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 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. |
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 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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