Keywords: radio circuit diagram
This article collects 30 no-power radio circuits, suitable for the toss of the electronic technology, I wish you success! "No power radio" has already had a long history. The earliest ore radio (using lead zinc ore detection), although it is very simple, but in the history of radio development, it is still the entry pathway of young radio enthusiasts, training interest, familiar with basic principles, exercise production Skills have an uncharged superiority. No power radio does not consume electrical energy, but no power is required. The electric energy consumed by work is also derived from antenna, and the advantages and disadvantages of the antenna determines the reception. Good outdoor antennas, copper or bronzed wire, from intensity considerations should be greater than 4mm, 10 meters above the roof, 20 meters in pouring L, two ends with porcelain insulators, lead the line and the wall window have good insulation, The local power is strong, and the distance is simplified. At the same time, there must be a good ground wire, the wire is thick, the ground resistance is small, and it is deeply buried to the winter frozen soil. The connector of all wires is best soldered. Similar no power radio, there are also battery cells, which are iron copper or aluminum copper, zinc carbon electrodes, is buried underground apart from 10 cm, and the lead is also used for the same metal, if well, measured no-load voltage More than 1.8V. Radio passive components used in order to minimize losses, should be selected. Copper wire used to wind coils should be used as much as possible to use thick lines (or multiple shares); various support skeletons use organic glass; capacitors should use high frequency porcelain chips; electrolytic tantalums; high impedance of headphones; Variable capacitor air type; all diodes 2AP3, 2AP9; triode uses PNP high-frequency tube 3AG14 or 3AG80E, and the like. The main points of the production process are the use of epoxy or organic glass mounting plates, and the connection is stronger as short as possible, and the soldering must be sold, and the leading trajectory of the power radio is displayed by the specific circuit. 1. The simplest homogenous wave, shaped shaft radio, just replaced the ore with a diode. 2. Touch the magnetic rod to change the amount of coil inductance to tune the station. The distribution capacitance of the antenna side is equivalent to a resonant capacitor. 3, the method of changing the coil tap with the selection switch and the antenna distribution capacitor constitutes a resonant circuit to tune the station, and the capacitor C is a high frequency bypass capacitor. 4. Use the variable capacitance tuning, more uniform and meticulous, the antenna and the tap of the detection make the loop match. 5, the antenna and the detection are simultaneously using the selection switch to achieve the best match. 6, double-loop tuning circuit, so that the selectivity is greatly improved. 7. Single tuning dual circuit circuit, magnetic antenna coupling. 8, short magnetic rod coupling, two respective adjustments, omitting variable capacitance, K picking 1, interoperability, directly coupled to 2. 9, double circuit, tuning loop in L2. 10, three-circuit style, optimum selectivity, L1, L2, on the same tube, and the L3 can be wound. 11. There are parallel harmonic filters in the antenna, and suppress the stage. 12, listen to the short circuit, but the antenna to be extended to 50 m, the local connection to the thickening Φ2mm. Variable capacitor are connected in series, coils L1 L2 set into the regulator. The 180PF variable capacitance is 360pf double-linked to one of the links. 13, multiplier detection circuit, volume will be enhanced. 14. The full-wave circuit is improved by the selected tap performance. 15. It is not possible to become a portable in the city. 16, single tube completion of the detection, rectification, amplification circuit, left as a co-collector, right as a common base, suitable for the use of the strong station. 17, the electromagnetic power separate experiment, the measured radio strength next load voltage of 2.1V, the short circuit current 120uA. Be
18. Single loop independent detection, BG is only responsible for circulating. 19. Independent rectification power supply, BG completes the detection wave amplification. More see next page Next
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