5 May
2012
5 May
'12
1:44 p.m.
On Apr 30, 2012, at 2:46 PM, Chuck Guzis wrote:
IIRC the 74HCU04 is just complementary pairs of MOSFETs, so it';s not
suprising it works as an amplifier. I've seen similar things (possibly
usign the 4069UBE) used as the tape input circuit on older microcomputers.
Motorola also offered a bubble-pack of assorted
milliwatt RTL TO-100
devices as part of their experimenter's kit line. (Fat chance of
that ever happening again!). The little booklet that came with it
was interesting in that perhaps as many linear applications were
described as digital ones.
That's pretty neat! The 74HCU04 datasheet (the Philips/NXP one,
anyway) has an application circuit for it as a "poor man's amp", running it as an inverting amplifier. The original
Nintendo
actually used this as its mixer/line amp stage for the sound
output:
IIRC one of Vonada's lawas is that 'digital circuits are made from
analogue parts' so it's hardly suprising yuo can sometimes go back to the
analogue function.
-tony