[vts1134]

Originally Posted by old_coot88

Since the non-inverting output feature is not needed, it could be eliminated. This would allow the output level to take advantage of the full supply voltage (rather than half as it is).

It's always useful to think of a transistor as a triode analog - with the emitter the cathode, the base the grid, and the collector the plate.

In the sketch shown, start out with R2 as 4.7K, and R3 as 1K. Then for R1, first try 100K and work down in value till you get 0.7 V on the base. Once a usable output is obtained, then play with values for R2 and R3 and see if the output level can be improved any, all the while tweaking R1 to maintain 0.7V on the base.

Edit.. Error in sketch, 1K resistor "R2" should be R3. Dumb, dumb.

What is the 75ohm "dotted" connection to ground at the input?