The 7805 is a regulated power supply circuit that outputs a positive 5V DC voltage. The IC uses an integrated voltage regulator 7805, C1 and C2 are input and output filter capacitors, respectively, and RL is a load resistor. When the output current is large, the 7805 should be equipped with a heat sink.
Many homes today have home appliances such as televisions, VCDs, video recorders, game consoles, and even video cameras and DVDs. The following is a TV signal repeater, which has the characteristics of simple circuit, low cost, and easy production.
The working principle circuit is shown in the figure below: The working principle of this circuit is that the RF signal is sent to the high-pass filter composed of C1, L1 and C2 via the 75 ohm RF cable, and the frequency below 45MHZ is filtered out, and then the transistor is passed through the transistor. The preamplifier consisting of 9018 is amplified and sent to the upc1651 by capacitor C3 for power amplification, and its output signal is transmitted through a whip antenna of about 60 cm. The 7805 and other components constitute a voltage regulator and power supply to provide 5V power for the upc1615.
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