Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

"Death Cap Question"
#1

Hi,
I have been searching the various sections on the Phorum but have not found the answer to this rather basic question...

Since the capacitors at the power transformer primary to the chassis ground can cause shock hazards if they leak electrically, what was the intended function of these when they worked, and are they effective? If the chassis is now grounded with a 3 prong cordset, are these capacitors needed at all?
#2

Hi Tom glad you asked.
>what was the intended function of these when they worked, and are they effective?
There purpose is two fold. One is connected the hot side of the ac line and the chassis. This one acts the a rf filter against rf noise present on the ac line. The other one connects the neutral side of the line and the chassis. This one provides a ground for the things connected to the chassis thru the neutral side of the line.
The down side to this is it forms a capacitive divider so the chassis some low current ac on it to earth ground.

By connecting the third wire (house wiring ground) to the chassis it will eliminate the low current ac volt from the chassis but may increase the pickup of rf noise from the house wiring via lights, switch mode p/s, chargers, and wallwarts.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#3

Thanks.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Zenith H725
1.7-3.9 %, a modified Sine wave inverter is around 25%. Most generators from big box stores run 10% at a 50% load. What ...David — 04:06 PM
My Philco 37-116 Restore
I am having a heck of a time doing the alignment on the AM band. I can't seem to dial in the 1500 KC oscillator. I can h...dconant — 03:35 PM
Zenith H725
David - I think I understand but what units are you discussing (Low of 1.7, high of 3.9)? Budget constraints for Ham ...EdHolland — 01:43 PM
My Philco 37-116 Restore
You're doing great. I wish I could be more involved, but my mind is right now preoccupied with the reason I am here in ...morzh — 12:21 PM
My Philco 37-116 Restore
Hope you guys are still with me. I have moved on to the alignment. I completed the IF alignment which was pretty muc...dconant — 10:47 AM
My Philco 37-116 Restore
Hello MrFixr55, Thank you for taking the time to explain. I measured 50 volts where you say. Today the 370 volts at ...dconant — 12:51 PM
462ron
Oh that sucks. It’s something easily overlooked. Hopefully it’s nothing more than a resistor! Ron462ron — 08:08 AM
Philco 46-480 Electronic Restoration
Just confirmed that you are correct. It’s the function generator. I connected the signal output probe to one of the inpu...jrblasde — 07:52 AM
Philco 46-480 Electronic Restoration
Ouch, you may be right. Yes, it is solid state. It’s the signal output of my oscilloscope. May be time to crack that ...jrblasde — 07:27 AM
462ron
If you didn’t put a DC blocking cap between the signal generator probe and the plate of the 1st IF it’s possible you ble...462ron — 07:07 AM

[-]
Who's Online
There are currently no members online.

>