As I mentioned I haven't read this article. I mentioned the LED in response to jollyrgr who wrote about the LED.Timothy Rasch wrote:Hi, about the preceeding letter I don't get why you are talking about a"led having a 5-15ma range is sufficient".
JPKNHTP Elektor Electronics (UK version), Electronics World (UK) Circuit Cellar (US) EPE Mag(UK) .The LED D2 and R1 (the related 2K resistor) see 12VDC. Assume that the LED is a standard red unit that drops a standard 1.5V. This leaves 10.5V for the 2K resistor. Taking the 10.5V/2000 Ohms gives 5.25mA. An LED MIGHT glow at that current level; the "usual" range is 20mA.
I no longer subscribe to EPE as with the loss of their main contributor they now publish articles from the Australian magazine Silicon Chip - apart from the fact that living in Australia I have direct access to SC and it would be silly to pay twice for the same articles plus the UK news, I don't like the SC format.
Other magazines (from the UK) that are still around are - Practical Wireless, Shortwave Magazine and Practical Television (I think they've dropped the Practical from the name). All in all the UK still has 6 monthly magazines, though I think Electronics World (used to be Wireless World) will disappear in the next few years and sadly EPE as well. Practical Wireless and Shortwave Mag are nowadays quite similar in content and I'd expect one of them to fall by the wayside by amalgamation.
There are though, many trade based magazines still in existence.