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I don't know why one would look to a snubber to protect a switch. Snubbers, RC, RLC, are typically employed to control dv/dt on semiconductors. I don't consider a capacitor alone as a snubber. It is

"the PTC is in parallel with the resistor, not in series" Just to confirm that it is definitely an NTC, not a PTC, in the 2465 "EMF is a high voltage phenomenon, not a high current phenomenon. The

Would a metal oxide varistor be more suitable?

On Mon, 30 Jul 2018 15:52:29 -0400, you wrote: The supply has to deal with (effectively) a ramp up of the input voltage rather than an abrupt step. May confuse some chips that need a minimum dv/dt,

On Mon, 30 Jul 2018 11:50:21 -0700, you wrote: >I have now seen two 2465 PCB blocks with a burnt-out on/off switch. > >The damage is caused by the arcing across the now-separating terminals, when the

Several people have mentioned their interest in schematics, others have offered to try and make image files or PDF's. Being the original poster, I'll collect scans/images and if the package is more or

John, Yes, please have a look if you have PDF schematics, that would make life a lot easier. Raymond

You could take the schematics to almost any Office Depot and copy them full size to a ThumbDrive. Then post them in the files area. 73, Dick, W1KSZ wrote:

Everyone - thank you very much for the pointers! I will attempt as described - a "spit and shine" cleaning, then checking rail voltages and ripple, then following the H?kan's article (special

How about our hero Hakan! He comes through with the best information on the planet, time after time! Also, a big 'Thank You' to everyone who contributes to all of the fine discussions that come across

I received an answer from SRS. They only supply schematics with paper manuals @ USD 110,-.... Raymond

OK, John, thanks. Raymond

I'm not at the computer that has the PDF's right now so I can't check. I know for certain I have the schematics in the printed manual but they're 11" x 17" which is too large for my scanner. I should

The L we are interested in is the inductance that the power supply presents to the power line. In the case of the 2465, that is very low, in the tens to hundreds of micro Henries. Insignificant, in so

Thanks a lot for that document Hakan, priceless.... Vincent Trouilliez

These scopes were made to operate over a wide temperature range. A thermistor's cold resistance can become very high at the low end of the temperature range, perhaps high enough to make it unlikely to

It's a known problem and I think it has been discussed here before. There were a few WW articles written on the subject. You can find them here:

Hi Steve: I can help you with your knob problem.? First, remove it and clean out any plastic residue from the skirt on the knob.? Then carefully apply a small stream of super glue around the inside

Thanks Chuck Help me here: You wrote: it would be chosen to have a capacitive reactance equal in ABSOLUTE VALUE to the inductive reactance of the load it switches. 1. Using the formula (with 230VAC,

Hi Chuck, Where does a shunt resistor go relative to the thermistor? I thought the thermistor was the only component in an inrush current limiter. Is that incorrect? Thanks, Barry - N4BUQ <snip>