As shown in the figure, the infrared remote control transmitter is an infrared pulse encoder with a carrier frequency of 38 kHz, which converts the keyboard state (Y1-Y15) into a series of modulated infrared pulse beams, each of which is in the pulse beam. The number of pulses corresponds to the keyboard that was pressed at that time. When the button is not pressed, the number of pulses is 16 (the amount is large).
1C3 adopts dual-time base block 556, and its left half (1/2 556) and R3, RP1, C1, etc. form a multi-resonator with an oscillation frequency of f1=1.44/(R3+RP1)Cl, which is about 512 Hz. The output is applied to pin 2 of IC2 as the clock CP of the up counter. The right half of 556 and R4, RP2, and C4 form an astable multivibrator, f2=1.44/(R4+RP2)C4, the oscillation frequency is about 38kHz, and its output is added to IC4-2 to connect the NAND gate. It is modulated by the pulse sequence appearing at point A in the figure, drives the triode, and emits an infrared pulse.
IC2 uses double binary plus counter CD4520, under the action of the falling edge of f1=512Hz pulse stipulated by IC3, it counts up, its output Ql (3 feet), Q2 (4 feet), Q3 (5 feet), Q4 (6 Foot) Four-line binary code is added to each corresponding end of ICl. ICl uses a 4-bit latch / 4-16 line decoder (output low select), when the input binary code is decoded, the output is low. Whenever the count state is 10000, since the Y terminal of 4515 becomes low, the RS flip-flop composed of 1C4-1 is set. The diodes D1 and D2 (point A) jointly controlled by the fifth output terminal of the counter and the RS flip-flop are turned on, added to the IC4-2 at the pulse repetition frequency fl/32, modulated the 38 kHz carrier, and driven to emit the infrared transmitting tube. Rainbow outside light.
Our company`s current transformers have high precision,wide range,small volume and good linearity that can be used to the field of electronic watt-hour meter, electric energy metering, electronic detection.
Performance
â—Power frequency insulation strength:The insulation between the primary winding and the secondary winding and the ground part of the CT can bear 4kV power frequency voltage for 1minute
â—Interturn insulation strength:The secondary open circuit, the primary winding through the rated current 1min, no inter-turn damage in the transformer
â—The deviation is better than the industry standards and national standards
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