How on earth do you manage without one?
I have four on my bench.
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
That might be an application for the fluxgate current probe discussed here a while ago.
The question (still unanswered) about inner layers remains.
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
Why purchase a bench supply ?
Google for LM317.
h
Then google for transformer, enclosure, capacitors, potentiometer, meter, fuse, line cord, heat sink, and machine shop.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Ok, found the problem.
I had to add the power pins to my symbol for the MCU. When adding the pins, got one VDD-VSS pair reversed! As the boss says, Wrong Way Charlie strikes again!
Now I have to see what I can do to fix this on these prototype. Can't waste $1200 to do a re-spin... :-(
Charlie
Blue wire ?:-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
So the Vdd-Vss short is internal to the CPU chip?
You can probably just cut open both bad connections, if it's not a BGA; there are likely other pins that can do the job.
Your boss is being unkind.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Yep! have to lift the pins (Veerrry Carefully...) and then air-wire them to the correct places. Well, I have ten boards to try and get it right on... ;-)
Charlie
Well, she is the boss... ;-)
It is a PIC24FJ256TQFP. I already found a problem with the routing on one ground, don't want to lose another one. I always lift these pins unintentionally when I try to hand solder them. Lets see if I can do it when I want to!
Charlie
Techniques I've used:
If your pcb house messed up, you may have many shorts all over your board. If that's so, the above techniques won't work. I've come across these on rare occasions, one just recently.
If you're a hobbyist, and want to get away from the teevee set, it might make sense to build your own power supply. But for $70 or some such, a metered, finished bench supply doesn't make sense to build.
Ebay has lots of power supplies too...
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
I need benches - so need a supply of (for) them..
You forgot the most essential part..the elbow grease needed to put it all together.
LOL. I think I'll send a summer student to order a jar of that stuff from McMaster...
Did the first board, but it won't program. I think in all that high current testing I probably baked the processor. On to board 2...
Charlie
I've been real impressed with this...
So much so that I threw away a bunch of Heathkits of comparable rating.
But you can still get them via < James Knight >
-- Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com
Never heard of wireless power? :)
Jamie
Yep, AA, AAA, C, D,...
put it
For a few shekels more you can cut the ripple voltage by a factor of
200...-- Cheers, James Arthur
Yikes, a 90 watt metered bench supply for $50. That seems impossible.
-- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.