Welcome to Australia's only Vintage Radio and Television discussion forums. You are not logged in. Please log in below, apply for an account or retrieve your password.
Australian Vintage Radio Forums
  Home  ·  About Us  ·  Discussion Forums  ·  Glossary  ·  Outside Links  ·  Policies  ·  Services Directory  ·  Safety Warnings  ·  Tutorials

Tech Talk

Forum home - Go back to Tech talk

 RFI from HPM power board
« Back · 1 · Next »
 Return to top of page · Post #: 1 · Written at 7:01:53 AM on 25 September 2022.
Simplex's Gravatar
 Simplex
 Location: Bathurst, NSW
 Member since 7 August 2008
 Member #: 336
 Postcount: 397

Yesterday purchased a four mains outlet power board HPM brand which also had two USB charging ports. Thought the USB charging capability would be handy for various tablets etc.

Placed the power board near my recently rebuilt Tasma M1331T and noticed quite an amout of RF hash had appeared. Some experiments with a AM transistor portable confirmed the hash was appearing from the power board and must be coming from the cheapo switchmode USB charger supply.

In the end pulled the power board apart and removed the USB chargers as wanted to have this power board placed near the Tasma.

As well noticed that even when power was removed from the power board the USB charger continued running for a full minute until a large capacitor discharged.

Have had this condition of wall warts and the like running for quite a while generating RFI even when unplugged from the power.

The curse of this modern society. Surrounded by the things.
 
 Return to top of page · Post #: 2 · Written at 12:13:52 AM on 26 September 2022.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6761

The curse of this modern society. Surrounded by the things.

Yep. Sad
 
« Back · 1 · Next »
 You need to be a member to post comments on this forum.

Sign In

Username:
Password:
 Keep me logged in.
Do not tick box on a computer with public access.

Vintage Radio and Television is proudly brought to you by an era where things were built with pride and made to last.

DISCLAIMER: Valve radios and televisions contain voltages that can deliver lethal shocks. You should not attempt to work on a valve radio or other electrical appliances unless you know exactly what you are doing and have gained some experience with electronics and working around high voltages. The owner, administrators and staff of Vintage Radio & Television will accept no liability for any damage, injury or loss of life that comes as a result of your use or mis-use of information on this website. Please read our Safety Warning before using this website.

WARNING: Under no circumstances should you ever apply power to a vintage radio, television or other electrical appliance you have acquired without first having it checked and serviced by an experienced person. Also, at no time should any appliance be connected to an electricity supply if the power cord is damaged. If in doubt, do not apply power.

Shintara - Keepin' It Real · VileSilencer - Maintain The Rage