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A retriggerable monostable multivibrator and a D flip-flop can form a simple, yet reliable frequency comparator that compares an input frequency with a predetermined reference. To determine whether an input frequency (f) falls between two known frequencies, f1 and f2, two one-shot/flip-flip combinations are used, as shown. Here both the one-shot and the flip-flop ICs are wired for positive-edge triggering. Each input pulse causes the monostable output to go high for the period of its preset timing interval. The flip-flop is triggered simultaneously, but its output is determined by the state of its D input at the time of trigger threshold. If the period of the input frequency is shorter than the preset timing of the monostable, a constant high level will be present at the D input, forcing the flip-flop’s Q output to remain high. If the input frequency period becomes greater than that of the monostable, the flip-flop’s Q output will go low. VR1, VR2, and C1, C2 determine the value of

Introduce Lenovo Debuts 5-Inch Vibe X Smartphone . Lenovo unveiled its new Vibe X, a fairly clear-cut smartphone, at IFA Berlin on Thursday. The 5-inch apparatus arrives with a 1,080p IPS display, a quad-core, 1.5GHz processor, a 13-megapixel camera (coupled with an oddly powerful 5-megapixel one on the front), 2GB of recollection and 16GB of storage. The specs are admirable, but they aren't the best out there. although, add in the premium polycarbonate body — which is just 6.9 millimeters thick and weighs about a quarter of a pound — and Vibe X becomes a solid lightweight competitor in the crowded 5-inch Android arena. On the programs edge, just like most of its new brethren, it sprints Android 4.2. The Vibe X will never reach European or the U.S. coastlines, we've been notified. Price and release designated day are not yet available.

Single phase capacitor motors are widely used in household a ppliances such as water pump , washing machine, freezer, air condit ioning . Simple construction with small resources and working with electricity supply voltage 220 V, therefore ma king the capacitor motor is widely used in household appliances. Stator winding consists of the main winding terminals U1-U2 notation, with the notation and auxiliary winding terminals Z1-Z2-mesh nets connected to the terminals L1 and U1, and the neutral wire connected to the terminal N U2. Capacitors work function to the main winding phase angle difference with the auxiliary winding approaching 90 ° . Setting the direction of motor rotation can be done with a capacitor (see figure): • To produce rotation to the left (counterclockwise) working capacitor CB connected to the terminals U1 Z1 and Z2 and the terminal is coupled with the terminal. • Round to the right (clockwise) a capacitor connected to the terminal work Z1 and Z2 terminals U1 and U1

At this time amplifier circuit based on IC KA2201, TBA820M, LM820M, and U820. You can use all ic is the series under the scheme. This amplifier circuit has a very small output power or low at 2W. Required supply voltage from 3 volts to a maximum of 16 volts. Below is a scheme of this power amplifier Part List R1 = 100K R2 = 120R R3 = 100R C1 = 100nF C2 = 100uF C3 = 470uF C4 = 220pF C5 = 47uF C6 = 100uF IC = KA2201 , LM820M , TBA820M , U820M

This circuit is a doorbell with counter , that means it counts how many times the bell is triggered . It uses a chip synthesizer sound, the HT -2811 ms nothing prevents you from using another device sound generator . The HT -2811 reproduces the sound of a " ding-dong" doorbell . Besides this ic , the circuit includes a CMOS 4026 and Display Driver IC which counts the total number of visitors .  Electronic Doorbell with Counter Circuit Diagram