![]() ![]() The op-amp is now oriented so that the top and bottom row match the polarity of the V+ and V- pins, when they are connected to the battery later.It is important not to reverse the polarity to the op-amp as it will destroy it.From the leg opposite 4, moving right to left: 5, 6, 7, 8. Confirm the numbering of the legs of the amplifier after installation is as follows: on the bottom row, moving left to right: 1, 2, 3, 4.The pins are numbered consecutively from 1 starting on the bottom row and continue counter-clockwise on the other side of the device. Sometimes in addition to, or instead of, the divot, pin 1 has a circular depression or dot above it. To identify the pins, place the divot the left of you, pin 1 is the first pin on the left of the bottom row. This will allow an uncluttered layout, with the input (the antenna and tuning capacitor) on one side of the breadboard and the output (the speaker) on the opposite side.Place your op-amp (with the divot on the left) centrally on the board so that four pins are on one side of the trough and four are on the other. Most breadboards have a long trough running across the middle, separating the board into two equal halves.The printed logo, letters and numbers on the device are the right way up when viewed this way. Hold the op-amp so that the divot or dot is on your left. If there is no divot, there should be a small circular depression or dot on one corner. Notice that the op-amp has a small semi-circular divot on one edge, which is used to orient it properly. Wire strippers (or a similar item, like sharp scissors or a knife).Toilet paper tube, or small, non-conductive cylinder, 1.75–2 inches (44–51 mm) in diameter (glass bottle, cardboard/plastic tube, etc.). ![]() Operational amplifier, type 741 or equivalent (also called an op-amp X Research source x1).50–100 ft (15–30 m) insulated wire (any color for the antenna).22uF electrolytic capacitor, (10v or higher) (x1).200pF variable tuning capacitor (160pF will do.45–60 feet (14–18 m) of 26 AWG (0.4 mm) enamelled wire (for the inductor).15–20 inches (38–51 cm) of black insulated wire.15–20 inches (38–51 cm) of red insulated wire.These can be bought at most hardware stores, home centers, and electronics stores. You likely already have many of the parts you’ll need for this project, excluding some of the electrical components.
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