In reply to a post by pcoventry76:

I had an iphone charger blow up as I was pulling it out. It put me in Hospital for a week with burns and dysrhythmia.

abnormality in a physiological rhythm, especially in the activity of the brain

Hoping you get well soon pcoventry76....

Morning MHC

I don't know the details of today's switched-mode supplies; and to what extent the actual switching component is protected from Mains Spikes - any ideas?

====================

Switched-Mode Adaptors always remind me in principle, of the ancient Vibrator Power Supplies used with Car Radios in the late 1930s particularly, where a vibrating reed similar to an electric bell of the era, supplied a "square-wave" 12 V (or 6 Volts back then) DC to the Primary of a Step-Up Transformer, to achieve around 120 V DC after Rectification and Smoothing, to supply the HT required for the Valves/Tubes.

Edited by deleted (Fri 17-Oct-14 10:05:05)

Not by much!

A basic description:

Mains input between say 100 and 250v at 50 or 60Hz is fed into a bridge rectifier and a smoothing capacitor. That produces a very rough un-smooth DC at 150v or above. This DC is then switched on and off by a transistor at high frequency and varying duty cycle. The output may then pass through a transformer and is then rectified again and fully smoothed. This output is monitored by the controller chip which then varies the switching frequency and duty cycle control to the switching transistor.

So, not much at all.

In reply to a post by b4dger:

I bought a backup OR ECI modem and power supply from the Kelly engineer that installed my FTTC. Might have been £15 I didn't need to spend.

My Kelly engineer was so excited that I'd got everything up and running without a modem before he even came in he never gave me the modem. He's probably now sold it to someone for about £15

Thanks, MHC.

Very similar to the old Vibrators!

I think I know where a lot of eBay stock comes from!

I had to wrestle my old ADSLNation faceplate splitter off him - I guess he had a plan for that as well...

In reply to a post by eckiedoo:

Switched-Mode Adaptors always remind me in principle, of the ancient Vibrator Power Supplies used with Car Radios in the late 1930s particularly, where a vibrating reed similar to an electric bell of the era, supplied a "square-wave" 12 V (or 6 Volts back then) DC to the Primary of a Step-Up Transformer, to achieve around 120 V DC after Rectification and Smoothing, to supply the HT required for the Valves/Tubes.

They were still around in the late 50's.

I remember my parents had a car which, when the radio was turned on produced a loud buzzing noise and took a while to work (the valves had to warm up).

It was a great mystery to us until I learned how things work at school and wondered how the obviously valve operated device managed to work on 12V DC.

When I was about 13 or 14 it became obvious but inverters weren't exactly common place and this was the time when semi-conductors were becoming common.

Hi Seansmit17,

I'm sorry to hear you experienced this problem. We are interested to look into this in more depth with you and take any action necessary to put this right.

I understand you're registered on the TalkTalk Community. Can you post the above in a new thread on the TalkTalk Community, so we can get some more information from you to help us investigate. Once you've posted, please drop me (OCE_Mark) a Private Message there, to let me know, and I can pick up your thread.

Cheers

Mark
Online Community
TalkTalk

Done