Operational description

FCC ID: VA5JR561FM433

Operational Description

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FCCID_844164

VA5J VA5JR561FM433 R561FM433 Circuit Descriptions. Block 1: U100 can make the modulation by this block. By switching(between 0V and 3V) at VD1 the frequency modulation is done. Block 2: This is the oscillation circuit to radiate the radio frequency. Block 3: The third harmonic frequency 433.92MHz of block2 will be amplified at this By Q7, L17, C48. Block 4: Besides 433.92MHz will be removed by filter(L16, C46). Block5: The third harmonic frequency 433.92MHz of block3 will be amplified at this By Q6, L15, C43 Block6: Besides 433.92MHz will be removed by filter(L14, C40). Block7: This frequency 433.92MHz of block5 will be amplified at this by Q5, L13, C37. Block8: Besides 433.92MHz of removed by filter(L12, C32, C33, C34, C35). Block9: This is the LNA(Low Noise Amplify) circuit. Block10: This is the oscillation circuit to radiate the local oscillation frequency. X1 oscillates 433.92MHz(RX) by L10, L11, C20, C21. Block11: This is the mixer circuit. Which is amplified at block9 and is generated at block10(Q3, L7). Block 12: This is the oscillation circuit to radiate the second local oscillation frequency. By XT1, C30, C31. Block 13: This is the FM demodulation IC circuit. Block 14: This is the micro-controller. This block is consist of block 15, block16, block17, block18, block19, block20, Block21. Block 15: This is the radio frequency power enable and disable control circuit. Block 16: This is the real time circuit. Block 17: XT1 supply the real time clock to the U100

Block 18: The buttons of this product. When being pressed this remote starts to work. Block 19: This is the vibration motor circuit. Block 20: This is the buzzer circuit. Block 21: This is the LCD circuit.


Document Created: 2007-06-03 16:38:08
Document Modified: 2007-06-03 16:38:08
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