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# indulis

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488

1. ## thesis

In institutions of higher learning (at least in the States), it would be extremely unusual for an undergraduate degree to require the submittal of a thesis. Now a senior/year end project is a different story, but that not a thesis. From Bertz
2. ## LC filters

Do the math and plot the transfer funtion, then you will know (and should understand) what it does.
3. ## Quick Heaters

If you need/want the mold to cool quickly, you want a material like "ceramic" which has good thermal conductivity, but a low thermal capacity. Basically somethng the conducts heat but won't retain any.
4. ## Program launch: "Get Paid to Publish your Project!"

To Hero999's point, the first project (Temp data logger)... It says: Pin 7 in the schematic is hard wired to +5V... how is that going to work?? Or is it just to early in the morning and I need more coffee?
5. ## Help...problem with test circuit of SG3524..with duty ratio.

Put some minimal load on the output... say 20%.
6. ## Help...problem with test circuit of SG3524..with duty ratio.

These are both buck converters. First, what do you have for a load? You gotta have one, or else it will pulse skip or just shut down once the 500
7. ## More PWM questions

VRM's go even higher... ~100A Not really! http://news.thomasnet.com/fullstory/Voltage-Regulator-Module-is-Intel-VRM-11-0-compliant-818760
8. ## More PWM questions

Look thu some of these... http://focus.ti.com/docs/training/catalog/events/event.jhtml?sku=SEM401001
9. ## Filters

A "filter" with a crystal?? Care to provide an example?
10. ## smps of tv..

Without the transformer (if it
11. ## Evaluating total energy usage from just DC voltage and current

A 50A shunt @ 50mV is only 2.5W dissipated and something like the AD708 has a 30
12. ## Evaluating total energy usage from just DC voltage and current

What kind of current levels are you talking about here? Is there a reason it has to be a DC clamp-on vs. a shunt resistor?
13. ## Element and manufacturer identification?

Yup... it a General Semiconductor (bought by Vishay I think). It could also be a zener or a transient suppressor...
14. ## Inverting Op Amp

The 741 can't swing to GND, you need a negative supply of a few volts.

16. ## Alternator Basics

Like what?? Google is a wonderful search tool... there's lots out there.
17. ## Problems with DC/DC converters in isolated H-Bridge design

That might relate to your problem... more often than not, the regulation (if any) on bipolar supplies is done across both outputs
18. ## Problems with DC/DC converters in isolated H-Bridge design

These are dual supplies... are you using only one side, 15V, or are you running it as a 30V supply? There is a data sheet warning not to exceed 1W
19. ## Problems with DC/DC converters in isolated H-Bridge design

Are you sure about that part #??? NMC series???

21. ## Alternator Basics

KevinIV, what do you think the advantages are over a genarator that has a field winding??? And after you explain that, explain to everyone what role the strength of the flux field has to do with how much power you can get out of a "genarator".
22. ## DC/DC Converter (the proper diode)

Definitely not true. Many factors are considered when selecting diodes in DC-DC
23. ## Alternator Basics

An alternator does not have any magnets in it. Google PM motors, altenators and generators (a DC motor run "backwards")... plenty of info on how they work. The field isn't really "rotating", the commutator changes the flux direction on the rotor pole windings to repel against the field windings flux.
24. ## DC/DC Converter (the proper diode)

That is correct, but that is a minimum... go a bit higher to account for any spikes.
25. ## Sourcing high voltage isolation switch for 150V @ 40A

For those kind of current levels, look into "mercury contactors".
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