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Description counter 0-9 This counter 0-9 in easy to assemble, basic to use for other more complex where we make use of integrated circuits didactically as these could be replaced by other more complex circuits with simple application of microcontrollers. Counter operation 0-9. This counter circuit is formed by a generator essentially comprises a wave 555 which functions as a circuit astable multivibrator operating this type is characterized by an output square waveform with width defined by the designer.The outgoing wave frequency can be controlled by the resistor is connected between pins 7-8 and 2-7 in addition to the electrolytic capacitor connected to pin 2 of land. The pulse output can be varied by 100K ohm potentiometer (RV1). Circuit counter The 7490 is a counter asynchronous decades BCD to binary, this counter counts the falling edges of the clock pulses generated by 555, 4 outputs move counter to count in binary 0 in BCD (0000) to 9 BCD (1001). To counter operation must co...

This is the simple 10 Mhz universal counter Circuit Diagram. The ICM7216A or can be used as a minimum component complete Universal Counter.   10 Mhz universal counter Circuit Diagram   This circuit can use input frequencies up to 10 MHz at INPUT A and 2 MHz at INPUT B. If the signal at INPUT A has a very low duty cycle it may be necessary to use a 74121 monostable multivibrator or similar circuit, to stretch the input pulse width to be able to guarantee that it is at least 50 ns in duration.

Digital Step-Km Counter Circuit Diagram. This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants' pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1 (the least significant digit) shows hundreds meters and its dot illuminates after every 50 meters of walking. A beeper (excusable), signals each count unit, occurring every two steps. A normal step was calculated to span around 78 centimeters, thus the LED signaling 50 meters illuminates after 64 steps (or 32 operations of the mercury switch), the display indicates 100 meters after 128 steps and so on. For low battery consumption the display illuminates only on request, pushing on P2. Accidental reset of the counters is avoided because to reset the circuit both push buttons must be operated together. Obviously, this is not a preci...

The recent tsunami in Japan and the on-going calamity with the Fukushima nuclear power plant has apparently greatly increased sales of radiation meters, not only in Japan but elsewhere around the world. This device will allow an estimation of the level of radioactivity, being sensitive enough for background radiation monitoring or to provide an estimation of the level of radioactivity from sample objects such as Thorium gas mantles in LPG lamps. The circuit is compatible with several Geiger Muller tubes and three types of indication are provided: the good old-fashioned audible click with each discharge, a flashing LED or an analog meter providing a rough average of radiation levels. Geiger Counter Uses Cockroft-Walton Multiplier Circuit A normal background count in New Zealand with the smaller GM LND712 tube is around 30 counts per minute, while the larger and more-sensitive LND7312 pancake tube will count about four times this figure. Both GM tubes will detect alpha, beta and gamma ra...

Free circuit dot com would like to present the frequency counter circuit uses IC MK50398 main operation and a multiplexed seven segment display and uses timer 1 to count edges of the input signal. The circuit uses the easier method of direct frequency measurement that is simple to do but means that the number of digits displayed depends on the input frequency. The MK50398 is the one modern decimal counter up/down of six tens IC, with control of screen LED of seven segments and flip-flop of storage. Counter it can measure additive and abstractively. The IC MK50398 is ideal for manufacture frequency counter as the particular circuit.   Components part list IC3=MK50398 IC1-2-4=4093 IC5-6=4017 IC7=Not exist IC8=7812 TR1=220V-110Vac / 12V 0.5A R1=10Kohm R2-8=1Kohm R9=8.2Kohm R10=10Kohm R11=22Kohm R12=10Kohm C1-6=1nF 100V C2-3=150pF 100V C4-5=150pF 100V C7=47uF 25V C8-9-12=100nF 100V C10=1000uF 25V C11= 470nF 100V D1=12V 0.5W Zener D2=1N4148 . LD1-6 =7 segment Display Common Cathode D3-...

Digital visitor counter is a reliable circuit that takes over the task of counting Number of Persons/ Visitors in the Room very Accurately. When somebody enters into the Room then the Counter is Incremented by one and when any one leaves the room then the Counter is Decremented by One. The total number of Persons inside the Room is displayed on the seven segment displays.The microcontroller do the above job it receives the signals from the sensors, and this signals operated under the control of software which is stored in ROM. Digital visitor counter Digital visitor counter