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Circuit explanation of Ultrasonic Range Meter unit
Transmitter circuit I am using two 555 timer ICs for the transmitter circuit of the ultrasonic. As for the operation of the oscillation circuit which used 555.
IC1 is the oscillation circuit to control the sending-out time of the ultrasonic pulse...
Ultrasonic Range Meter
I will introduce about the making of the range meter which used the ultrasonic on these pages. This range meter uses the ultrasonic of about 40 KHz.
The way of measuring measures the time which the ultrasonic returns
from the measurement object. The ...
Circuit explanation for Count-down timer
Minute counter circuit
I am using 74HC192(Presettable Synchronous Up/Down BCD Counter) as the counter. There is 74HC190 and so on in the counter which can be
downed in the count. I used this counter because I used the clear
terminal as the second co...
Count-down timer
I assumed the following function to make the circuit. (Specification)
It uses the subtraction method for the timer.
The subtraction is begun (the timer start) with the non lock switch.
It displays the remainder time in the digital.
While the time...
Variable Resistors
There are two general ways in which variable resistorsare used. One is the variable resistor which value is easily changed,like the volume adjustment of Radio. The other is semi-fixed resistorthat is not meant to be adjusted by anyone but a technicia...
Resistors
The resistor's function is to reduce the flow of electric current.This symbol is used to indicate a resistor in a circuit diagram, known as a schematic.Resistance value is designated in units called the"Ohm." A 1000 Ohm resistor is typically shown a...