This is a device that uses ordinary telephone lines to send voice signals wirelessly at close range, and can be accessed through the telephone line. When the microphone is removed and the line is connected, the phone itself can be used to send voice without the need for a transmitting antenna or power supply (using a telephone line as an antenna and using a telephone signal as a power source). The transmitted signal is in the FM frequency band, and the FM receiver can be used to answer the phone line. The transmission frequency can be adjusted. This line is a radio frequency (RF) oscillator operating at 93MHz. The circuit is powered by a full-wave rectifier bridge. C1, C8, L3, T1 make up the FM oscillator. Each transmitter (TX) requires an oscillator to generate the RF carrier. Groups L1, C6 and T2 were successfully derated. The audio signal from the telephone line is coupled to the base of T1 through R3 and C2 to modulate the oscillator. This is achieved by changing the junction capacitance of the transistor. Junction capacitance is a function of the voltage at the base of the transistor. Such circuits usually require calibration. The resonance frequency of the L1, C6 amplifier circuit needs to be adjusted to match the resonance frequency of C1, C8, L3. In fact, this circuit can work without any calibration. When C1 is 27p, the transmission band of this line is 86 ~ 95MHz. The capacitance band using 22p is 90 to 95MHz (related to the coil pitch). If you want to use a frequency band above 100MHz, C1 should be replaced with a 10-15p capacitor.
The standard voltage of the telephone line is generally 48V (DC). If it is on an extension line, the line voltage may be as low as 39V. Note: When adjusting the frequency, the component cannot be held in the hand because the capacitance of the human body is sufficient to change the resonance frequency of the line. If a 150cm long antenna is added to the collector of T2, a larger transmission range can be obtained. This component is serially connected to one of the two wires connected to the phone, and both wires can be used. A wire connected to terminal 2 or 5 when in the UK. Cut the telephone line and connect it to the other end with an alligator clip. Pick up the phone, turn on the hook switch, adjust the frequency to about 93MHz, and take a portable FM receiver along the phone line to receive it. |
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1.0mm (.039") Female Headers
Overview
Whenever there is a need for fitting small-sized connectors in compact devices, the 1.0mm pitch female header, or sometimes referred to as header connector, is ideally suited for this application. Not only does this female header space-savvy, but it is also designed for vacuum pick and place that makes it suitable for high volume automated manufacturing.Antenk offers these low profile, easy-install, SMT or THM miniature female connector plugs at high quality and affordable China-quoted price, for board-to-board connection, snuggly fitting the pins of a male header and acting as a receptacle.
Assembly and service is simple with either vertical (straight), elevated or at a right angle configuration/orientation, which can dissipate current of about 1.0 A or less in a tape and reel packaging. The filleted corners can also remove shadowing allowing optimization of LED output.
Also, the 1.0mm pitch female headers are made to work in Arduino boards, Arduino Pro and Arduino Mega with either single or double-row female headers, facilitating connections for programming and incorporation into other circuits. They have the perfect height for clearing the USB-B connector and great for stacking multiple shields.
Female header always called as [Header connector", Antenk provide widely range of header connector, from 2.54mm (.100″ inch) pitch to 1.0mm (.039″ inch) pitch. The number of pins (contacts) is from 2 to 40 pins per orw. There are three type: Straight (Dip Vertical), Right angle, SMT (surface mount).
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Applications of 1.0mm Pitch Female Headers
Its small size is most suitable for PCB connections of small equipment and devices such as:
Arduino Boards
Architectural and sign lighting
Retail and display lighting
Fluorescent LED retrofit lighting
Cabinet or furniture lighting
Commercial / residential cove lighting
WiFi equipment
Gaming consoles,
Measurement instruments
Medical Diagnostic and Monitoring equipment
Communications: Telecoms and Datacoms
Industrial and Automotive Control and Test
Mount Type: Through-hole vs Surface Mount
At one side of this female header is a series of pins which can either be mounted and soldered directly onto the surface of the PCB (SMT) or placed into drilled holes on the PCB (THM).
