Schmitt Trigger; Ramp Capacitor Amplifier Block Diagram; Synchronizing Operation - HP 211B Operating And Service Manual

7° \F AMPLIFIERS NOT IN CIRCUIT
SWITCHING
LEVELS
AMPLIFIER
! OUTPUT
Figure 4-3. Ramp Capacitor Amplifier Block Diagram.
4-15. SCHMITT TRIGGER. 4-16. SYNC INPUT CIRCUIT
Four diodes, CR23-CR26, in a bridge configuration
limit the maximum amplitude of the input synchro-
FREE RUNNING
SYNCHRONIZED SIGNAL SCHMITT TRIGGER =
UPPER
> 50%
LOWER
FREE RUNNING SIGNAL
/
SYNCHRONIZED SIGNAL
| OUTPUT SPIKE FROM Q25
Ist OR Q26
SYNC. PULSE
Figure 4-4. Synchronizing Operation.
4-3