Pulse amplifier (T442E)

Found in MIT documentation, this circuit is intended to amplify pulses for oscilloscope displaying. Observe the supply voltages.

Variable Duty Cycle (CIR102E)
Figure bellow shows another circuit that allows adjustments in the duty cycle of the output...
Intermittent Siren 7400 (CB519E)
This TTL siren is formed by two oscillators using each two Gates of a 7400. Frequency or the...
DC Control for Triac (CB1307E)
By the characteristics, this circuit can be used as command of triac by direct current, which is...