Esa Heikkinen wrote: >> I'll see if I can produce a schematic as a pdf file. >> I presume you can also obtain red LEDs? >> > > LEDs are available ready in shelf... > > >> Can you obtain parts from Farnell or RS Components? >> > > Yes I can. One design goal for the whole system is that all parts should > be easily availale somewhere like Farnell, ELFA etc. distributors > selling small amounts. > > Esa
White emitter follower circuit attached. The LED ensures a temperature stable collector current for the npn common emitter device The 47 ohms in series with the output ensures stability with a capacitive load. Distortion of this circuit is lower than that of the 10544A. Some work is required - it should be OK but you will need to check that the circuit doesn't oscillate at VHF - can only go so far with spice. Bruce
White emitter follower.pdf
Description: Adobe PDF document
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