a more powerful Trinamic 5160 and a single 5072 on a second rig. start http://www.photomacrography.net/forum/userpix/5301_Trinamic_Homemade_smalljpg_1.jpg Mike has ...
by mawyatt
Tue May 12, 2020 5:58 am
Forum: Equipment Discussions
Topic: Controlling Motorized rigs - Arduino or Raspberry Pi?
Replies: 11
Views: 2428

Hope everyone is doing well and thanks for all the great responses. I came to the conclusion Raspberry Pi and these Trinamic controllers sound like a pretty compelling potential answer for me. I picked up some TMC5072-BOB boards & adafruit perma proto pi hats to have on hand. Mike I am not quite un...
by mawyatt
Fri May 08, 2020 4:57 am
Forum: Equipment Discussions
Topic: Hensel to Broncolor wire
Replies: 10
Views: 1330

Agree with Macro_Cosmos and chris_ma. These flash units, even the small battery powered units that mount on the camera hot shoe, have lethal voltages present and the capacitors can hold this voltage for quite some time, long after things are turned off and disconnected. As mentioned, have someone th...
by mawyatt
Wed May 06, 2020 5:06 pm
Forum: Equipment Discussions
Topic: Thermal Printer
Replies: 18
Views: 1866

Saul,

Wonder if the "new boards" come with the Trinamic chips, these could explain the quietness since they have the Stealth Chop Mode.

Best,
by mawyatt
Wed May 06, 2020 7:10 am
Forum: Equipment Exchange
Topic: WTB in USA M26-36tpi to 52mm
Replies: 14
Views: 1973

I can 2nd Chris and Macro_Cosmos. I've had so many problems with cheap eBay rings and adapters from China, they are either labeled wrong & don't fit, bind, or are so loose not useful (lost is shipment (claimed?), long delivery, etc). Unless you know the vendor, it's "rolling the dice" for any cheap ...
by mawyatt
Wed May 06, 2020 6:40 am
Forum: Equipment Discussions
Topic: Using cheap XYZ stages for subject mounting?
Replies: 6
Views: 1392

To be clear on the Wemacro XYR stages, these are not manufactured by or for Wemacro. Similar or maybe the same devices are available from eBay, but I've found eBay to be risky on many things unless you know the supplier. William at Wemacro seems to carefully watch the quality of all the items they s...
by mawyatt
Tue May 05, 2020 7:16 pm
Forum: Equipment Discussions
Topic: Thermal Printer
Replies: 18
Views: 1866

Thanks folks. Don't mind tinkering and somewhat patient, so may be a good candidate but will wait for the prices to drop. I was considering using a small heat sink for the LED and using the printed plastic part to mount to the heatsink, so the plastic will only see the lower heat sink temperature. B...
by mawyatt
Tue May 05, 2020 12:54 pm
Forum: Equipment Discussions
Topic: Thermal Printer
Replies: 18
Views: 1866

Yes, 3D thermal printer.
by mawyatt
Tue May 05, 2020 7:31 am
Forum: Equipment Discussions
Topic: Thermal Printer
Replies: 18
Views: 1866

Thermal Printer

Considering a thermal printer after seeing all the great works folks have produced. Have a few small printed circuit boards (usually under 100mm square, 60mm height or less) and such that been developed that I would like to create cases for and maybe some future small fixtures to support LEDs lights...
by mawyatt
Tue May 05, 2020 7:05 am
Forum: Equipment Discussions
Topic: Using cheap XYZ stages for subject mounting?
Replies: 6
Views: 1392

I have and use the XYR stages from Wemacro, they work well and aren't expensive. These are 40mm square types and thus don't support heavy loads.

https://www.wemacro.com/?product=xyr-st ... men-holder

Best,
by mawyatt
Sun May 03, 2020 9:05 am
Forum: Equipment Discussions
Topic: DVM & Scope Calibrator
Replies: 4
Views: 1402

I had ordered a LM399 reference off eBay about 4 month ago, thought is was never shipped, but finally it arrived. Decided to build up a quick test circuit with some parts I had on-hand to check it out. It's pretty stable!! The 2 DVMs (they need calibration which I'm delinquent on getting done) are A...
by mawyatt
Sun May 03, 2020 5:42 am
Forum: Administrator's Appreciation Gallery...Macro and Close-up Images
Topic: Spiked
Replies: 18
Views: 7027

Steve,

Congrats, nice clever creative image!!

Love the needle development story, never even considered how these were made and yet used them every day when doing chip probing.

Best,
by mawyatt
Sun May 03, 2020 5:34 am
Forum: Equipment Discussions
Topic: Camera upgrade
Replies: 33
Views: 5258

Charles, Congrats!! James, I have the Nikons and must stay with them for same reason Charles mentioned (glass investment). They will block the flash hot shoe in Fully Electronic mode, and do use the rear curtain to terminate the exposure in EFSC mode. A work around has been developed for the hot sho...
by mawyatt
Fri May 01, 2020 8:14 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: DIY microscope: Lego, 3D printing, Arduinos, Raspberry Pi
Replies: 4
Views: 2257

Re: DIY microscope: Lego, 3D printing, Arduinos, Raspberry P

Brought to my attention this morning by IEEE Spectrum: https://spectrum.ieee.org/geek-life/hands-on/build-a-sophisticated-microscope-using-lego-3d-printing-arduinos-and-a-raspberry-pi Quoting from the start of the article: Build A Sophisticated Microscope Using Lego, 3D Printing, Arduinos, and a Ra...