Thanks guys,
Eric and Audioguru,
- I connected the LED one way and drew it the opposite. The LED works, for how long not too sure but will buy LED's of known parameters and will alter the LED resistor to suit. The one I used happened to be laying around.
- Current of 0.82A on a 180W element cold.
- Board will be a standard epoxy glass cloth based board, don't know the copper thickness, someone will make them for me.
- The circuit does work as shown, bar for the error on the LED, but will alter R3 for safety sake.
- Was reading another post today which spoke of much better options on opamps other than the old LM741. In my junkbox I have unused TL072, TL082, TL071, LM386, LM311, LM358. Could any of these be a direct replacement? Would I be better off upgrading now and altering the circuit, would need help though.
Thanks again
Andrew