Re: International standards (2023 Update)

Ah, now this curve is what I couldn't find on the datasheet.

Thanks!

Jon

Tthat would still leave some rather broad band noise from where the high pass begins up through "daylight," yes? How hard is a simple bandpass, anyway?

But what crosses my mind is that the input picks up 50Hz too easily, perhaps. Using a resistor divider (and an 'HP' capacitor) at the input might help. Something like:

+V | \ / 2M 1uF \ || | ,-----||-------+-+--> first gain stage | || | --- \ | | receiving / 2M --- transducer \ | | gnd gnd

Just a thought.

Jon

It seems that the output ripple is almost as bad as the input ripple, take a look at my simulation results

snipped-for-privacy@btinternet.com/sim1.gif

Either something is wrong, or this circuit goes to the bin.

??

....I mean between gate and drain.

Ah, but what about using the display on a standard VGA output? What does that involve?

including

I

know

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Hello my dear half baked engineers of this thread. I am afraid you were all wrong. I wonder, shall I tell, or shall I let you burn some more midnight oil over this one?

Sure. Try something simple like this first.

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Best Regards,
Mike

IS your light string attached to the source, or the drin?

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Best Regards,
Mike

I heard of an emitter follower, but what is a power follower?

I found this circuit in page 15 of the lm317 manual

Return it for full refund. That would be a good start.

It's probably easiest to grap a jack footprint and save it under a new part name in a library of your own where a reinstall won't wipe it out and then edit it.

Something tells me you're not going to find many EWB users around. I might remember one user who didn't bad mouth EWB, but he's probably commited suicide by now.

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Best Regards,
Mike

The subject says it all. Anybody know? Thanks, Eric

Dunno. I'm spoiled.

You might get away with Orcad (cadence) Layout. You can get a student version and I don't think the limitations will hurt you. I don't recall the Layout limitations.

The overlay you refer to is know as the silkscreen layer. You can also do an outline layer and create custom layers.

Terry Pinnel has a page on CAD programs you should check. If he doesn't chime in soon, I think the URL is something like

and part of that googled ought to return the URL if I'm wrong.

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Best Regards,
Mike

The diode across the inductor will see a peak current almost equal to the current at the moment the mosfet turns off. However, the current falls with something like an L/R time constant, with L being the inductance of the coil and R being its resistance. So the diode does not need to be rated for the continuous current in the coil, though it should have a surge current rating well above the peak current it will pass. A 3 amp rectifier should be fine.

Note that adding this diode will also lengthen the time that current passes through the coil by the same L/R time constant. Is this a problem?

--
John Popelish

I think so.

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John Popelish

35VAC > Bridge rectifier > Lights > Mosfet > Gnd.

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Like a wart is a protuberance on your skin, a wall wart is a
protuberance from a wall.

I'm hoping someone can give a noob some direction here. I've started designing a pcb using electronics workbench and am a bit confused on how to get past where I am.

I'm trying to create a component for a lumberg part (2415_01, 1502_01 and

2410_01) which are upright (vertical) usb, IEEE1394 and 2.5mm jack connectors. When creating a new component it gives me a option of choosing a standard footprint. I can't find a listing of these and I find one that works with this. I also can't see where to create a new footprint.

Any help is GREATLY appreciated :)

Thanks,

A good rule of thumb is to make sure the current rating of the diode exceeds the current going through the inductor when it's on. If you can, choose a diode with a Peak Reverse Voltage (PRV) rating twice the voltage across the inductive load when it's on. I would guess you're using 12 or 10AWG wire (30 amp) to the load. A similar size gauge going to the diode would definitely be helpful, if you can.

I'd be a little more concerned about the turn-off for the FET. It looks like you've got a driver that will turn on the FET quickly, but turn it off slowly with the 10K pulldown. You might want to modify that.

Good luck Chris