74LS247 DATASHEET PDF

XL datasheet-Engli MCAPI datasheet MBI Preliminary Da The LS is a pin version of the pin LS49 and includes full functional capability for lamp test and ripple blanking which was not available in the LS

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This counter can be used for either of the count-up and the count-down. This time, it is doing the way of using the count-down exclusive use. Because the grounding part becomes common, the LED must use the anode common type.

The four gate circuits are housed in the one package. The two gate circuits are housed in the one package. The output becomes the L level only when all four input terminals are the H level. The six gate circuits are housed in the one package. I used the a little biggish one for the minute display.

Each size is shown below. For the minute display : 33mm H x Install the LED for the minute display in the printed board earlier. Then, install the LED for the second display from behind to become the height which is the same as the minute display LED. Variable resistor For the frequency adjustment This is the variable resistor which adjusts the clock frequency to do the count-down. The frequency becomes high when turning clockwise. The count down time becomes short The measured result is shown below.

In case of the setting in the 99 minutes, it is possible to do the adjustment in the about 1. As for the resistance value, in the smaller one, the adjustment range becomes narrower and the adjustment is easy.

It is easy to adjust correctly. However, it is necessary to make it be possible to set to the 1 second in the adjustment range. The obtaining of the fixed resistance R4 is difficult.

Relay It closes the voltageless point of contact while the timer works to control the equipment outside. Because the relay is small, the electric current which can pour into the point of contact isn't so big. Hundreds mA? Because it is, you must prepare the relay which is appropriate to the outside to control the equipment which needs the big electric current. Diode With the rapid change when the electric current of the coil of the relay flows or broken, the high voltage occurs to the coil.

This diode is put to protect the transistor from the voltage. Even if it doesn't put, the transistor doesn't break immediately. It may are not 2SC I used because there was this at hand. The switch is the thin cylinder and can see the setting figure from the front. The circular cylinder has the small nail. You can set it by raising and lowering it with the finger. The one which I used this time is made by the JAE company.

It is composed of following components. You can use the necessary components by combining. This time, it is the 2-digit composition but you can compose the switch of a lot of digits by combining them. Spacer S 31 SM It uses when wanting to expand the interval of the installation of the switch.

This time, I used the two bodies of the switch, a couple of the end assembly and one spacer. The size in this case is 24mm H x 33mm W x 30mm D. Connector The control unit and the display unit of the timer are separated.

It connects the interval of it with the cable. It is convenient for the maintenance when installing the connector in the side of the cable. This time, it made the side of the control unit connect with the connector.

For the display : 18 pins For the BCD switch : 10 pins For the power supply : 5 pins Cable I used the numerous strand screened cable for the connection between the control unit and the display unit and the connection between the control unit and the BCD switch. For the display : 24 wires It is OK with the 16 wires.

For the BCD switch : 10 wires The screen part connects with the grounding. I protected the end of the cable with the tube Type which shrinks when applying heat. Terminal It is using to connect the power supply line, the start switch and the relay output. Because the about 40 pins are connected, you cut and use the necessary number.

Acrylic sheet The purple You can see the figure by the clearance when you see the LED through the purple acrylic sheet. It becomes beautiful like the design, too, because the body of the LED doesn't seem to be direct.

Display unit installation screw The display unit is installed in the hole of the case of the equipment which installs the timer. First, you put the acrylic sheet outside the case and fix the acrylic sheet on the case with the installation screw and the nut. Next, you install the display unit with the installation screw from inside the case. You adjust the interval of the unit and the case in the position of the nut.

Metallic stud It uses to install the printed board to the case. It is OK rather than the one which is made from the metal, too. It doesn't care in the plastic one.

Bypass capacitor The digital circuit handles the square wave. As for the square wave, like the frequency, the high frequency component is contained. The voltage changes rapidly for the high frequency component to be contained. The high frequency component sometimes has an influence which is bad for the circuit to work.

Because it is, the capacitor with the good high frequency characteristic can be put to the power circuit to lead the high frequency component to the ground the 0-V potential. The ceramic capacitor. Parts explanation for Count-down timer Counter 74HC It is using for the counter in the minute and the second.

Data sheet for 74HC Data sheet for 74LS Counter 74HC It is using for the counter in the minute and the second. Name Type Use Body of the thumbwheel switch. The switch cover in both sides Either side set The one is necessary in one piece of the switch composition.

It uses when wanting to expand the interval of the installation of the switch.

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74LS247 Data Sheet PDF

The LS is a pin version of the pin LS49 and includes full functional capability for lamp test and ripple blanking which was not available in the LS The composition of all characters, except the 6 and 9 are identical between the LS, , and the LS47, 48 and The LS47 thru 49 compose. The LS has active-low outputs for direct drive of indicators.

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74LS247 SCHOTTKY. Datasheet pdf. Equivalent

Manual zz. The LS is a pin version of the pin LS49 and includes full functional capability for lamp test and ripple blanking which was not available in the LS The composition of all characters, except the 6 and 9 are identical between the LS, , and the LS47, 48 and The LS47 thru 49 compose the and without tails, the LS thru compose the and with the tails. The LS has active-low outputs for direct drive of indicators. The LS and have active-high outputs for driving lamp buffers. Segment identification and resultant displays are shown below.

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