TM 11-5841-283-34-1/NAVAIR 16-30APR39-2
2-8. LOGIC DIAGRAM DESCRIPTION.
SYMBOL
DEFINITION
POLARITY INDICATOR. MAY BE USED AT
THE INPUT OR OUTPUT OF ANY DEVICE.
AT THE INPUT IT INDICATES THAT THE
ACTIVATING SIGNAL IS LOW. AT THE
OUTPUT IT INDICATES THAT AN ACTI-
VATED DEVICE OUTPUT IS LOW. AB-
SENCE OF THE SYMBOL MEANS INPUT
OR OUTPUT IS HIGH.
NON INVERTING AMPLIFIERS. ACTIVA-
TING INPUT AND ACTIVATED OUTPUT
ARE THE SAME STATE.
INVERTING AMPLIFIERS (LOGIC INVER-
TERS), ACTIVATING INPUT AND ACTl-
VATED OUTPUT HAVE OPPOSITE STATES.
DIFFERENTIAL AMPLIFIER. OUTPUT
ASSUMES THE STATE OF THE INPUT WITH
THE GREATEST AMPLITUDE PRESENT.
PHASE SPLITTER. A LOW INPUT CAUSES
BOTH HIGH AND LOW OUTPUTS.
GATED AMPLIFIER. CANNOT BE ACTl-
VATED UNLESS GATE INPUT IS LOW.
EL1BF114
2-8
Previous Page
