Schematic Diagram

Thursday, November 20, 2014

Sensor Ultraviolet UV Tron

Sensor Ultraviolet UV Tron is a flame sensor which is often used to detect the presence of sources of ignition under ultraviolet wave emitted by the fire. UV Sensor UV Tron can be applied with a microcontroller, such as ultraviolet UV Tron sensor is used for detecting the source of the fire on the robot in a firefighting robot contest.

Tron UV ultraviolet sensor accuracy is very high against the existence of sources of fire, so it is suitable for the purpose of fire fighting robot contest that a small fire source in the form of wax.

Power Amplifier Protector

Now you can protect your HiFi amplifier from damage due to overheating. This circuit will cut off power to the amplifier board at the time the temperature was high. Automatically connect the power when the temperature returns to normal. This circuit uses a sensor NTC Thermister heat and also has a warning sound and reset determination.

Amplifier circuit protector is using popular timer IC NE 555 as the temperature controlled switch. The trigger pin 2 is connected to a potential divider consisting Thermister VR and NTC. Thus the voltage on pin 2 depending on the resilience and determination Thermister VR. NTC (Negative Temperature Coefficient) Thermister has a high resistance in the normal temperature and the resistance decreases as temperature increases. Threshold pin 6 of IC is used to reset the IC if necessary. When the pin 6 voltage gets higher than the IC pin 2 will reset and the output is low.

Power Amplifier Protector Circuits

Power to the amplifier board is given by (NC) contact is usually connected from the relay and the switch S2. So that power to the amplifier board will be available through the NC contacts of the relay when the relay S2 and the state is not powered. Thermister resistance is governed by VR triggering pin 2 of IC peaks at normal temperatures. When the temperature inside the cabinet amplifier increases, resistance decreases so that it becomes conductive Thermister. This makes the trigger pin 2 of IC is low and its output is high. T1 works so that the relay energizes and the ringing of a bell. This will damage the electrical supply to the amplifier board. Relay will not be automatically powered when the temperature returns to normal.

Amplifier circuit protectors are very useful to protect your home sound system.

Power Amplifier for Laptop

Frequently, the sound yield from a laptops fabricated-in speakers is flat. A capacity intensifier is needed to get an elevated volume. Here is an effortless circuit to intensify the laptops sound yield.

The circuit is constructed around capacity enhancer IC LA 4440 (IC1) and a few alternate parts. LA4440 is a double channel sound capacity speaker. It has level twisting over a vast run of flat to towering frequencies with exceptional channel detachment. Inbuilt double channels prepare it for stereo and extension speaker provisions.

In double mode LA4440 gives 6 watts for every divert and in scaffold mode 19-watt yield. It has swell denial of 46 dB. The sound impact might be grasped by utilizing several 6-watt speakers. Associate binds 2, 6 and ground of IC1 to the stereo jack which is to be utilized with the laptop. Collect the circuit on a customary-reason PCB and encase in a suitable bureau. The circuit works off managed 12V capacity supply. It is suggested to utilize sound enter socket in the circuit plank. Utilize a decent hotness-sink for LA4440.

Wednesday, November 19, 2014

3 Level Audio Power Indicator

This circuit is designed to indicate the power level output of any audio amplifier. Its simple, portable, and displays three power levels can be adjusted to any desired value. For a standard power amplifier hi-fi stereo, the output values suggested are:

D5 illuminates at 2W
D4 illuminates at 12.5W
D3 illuminates at 24.5W

The above values were selected for easy setup, but other options are possible. IC1A is the input buffer, feeding 3 voltage comparators and LEDs drivers by means of a variable DC voltage obtained by R5 and C4 smoothing action. In order to achieve stability of adjustment, the supply of IC1 and trimmers R6 and R7 is reduced and is subject to 5.1V by Zener diode D1.

Very Simple Peak Indicator Circuit

This series is made to indicate that the amplifier has been given the maximum signal, the amplifier has the ability to be at its peak. if the lights do not mean the signal-plus volume.the way it works is the LED lights will light up when given a signal that more than 1.8 volts, the average amplifier will be saturated (maximum) if the signal was given more than this.

The circuit is very simple to the point that we forget that making a series of peak signal can in this way. circuit is mounted on the output tone control IC, master mixer output, or input power amplifier. This series does not impose on other circuits.survived the experiment!

Schematic diagram of a USB player

Usb series player is an electronic device or electronic circuit that functions as an MP3 player that is stored on a storage device such as USB flash.

In this usb circuit using an IC as a modifier of digital voice data into analog so that it can be applied to a headphone, or again through the power amlplifier strengthened so that it can be heard through the speakers. IC used in this circuit using IC PCM2902 as a modifier of a digital data into analog data storage.

Below is a schematic diagram of a USB player.

Schematic usb player

FM Radio Receiver Circuit with IC TDA 7012T

TDA 7012T FM Radio Receiver

FM Radio Receiver IC TDA 7012T is very simple, but it has an FM radio receiver sensitivity and good selectivity. Single Chip FM Receifer cool name of IC TDA7012T 7012T TDA is to build an FM receiver requires a few additional components.

Feature contained in FM receiver IC TDA 7012T is quite tempting to an FM receiver. Among features an FM receiver TDA 7012T is a low-voltage applications micro affability arrangement (MTS), Frequency Loked Loop (FLL) to 76 KHz range and selectivity of FM receiver with RC Filter. In an article by FM Radio Receiver IC TDA 7012T can be seen in the FM receiver circuit which can be made.

FM Radio Receiver with IC TDA 7012T

From the picture above components to make the FM Radio Receiver IC TDA 7012T as follows:

R1 = 8kΩ2

R2 = 10kΩ

R3 = 390Ω

C1, C3 = 10nF

C2, C6, C9, C16 = 100nF

C4 = 33pF

C5 = 25pF trimmer

C7, C10 = 1nF5

C8 = 820pF C11 = 1NF

C12 = 68pF

C13 = 220pF

C14 = 47μF 10V

C15 = 3nF3

L1 = 36nH

L2 = 1μH,

IC1 = TDA7021T

Hopefully useful and become an idea in the manufacture of Mini FM Receiver with IC TDA 7012T