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To prevent false alarms produced by a single sensor activation, the alarm will be triggered only when at least two sensors activate simultaneously. The following diagram shows a 3 bit digital to analog converter implemented using a summing opamp amplifer. The R-2R Digital to Analog Converter uses only two resistance values R and 2R regardless of the number of bits of the converter compared to the summing amplifier implementation where each bit resistor has a different value. Depending on the state of bit B2, B1 or B0, the respective current I2, I1 or I0 is switched either to ground or to V- of the op amp. To analyse this circuit, first we observe that since the output is connected to V- through Rf, the opamp is in a negative feedback configuration.

Due to the nature of the resistance network and values, we can obtain the current values by inspection. When the Vc is less than VT-, Vo goes high (3.4V) and starts charging the capacitor C1 through R1.
When Vc crosses the threshold voltage VT+, Vo goes low (0.2V) and discharging of C1 through R1 begins. To get an approximate 60Hz clock, add a Divide-by-4 Ripple Counter at the output of this Schmitt trigger RC oscillator. By adding a divide by 16 and then a divide by 15 counter (divide by 240, 16*15=240), you can obtain a 1Hz clock frequency.

To derive the frequency equation of a 74LS14 schmitt trigger oscillator, we will make use of the universal time constant formula for the RC circuit. Yahoo , Facebook , Facebook , Twitter , Twitter , Google+ , Google+ , Myspace , Myspace , Linkedin , Linkedin , Odnoklassniki , Odnoklassniki , Vkontakte , Vkontakte , Google , Google , Yahoo , Yahoo , Rambler , Rambler , Yandex , Yandex , Gmail , Gmail , Yahoo! Designers Manufacturers , ??????? ????????? - ?????????? ???????????? , Gorgian Wikipedia - Free Encyclopedia , ????????? ?????? ????????? , Cambridje Dictionary Online , ????????? ???????? ????????? ?????? ????????? , Oxford Advenced Learner's Online Dictionar? , ??????????? ?????? - moazrovne,net, ???

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