Pulse shaper in the Schmitt trigger

Flicker transistors VT1 and VT2 has a pulse repetition rate is 10 times lower than the pulse repetition frequency of the second multivibrator, built on transistors VT3, and VT5. The first flip-flop operates independently and controls the operation of the second through the first transistor VT4. The structure of many amateur radio devices include pulse generators, which are now often build on elements of transistor-transistor logic [I]. At high values ​​of the frequency of such generators usually work well. What do we offer? If you have decided to receive an excellent rating and do not waste time searching for papers, essays and term papers, then you are on the right track. On our site referat-sochinenie. Widespread microcontrollers allows you to create on their basis of frequency meters. However, generally such designs have significant drawback, as they are designed to process signals from logic levels. Schmitt trigger, or single-ended trigger has a similar structure with symmetrical trigger, the difference between them lies in the fact that one of the collector-base circuit symmetrical trigger replaced with common emitter connection. As a result, the collector of transistor VT2 is not associated with the base and the load circuit VT1, VT2 is connected to the collector, it has little effect on the operation of the trigger.

Flicker - Wikipedia

By series connection of the two input transistor switches is inverted twice, i.e., as a result, does not change its logic state. Schmitt trigger is used to form an input signal of arbitrary shape signals received two standard level "0" and "1". Options schemes such generators are shown in Fig. The pulse voltage, for example from the output of the multivibrator is fed to the trigger input (capacitor C2), and switches it from one stable state to another. Thus at the outputs of the flip-flop alternately appear negative voltage - when any of the transistors is open at its collector voltage is nearly zero, and when the transistor is closed - on its collector is almost full "minus".

The pulse generator

Digital pulse counters "Completed: student gr. In-512Kabekenov M.Proverila: Otarbayev J. O.2010g. SoderzhanieVVEDENIE 3Printsip action 4Klassifikatsiya counters 5Summiruyuschy serial counter 6Vychitayuschy serial counter 7Reversivny serial counter 8Parallelny summing counter 12Schetchiki parallel transfer 12Razrabotka concept 14Formirovatel pulses 14Sostavlenie block diagram of the counter 15Sostavlenie functional circuit counter 16Prosteyshie single-bit pulse counters 16Vyvod 22Spisok used literature: 23 to inject CO development of electronics there is such a class electronic equipment, as digital. The function generator is called generators capable of delivering multiple types of signals, for example, rectangular, triangular and sinusoidalnyh.Raznoobrazie waveforms such generators can use them to test, debug and study a wide range of electronic equipment. The hysteresis loop for a perfect Schmitt trigger (image). Schmitt trigger (not Schmidt) - E-model two-position relay element, the static characteristic which has an area of ​​ambiguity (hysteresis loop). Structurally, the Schmitt trigger is an amplifier with sufficiently high gain, covered by a deep positive feedback.