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Hi Eric,ericgibbs said:If a TTL output is high and its connected to a TTL input which requires 1.6mA, where is the current coming from, if not the driving source.???
ericgibbs said:I suspect like me, you cut your teeth on things like 741's, EF50's and EL84's would I be wrong?.
Yeah, I'll believe 3.9V with no load, and 27mA when connected to the base, but not both simultaneously.ericgibbs said:hi,
The point that puzzled me was the +3.9V at pin12 while driving 27mA into the
transistor base. It should be lower than 3.9v, as the Vbe on the transistor is around 0.7v
Read your edit.
Eric
audioguru said:I remember that Philips vacuum tubes were stamped Mullard.