Search found 250 matches

by ian
Mon Apr 07, 2014 11:14 am
Forum: General Discussion
Topic: Inductors in parallel - Brilliant or wacky?
Replies: 4
Views: 1252

Re: Inductors in parallel - Brilliant or wacky?

I guess the effect could be measurable in controlled conditions. If it were a fixed frequency switcher what would change if the inductance was larger or smaller? (Given the same load and input/output voltage). I do not believe it is an air core inductor as the spec sheet says "High saturation core m...
by ian
Tue Apr 01, 2014 6:01 pm
Forum: General Discussion
Topic: Inductors in parallel - Brilliant or wacky?
Replies: 4
Views: 1252

Inductors in parallel - Brilliant or wacky?

Hey guys. I'm making a pc board for a switching power supply rated at 2 - 3 Amps. The switcher requires an inductor of 100 - 200uH. I might make a lot of these as I am trying to design a cool product for hackers like us. Here's the thing......... I bought a big bunch of surplus inductors rated 330uH...
by ian
Tue Aug 28, 2012 7:20 pm
Forum: General Discussion
Topic: SDCC compiler problems
Replies: 1
Views: 629

SDCC compiler problems

Guys, I am trying to run some C programs from the Silicon Labs website. I'm using the Silicon Labs IDE and the SDCC compiler. I'm fairly new to this but it seems nothing short of ridiculas. I can't find ANY documentation on the SDCC compiler. The users manual doesn't describe any syntax, error codes...
by ian
Fri Mar 16, 2012 10:19 am
Forum: General Discussion
Topic: Looking for H Bridge driver
Replies: 1
Views: 874

Looking for H Bridge driver

I'm looking for a good half or full bridge driver preferably available at digikey. "Good", as in, infinite current, impervious to overloads, small footprint, and costs about 5 cents. It should also do laundry when I'm out. But barring that......... Electronically simple, just on/off. Short circuit a...
by ian
Tue Feb 22, 2011 1:56 pm
Forum: General Discussion
Topic: Electrostatic problems
Replies: 6
Views: 1638

Re: Electrostatic problems

I figured it out. I thought it was the flux. But I cleaned the boards so it wasn't. HEY. who says I can't slide the electronics around a staticy/staticky/sticky carpet??? Can't I have ANY fun? Doesn't the grounded metal box count for SOMETHING? I was using the wrong program. This in itself wasn't th...
by ian
Wed Jan 26, 2011 9:32 am
Forum: General Discussion
Topic: Electrostatic problems
Replies: 6
Views: 1638

Electrostatic problems

Hello smart guys......... got a question for you. Good for the board too. I make small electronic gadgets for local manufacturers and I've been making this PIC based gadget for a few years now. It's a small PIC micro on a 4" X 4" board powered by a 24VAC transformer. Everything is housed in a ground...
by ian
Wed Mar 24, 2010 4:29 pm
Forum: General Discussion
Topic: The bloom of the Bloom fuel-electric cell...
Replies: 10
Views: 2013

Re: The bloom of the Bloom fuel-electric cell...

Why is it I can't buy one of these cells?
Miles and miles of spin and hype but you can't buy one for independent testing.
Guess you'll just have to take their word for it.
by ian
Wed Mar 24, 2010 3:36 pm
Forum: General Discussion
Topic: The Origin of Life (Electrical)
Replies: 35
Views: 5703

Re: The Origin of Life (Electrical)

A few (logical) words about knowing, and not knowing. It stands to reason that if there is no God, and no intelligent design, man cannot "KNOW" anything at all. Anything our minds knew would be susceptable to the fickle forces of blind, programmed, evolution, and therefore, suspect. How would we kno...
by ian
Fri Oct 16, 2009 2:03 pm
Forum: General Discussion
Topic: Oh no,not another LED lighting question...........
Replies: 6
Views: 1126

Oh no,not another LED lighting question...........

Got a BIG BIG sign, translucent red, lit from behind by fluorescent lamps. Maybe 20 10' letters in it. Now I'm thinking, due to thier characteristics in this application, Leds could really outdo even efficient fluorescents. Consider that fluorescents light 360 degrees, so a lot of light is lost towa...
by ian
Tue Oct 13, 2009 3:14 pm
Forum: General Discussion
Topic: Solder from Hell
Replies: 4
Views: 846

Solder from Hell

I'm assembling a multitude of PIC driven boards for a product. I get some help from various people to do the soldering. So one of my guys suddenly starts delivering blobbed solder, burnt traces, crappy boards. I threaten to cut him off so he tries harder but keeps delivering crappy boards. I bring h...
by ian
Sat Jul 25, 2009 9:08 am
Forum: General Discussion
Topic: switching power supply VDE compliance
Replies: 4
Views: 886

Re: switching power supply VDE compliance

Yeah, that's what I'm afrid of. "Check with the FCC"????
How easy and how well do you think that conversation might go?
by ian
Fri Jul 24, 2009 6:56 pm
Forum: General Discussion
Topic: switching power supply VDE compliance
Replies: 4
Views: 886

switching power supply VDE compliance

Whoo wa! Talk about a can of worms and hardly any info on the net! I've made a device that uses a UL approved adaptor. So the INPUT of the device complies with UL. But what if I use the OUTPUT of the adaptor to power a switching DC to DC converter and sell it at a retail level????? Are there EMI or ...
by ian
Wed May 14, 2008 10:26 pm
Forum: General Discussion
Topic: Explain this transformer phenomenon..............
Replies: 10
Views: 2596

I did have two circuits doing the same thing when I was scoping the
waveforms.

I also do not understand this "leakage". I put 40V across the the
diode and measured the leakage. I tested 20 and only a few
leaked anything measurable, like a few microamps.
by ian
Wed May 14, 2008 8:27 am
Forum: General Discussion
Topic: Explain this transformer phenomenon..............
Replies: 10
Views: 2596

The odd thing about this circuit is that the bottom part of the
rectified waveform is distinctly "clipped". It is a nice sine wave
until about 4V then it is suddenly flat. I don't know what would
cause that.
by ian
Wed May 14, 2008 8:11 am
Forum: General Discussion
Topic: Explain this transformer phenomenon..............
Replies: 10
Views: 2596

I applied 20V to the diode I'm using but there was no apparent leakage through the SB560. I did reduce the 30k resistor to 15K and the +voltage drops to 0 but the input to the transistor base became "fuzzy" and did not drop enough to put the transistor into conduction. Strange. I have now put the 30...