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Infrared Remote Controller Project by TK19 or SFH506

Infrared Remote Controller Reciever

Description:

This is a two part infrared remote controller circuit that consists of a transmitter and a receiver circuit pair. When you push the button on the 9V supplied transmitter circuit, a signal at 38kHz frequency is applied on the Infrared (IR) LED. As a result of the current passing through the IR LED, it illuminates the surround  with infrared light. By using the 1k potentiometer, oscillator frequency should be adjusted to 38kHz to operate the circuit properly.

The illuminated infrared light is detected by the IR receiver module. Generally IR modules has three pins and in our project we used the product of Telefunken, TK19 module. Instead of TK19, as an option you can use the SFH506 which is a product of Siemens or any other module for this purpose.
 

When the IR light touches the receiver, the third pin of the module sees logic-0 (low). Other case it is in the logic-1(high) position. So controlling the third pin gives us the information whether the button on the transmitter is pushed or not.

The J-K type flip flop in the receiver circuit controls the relay. When the button is pushed, relay gets in the position closed which was in open position before. So the device gets connected to the mains and starts operating. After second push, relay gets in position open and cuts the device energy...

 


 

500Hz Modulated Ultrasonic Transmitter

500 Hz Modulated Ultrasonic Transmitter Schematic

Description: 

Ultrasonic oscillations which are generated by unmodulated ultrasonic transmitters commonly for remote control are usually affected from other ultrasonic sources in the media and that's why we are giving a 500Hz modulated ultrasonic transmitter circuit here.

Voltage supply of the circuit is 9 Volts and any change of the value will change the frequency also. You can omit this difference by connecting a resistor between A and B nodes. You can find the value of the resistor by using this formula:

R =  (Vsupply - 7V) / O.6 Kohm where Vsupply is the new supply voltage value.

 

The multivibrator generates 500Hz modulation frequency. To avoid the frequency differences , tolerance of the circuit should not exceed %5.  

If the circuit components changed, then the frequency can be determined by using the formula below,

f = (1.44 x 1000) / (C2 x R3 x C3 x R2)

If C1 and C3 are nanofarads then R2 and R3 will be magaohms.

 

300 Watt MOSFET Real HI-FI Power Amplifier

300 Watt Mosfet Power Amplifier schematic

Description: 

When I set out to design this amplifier, my aim was to create a product most suitable for the reproduction of complex music and speech signals. Although I placed high emphasis on electrical characteristics, the single most important requirement is achieving an audibly superior sound, vivid spatial imaging and superb tonal clarity.

Although the average listening level is normally less than 10 watts, my design approach was to create an amplifier with ample reserve power, but biasing it for class A at average listening levels reducing cross-over distortion to extremely low levels.

There is not one capacitor in the signal path, improved the accuracy of the tonal characteristics of instruments and voices significantly.
The RAS 300 has almost zero phase distortion far beyond the audio range resulting in perfect resolution and totally un-coloured sound.

Amplifier Specification:
Maximum Output: 240 watts rms into 8 Ohms, 380 watts rms into 4 Ohms
Audio Frequency Linearity: 20 Hz - 20 kHz (+0, -0.2 dB)
Closed Loop Gain: 32 dB
Hum and Noise: -90 dB (input short circuit)
Output Offset Voltage: Less than 13 mV (input short circuit)
Phase Linearity: Less than 13 0 (10 Hz - 20 kHz)
Harmonic Distortion: Less than 0.007% at rated power
IM Distortion: Less than .009% at maximum power

 
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