The Quad Logic Gate

[Pehr]

I'm running my QLGs on 12V and the output levels are a little too low for my system. Abt 5V

Would it be as easy as just omitting the 680 Ohm resistor, to increase the output voltage level, or do I have to fiddle with both the 680 and 820 Ohm resitors?

Or would that damage the LED?

http://cgs.synth.net/modules/pic/schem_cgs39_quad_gate.gif


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[andrewF]

change the 680 to a lower value.
say 100 Ohm will give you about 9V output
200 ohm ~ 8V

[Pehr]

Thanks!
100 Ohm it is

[Pehr]

I reduced the 680 to 100 and incr the 820 to 1.2k. So now the gate out is abt 8.9V. Good enough for me !