[sdiy] Tube signal conditioner ?

Michael Buchstaller buchi at takeonetech.de
Thu Jul 11 16:08:02 CEST 2002


Hello friends,

i am on the quest for some kind of Schmitt-Trigger or
Comparator that allows me to clean up a possibly noisy
signal to an exact 0/1 level.

Purpose of this is for my tube DAC. At this moment, i am using
tubes to amplify the TTL output from my digityl circuitry to drive
a R/2R ladder. But, TTL seems not to have very exact signal
lexels (H is anywhere between 3.9 and 4.4 V, L between 0.4 and
0.9 V) between outputs of different chips.

So, i want to make some kind of "hard switching", by means of a tube.
How can i achieve this ? OK, i have the schematics of that old philbrick
tube opamp, and could use it as a comparator, but i feel there must be
a more simple solution for that.

Anybody any ideas ?


-Michael Buchstaller



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