Best used for high-reliability products that require stronger connections between layers.
Aerospace and military products are most likely to require this type of mounting as these products experience extreme accelerations, collisions, or high temperatures.
Useful in test and prototyping applications that sometimes require manual adjustments and replacements.
1.0mm vertical single row female header, 1.0mm vertical dual row female header, 1.0mm Elevated single row female header, 1.0mm Elevated dual row female Header, 1.0mm right-angle single row female header and 1.0mm right-angle dual row female header are some examples of Antenk products with through-hole mount type.
Surface-Mount
The most common electronic hardware requirements are SMT.
Essential in PCB design and manufacturing, having improved the quality and performance of PCBs overall.
Cost of processing and handling is reduced.
SMT components can be mounted on both side of the board.
Ability to fit a high number of small components on a PCB has allowed for much denser, higher performing, and smaller PCBs.
1.0mm Right-angle Dual Row female header, 1.0mm SMT Single row female header, 1.0mm SMT Dual row female header and 1.0mm Elevated Dual Row female Header are Antenk`s SMT female headers.
Soldering Temperature for 1.0mm Pitch Female Headers
Soldering SMT female connectors can be done at a maximum peak temperature of 260°C for maximum 60 seconds.
Orientation/Pin-Type: Vertical (Straight) and Right-Angle
1.0mm pitch female headers may be further classified into pin orientation as well, such as vertical or straight male header or right-angle female header.
Vertical or Straight Female Header Orientation
One side of the series of pins is connected to PCB board in which the pins can be at a right-angle to the PCB surface (usually called "straight" or [vertical") or.
Right-Angle Female Header Orientation
Parallel to the board's surface (referred to as "right-angle" pins).
Each of these pin-types have different applications that fit with their specific configuration.
PCB Connector Stacking
Profile Above PCB
This type of configuration is the most common way of connecting board-to-board by a connector. First, the stacking height is calculated from one board to another and measured from the printed circuit board face to its highest insulator point above the PCB.
Elevated Sockets/Female Headers
Elevated Sockets aka Stacked sockets/receptacles or Mezzanine are simply stacked female headers providing an exact distance requirement between PCBs that optimizes electrical reliability and performance between PCB boards.
Choosing this type of stacking configuration promotes the following benefits:
Connector Isolation - the contacts are shrouded preventing cable connection mishaps and good guidance for the mating header connectors.
For off-the-shelf wireless PCB module, stacking height is optimized with elevated sockets.
Offers superior strength and rigidity.
Polarisation prevents users from inverted insertion.
Single, Dual or Multiple Number of Rows
For a 1.0mm straight or vertical female header, the standard number of rows that Antenk offers ranges from 1 to 2 rows. However, customization can be available if 3 ,4 or n number of rows is needed by the customer. Also, the number of contacts for the single row is about 2-40 pins while for dual row, the number contacts may vary from 2-80 pins.
Pin Material
The pins of the connector attached to the board have been designed with copper alloy. With customer`s demand the pins can be made gold plated.
Custom 1.0mm Pitch Female Headers
Customizable 1.0 mm pitch female headers are also available, making your manufacturing process way faster as the pins are already inserted in the headers, insulator height is made at the right size and the accurate pin length you require is followed.
Parts are made using semi-automated manufacturing processes that ensure both precision and delicacy in handling the headers before packaging on tape and reel.
Tape and Reel Packaging for SMT Components
Antenk's SMT headers are offered with customizable mating pin lengths, in which each series has multiple number of of circuits, summing up to a thousand individual part number combinations per connector series.
The tape and reel carrier strip ensures that the headers are packaged within accurately sized cavities for its height, width and depth, securing the headers from the environment and maintaining consistent position during transportation.
Antenk also offer a range of custom Tape and reel carrier strip packaging cavities.
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ShenZhen Antenk Electronics Co,Ltd , https://www.antenkconn.com