[GreenKeys] 120VDC power supply noise?

[Eugene Hertz]

based on your suggestion, I took my DVM and tested each diode. My DVM has a diode "mode" and each read "open" when biased in one direction and 80mv biased in the other direction. That seems sensible.

Also checked the ac cap with the DVM and sure enuf, it read 4uf! Now, I dont know whether that changes under stress and when AC is applied. Unfortunately, I don't have a real cap checker (like a sprague or heathkit) all I have is the DVM. 

For checking the DC cap, I did notice a different DC voltage using my DVM. 120VDC with cap in place, 110VDC with cap removed.

Any other thoughts?

Eugene


>-----Original Message-----
>From: WA5CAB at cs.com [mailto:WA5CAB at cs.com]
>Sent: Sunday, October 9, 2005 06:31 PM
>To: ehertz at tcaf.org, greenkeys at mailman.qth.net
>Subject: Re: [GreenKeys] 120VDC power supply noise?
>
>Did you check whether the 4ufd capacitor might have been open? And the 
>bridge rectifier for shorts or one diode open? 
> 
>I don't think that I ever encountered a germanium power rectifier. I guess 
>they could have been made for a brief period. 
> 
>In a message dated 10/9/2005 6:26:24 PM Central Daylight Time, 
>ehertz at tcaf.org writes: 
>> I can add that this power supply is a western electric "rectifier" model 
>> KS5928.L7 
> 
>Robert Downs - Houston 
><http://www.wa5cab.com> (Web Store) 
>MVPA 9480 
><wa5cab at cs.com> (Primary email) 
><wa5cab at houston.rr.com> (Backup email) 
>_______________________________________________ 
>GreenKeys mailing list 
>GreenKeys at mailman.qth.net 
>http://mailman.qth.net/mailman/listinfo/greenkeys 
>