Simple Guitar Effects Circuit

[English]
The series of guitar effects that will we make is very simple. IC UM3561 to producefour different sound effects, the output at Pin 3 will be amplified by transistor 2N2222. Both 4-way switchs will control the sound effects. Position 1 (as drawn) into police siren, position 2 is the sound of fire trucks, ambulances and position 3 is 4 is the effect of machine guns. This is following circuit schemes :

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Multivibrator Monostable IC 555 Circuit

[English]
Monostable multivibrator circuit IC 555 is a pulse generator circuit which pulse duration is determined by the RC that is connected to the IC timer 555. In the vibrator, one output will be stable for another quasi-stable (unstable). To trigger the automatic output of a quasi-stable state to stable state deposited by an external capacitor that is connected to a reference level. The time needed depends on the pulse width in storage. Output transition from stable state to a quasi-stable state is triggered by external factors.

The capacitor C should be free through the barriers of RA. RAC constant time constant is bigger, longer time required for the capacitor voltage to reach 2 to 3 VCC. In the other words, the time constant RC of the output pulse width control. Pulse width of the circuit can range from micro-seconds to many seconds. This circuit is widely used in industry for diverse of time circuits.

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9 Seconds Timer with 7 Segment

[English]

This circuit counts down for 9 seconds with 7 segment display. When the switch is closed, the CD4010 up / down counter timer attached to the 9 and 555 disabled with the output held high. When the switch is opened, the timer produces a second clock signal, reducing the counter until the count 0 is reached. When the count reached zero, the implementing signal at pin 7 of the timer into a low, giving power12 volt to relay and stopping the clock with a low signal on reset line (pin 4). Relay will remain live until the switch is again closed, resetting the counter to 9. The first second clock signal from the timer 555 can be adjusted slightly longer or shorter by increasing or decreasing the resistor value on pin 3 of timer.

Note:

* This circuit can be activated from the 9V battery or 12V DC power supply.

* Time delay can be varied by changing the resistor value on pin 3 IC555.

* The switch push button to start the timer.

* Equipment can be connected via relay contacts.

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Simple Running Led / Letter Circuit

[English]
This is a circuit that displays a run message in which letters are formed by the LED lights are arranged progressively. After all the letters the message has been lit, the circuit will resets.

The circuit is built by IC CD4017BC that use counter. Either feature is the provision CD4017BE of ten fully decoded outputs, making this IC ideal for use in avariety of sequencing operations. In this series only one high-voltage output is fixed and other output will switch to high voltage in a row each clock pulse comes. NE555 timer IC is installed as a stabilizer 1Hz multivibrator which clocks the IC2 forse quencing operations. At reset, output pin 3 to rise and make the transistor T7 at the ready. The output of transistor T7 is connected with the letter 'W' from the wording ofthe LED and thus the letter 'W' lit.

At the time of the first clock pulse comes, pin 3 pin 2 decreased and increased.Transistors T6 to work and light 'E' lit. Previous letter 'W' also remains on because the forward bias transistor T7 via diode D21. In the same way, the arrival of each pulse in a row, other letters from the screen also turns on and finally all the letters are lit.

On the next clock pulse, pin 6 will be valued logic 1 and reset circuit, and repeated insequence. The sequence led operation frequency is controlled with the help potmeter VR1. The screen can bebe repaired on veroboard properly sized and connected to supply ground of the public ( between 6V - 9V ) while the anode of the LED must be connected to the emitters of transistors T1 through T7 as shown in the circuit . The series above is very flexible and can be transferred with a large number of LEDs tocreate any design LED fashion jewelry. With two circuits connected in the same manner, multiplexing of LEDs can be done to give effect to move the display.

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Li-Ion Battery Charger Using USB Port

[English]
The USB port is one of the means of much use. Besides being used as a port interface to the device I / O computer, this port is also used as Li-Ion Battery Charger. The USB port capable of supplying a maximum voltage of 5.25 V with maximum current 0.5 A. Therefore, the below series can only be used to charge Li-On batteriesalone. As the LM3622 controller IC is used. The main function of this IC is as a determinant of late and battery charging. Circuit Li-Ion battery charger can you see in the picture below :

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12 Volt Adapter Circuit

[English]

At this time no longer have to bother looking for the op-amp, transistors and other components to realize a large series of regulators, because these series have been packaged into a fixed voltage regulator IC. Currently, many components known as78XX series voltage regulator remains positive and 79XX series is a voltage regulator to remain negative.

In fact, these components are usually already equipped with current limiting and temperature control (thermal shutdown). This component is only three pins, and by adding some components you can have a circuit with power regulation was good. For example, 7805 is a voltage regulator to get a 5 volt, 12 volt voltage regulator7812, and so on, for example, while the 79XX series is the 7905 and 7912, respectively, negative voltage regulator 5 and 12 volts.

The adapter that we will create this having an output (output) 12 volt regulated well, some people say pure voltage (real). If the components are installed in accordance with the scheme below, the adapter sets this series will have a load current of 5 amperes, if you want the adapter is capable of providing a greater flow you can add apower transistor (2N3055) and replace the diode bridge with diodes that have higher amperage. The output circuit of this adapter can be used to run the tape car, radio transmitter, CCTV cameras, and other electronic equipment. I recommend to use the cooler on the transistors, because the use of the old adapter causes the heat and thus extend the make useful life of your adapters.

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