Current Flowing Indicator.

[Yorkie]

Just a small point: I appreciate that what Joe wants to do is to have an LED indicator - not an in-line Ammeter, but analogue 0-5A panel meters cost just £2.50 post free from Asia Engineer, or digital backlit blue panel meters cost just £4.00 post free. True, the digital ammeters do need a separate power supply and must not share the same ground as the circuit being measured, but their voltmeters don't - nor do they need a shunt. If the object of the exercise is to explore the technicalities of using an LED to give an indication of current flowing, rather than a meter, that's one thing, but if the aim is to provide a cheap alternative to using a meter, given that meters are now so cheap, there's really no economic argument to support the use of an LED

http://www.ebay.co.uk/itm/New-Analog-AMP...ltDomain_0&hash=item56427c509f

Asia Engineer have about 600 different meters, both analoge and digital for just about every requirement. I've used several for small projects and found them to be excellent. True, they take about 3 weeks to arrive on a slow boat from China, but at such low prices and free P&P, who's going to complain about that? Not me, that's for sure!!

Well worth browsing their 'e-bay shop'.

Have fun!

Looking forward to the Swapmeet!