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Contador Contador 74LS90 74LS90 With Pushbutton

a sequential circuit is built from a 74LS90 integrated circuit layers to create an account in binary form, provided by clock pulses to simulate the frequency, to display decimal numbers using a 74LS47 integrated which decodes binary to bcd. In this circuit uses a push button or to make a score of 0 to 9, also show how to eliminate mechanical bounce is what is produced by the switch.

Used Components.

- 3 CI 74LS90.
- 3 CI 74LS47.
- 3 Common Anode Display.
- 3 100R resistors Ohm 1 / 4 Watt.
- 4 Ohm Resistor 330R 1 / 4 Watt.
- 2 buttons.

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We have several utility 74LS90 IC, as a practical clock in this circuit show a generator unit square pulse provided by the LM555, we have our own clock by attaching a little more patience we have a full alarm clock and other features.

Used Components.

- 3 CI 74LS90.
- 3 CI 74LS47.
- 3 Common Anode Display.
- 3 Ohm Resistor 100R 1 / 2 Watt.
- 3 Ohm Resistor 330R 1 / 2 Watt.
- 1 1K ohm resistor 1 / 2 Watt.
- 1 buttons.
- 1 LM555.
- 1 Potentiometer 50K Ohm.
- 1 10uF 16V electrolytic capacitor.
- 1 100nF Ceramic Capacitor.

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With 555 74LS90 With LDR

Well this LDR use a counter which gives us the advantage of being able to put a laser on where to cut the incidence of the laser and the RDA can increase your score is very easy to design and has potentiometer which can adjust the sensitivity of the meter.

Used Components.

- 3 CI 74LS90.
- 3 CI 74LS47.
- 3 Common Anode Display.
- 3 Ohm Resistor 100R 1 / 4 Watt.
- 5 Ohm Resistor 330R 1 / 4 Watt.
- 1 buttons.
- 1 CD CI 4093.
- 1 Led.
- 1 Potentiometer 50K Ohm.
- 1 LDR.

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Contador Contador Digital Piano 0-999

74LS90 counter CD 4093.

In our setting is quite necessary to keep track auto industry either for the amount of product created or where we keep track of how many people go in one place among many more applications, for this we use an accountant who is a digital circuit capable of carrying a count up or down using a critical frequency with which it may carry an account in this circuit use a 74LS90 integrated circuit which is a 4-bit counter. The advantage of this chip is that your account goes from 0 to 9, its output is given in binary, this is where we use a binary to BCD decoder or in other words the 74LS47 decoder takes the binary numbers from the counter and can be adapted for viewing in a common anode display. In this case the frequency is given by a button, but the problem with this item because it gives small mechanical vibrations or logical errors which interfere greatly in the account for solving this problem is placing a CD CI 4093 a smith trigger nand gate which eliminates the rebound .

Used Components.

- 3 CI 74LS90.
- 3 CI 74LS47.
- 3 Display Common Anode
- 3 Ohm Resistor 100R 1 / 4 Watt.
- 5 Ohm Resistor 330R 1 / 4 Watt.
- 2 buttons.
- 1 CD CI 4093.
- 1 Led.

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This circuit called Mini-Piano or Electronic Organ, which generates sounds similar to those obtained in a piano keys are pressed in the central octave. Despite its small size can be a fun toy, a simple oscillator circuit is built with an IQ 555, which can be fed from 4.5V to 12V DC The essential idea is to generate a square wave with a frequency that the sound emitted by the horn is similar to what you get when you press the keys on a piano. The frequency depends on the value of resistance that are part of the oscillator circuit.

Note: Due to the tolerance of the elements, the frequency of the notes is approximate.

Note --- --- Frequency Resistors. ------- DO ------ 200Hz
R2 - R11 ------
RE 246Hz ------- R2 - R10 261Hz ------- ------ MI
R2 - R9
293Hz FA ------ ------- R2 - SOL
R8 R2 ---- ------- 329Hz - 349Hz R7 ------- ------
THE R2 - R6
SI ------ 392Hz - ----- R2 - R5
DO1 440Hz ------- ---- R2 - R4
RE1 493Hz ------- ---- R2 - R3

Used Components:

- 1 10K ohm resistor 1 / 4 Watt.
- 1 resistance 5.6K Ohm 1 / 4 Watt.
- 1 resistance 8.2K Ohm 1 / 4 Watt.
- 2 Resistors 6.8K Ohm 1 / 4 Watt.
- 2 Resistors 4.7K Ohm 1 / 4 Watt.
- 2 Resistors 3.3K Ohm 1 / 4 Watt.
- 2 Resistors 2.2K Ohm 1 / 4 Watt.
- 1 10nF Ceramic Capacitor.
- 1 100nF Ceramic Capacitor.
- 1 22uF 25V Electrolytic Capacitor.
- 1 LM555.
- 1 Speaker 8 Ohm 0.25W to 1W.
- 9 buttons.

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Mini Emergency Light Photocell

Emergency Light

this circuit designed in case of electrical power is fence without notice.

Operation:

The R1 is 100R Ohm to help decrease the current flowing in the capacitor C1 which reduces the voltage as a voltage source without transformer, diodes D1 and D2 rectify the wave, helps stabilize C2 as direct current, the idea is that the voltage passing through diode D2 properly polarized base transistor Q1, thus its collector remains in low level, which results in the transistor Q2 does not lead, and incidentally, it will block the conduction of transistor Q3. When no current flowing through D2, ie no AC, transistor Q1 does not conduct because its base has a low voltage level which means that its collector maintains the highest level from the batteries through R3. This allows the transistor Q2 is polarized step correctly and the transistor Q3. Allowing, with the latter step current flowing from the batteries through the led.

Elements Used:

- 1 Ohm resistor 100R 1 / 2 Watt.
- 1 Ohm resistor 100R 5 Watt.
- 1 10K ohm resistor 1 / 2 Watt.
- 1 resistance 2.2K Ohm 1 / 2 Watt.
- 1 220nF Polyester Capacitor 250V.
- 2 diodes 1N4007.
- 1 1N4148 diode.
- 1 Capacitor 4.7uF 25V.
- 3 2N3904 transistors.
- 3 Ultra-bright LED.
- 1 9V battery.