This article introduces a simple radio circuit made of CMOS digital circuit CD4011, which has high radio sensitivity. CD4011 is a digital integrated circuit containing 4 NAND gates. Principle: Under normal circumstances, this kind of NAND gate circuit is made in two states of the switch, that is, output high level and low level. In fact, during the transition between high and low levels, there is a transition zone, and the middle part of the transition zone is basically linear. Therefore, the feedback circuit can be used to select an appropriate working state so that each NAND gate is in an amplified state. The following is the electrical schematic of the radio. L1 and C1 are the receiving resonant circuit, R1 is the DC negative feedback resistor, and C2 is the AC bypass function. The received signal is amplified by gate A at high frequency, then coupled through C3 and sent to the receiver. The voltage doubler detection circuit composed of D1, D2, R2, and C4 performs detection, and then it is further amplified by gates B, C, and D, and then sent to the headphone output. C1 in the figure can select a single variable capacitor, and the coil L can 80-100T is wound on the rod, the headphones should be high-impedance headphones, or a level one integrated audio amplifier circuit such as LM386 can be added, or a triode is used for impedance transformation. By increasing and decreasing the number of turns on the magnetic rod, the radio is in proper Within the frequency receiving range.
Draw-wire sensors of the wire sensor series measure with high linearity across the entire measuring range and are used for distance and position measurements of 100mm up to 20,000mm. Draw-wire sensors from LANDER are ideal for integration and subsequent assembly in serial OEM applications, e.g., in medical devices, lifts, conveyors and automotive engineering.
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