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555 Timer Explained The 555-Timer IC (Integrated Circuit) is one of the most popular and widely spread ICs available with uses for nearly everything from clock timing, signal delay, pulse generation and signal oscillation applications. In Monostable mode the 555-timer IC forms a Resistance-Capacitance circuit with the external resistor and capacitor.. Boost mobile cerca de mi

Strength in numbers. You'll find Geek Squad in every Best Buy store, with more than 20,000 Agents across the country ready to help. See complete terms and conditions. For customers who purchased a plan prior to 9/10/15, see previous plan details. Technical expertise. Personal service. This way, we may call it a sequential traffic light system. The working and operation of traffic lights control circuit, the main IC is 4017 counter IC which is used to glow the Red, Yellow and Green LED respectively. The 555 timer acts as a pulse generator providing an input to the 4017 counter IC. The glowing time of certain LED lights ...Press CTRL+C. In the worksheet, select cell A1, and press CTRL+V. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button. Combines the last four digits of the SSN with the "***-**-" text string ... HP Color LaserJet Enterprise M554, M555, and MFP / Flow MFP M578 in-box color cartridges may have higher yield than stated for printer units manufactured before 2021. One-year, next-business day, onsite warranty. Warranty and support options vary by product, country and local legal requirements.Sep 5, 2023 · Output (OUT): This pin can either source or sink current. It’s the main output of the timer. Depending on the mode of the 555 timer, the output pin might produce a continuous square wave (Astable mode) or a single pulse width (Monostable mode). Reset (RESET): When a negative pulse is applied to this pin, the timer resets and the output goes low. The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and ...Aug 10, 2020 · As shown herein, the compendium of mutational driver genes derived from the analysis of the cancer exomes currently in the public domain (~28,000) comprises between 500 and 600 mutational drivers ... Temperature Conversion Formula for all the temperature units including Celcius, Fahrenheit and Kelvin are given here. Learn Celsius to Fahrenheit formula at BYJU'S with the help of solved example questions In short, the 555 timer chip works by detecting threshold voltage levels. Pin 2 detects a voltage below 1/3 of the supply voltage to turn the IC on. And, pin 6 detects a voltage above 2/3 of the supply voltage to turn the IC off. I’m a student with a slow brain, learning with illustration causes me more understanding.555 Timer Tutorial. The 555 Timer is a commonly used IC designed to produce a variety of output waveforms with the addition of an external RC network. We …Digital counters are needed everywhere in this digital world, and 7 segment display is one the best component to display the numbers. Counters are needed in …Digital counters are needed everywhere in this digital world, and 7 segment display is one the best component to display the numbers. Counters are needed in …Unless otherwise stated, all performance claims are based on theoretical performance. Actual figures may vary in real-world situations. The actual transfer speed of USB 3.0, 3.1, 3.2, and/or Type-C will vary depending on many factors including the processing speed of the host device, file attributes and other factors related to system ...For a directory of departments call: 1-833-BANK-FNB (1-833-226-5362) For assistance with bank accounts, online access, or debit cards call: 1-800-555-5455 For full functionality of this site it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser.(a) When hearing is required. (1) A PHA must give a participant family an opportunity for an informal hearing to consider whether the following PHA decisions relating to the individual circumstances of a participant family are in accordance with the law, HUD regulations and PHA policies: (i) A determination of the family's annual or adjusted income, and the use …Internal block diagram [1] The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications. It is one of the most popular timing ICs due to its flexibility and price. Derivatives provide two ( 556) or four ( 558) timing circuits in one package. [2] We would like to show you a description here but the site won’t allow us.Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack ExchangeThe 555C Classic Series features simple relay controls for easy field repairs, and compact handle design to prevent interference with conduit when bending. Sold without shoes. 1/2" – 2" Rigid/IMC or EMT Shoes can be purchased separately. The optional PVC-coated rigid conduit shoe group can be used on all 555 series benders.Here we report an electrochemical molecular intercalation approach to a new class of stable superlattices in which monolayer atomic crystals alternate with molecular layers. Using black phosphorus as a model system, we show that intercalation with cetyl-trimethylammonium bromide produces monolayer phosphorene molecular superlattices …The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications. It is one of the most popular timing ICs due to its flexibility and …555 Timer is a linear device and it can be directly connected to the CMOS or TTL (Transistor – Transistor Logic) digital circuits due to its compatibility but, interfacing is must to use 555 timer with other digital circuits.. Being an integral part of electronics project, 555 Timer IC is very often used in simple to complex electronics projects. The standard 555 timer IC is …The TT-555 is a direct output temperature Sensor used to measure air temperature, especially in fan-coil units etc, and contain either a high quality thermistor, nickel or platinum sensing element. The standard cable length is two metres of 2-core screened cable. Longer lengths can be made to order. --------- Low Smoke Zero Halogen cable is ...Moreover, the fabrication process can be scaled to produce a large array of 6,300 transistors over an area of around 4.4 × 4.4 cm 2 ( Fig. 1c ); this array is semi-transparent and has skin-like ...Multisim - Circuit Design with a 555-timer. I am currently working on a design project. I am trying to get my 555-timer to turn on (1-minute) a motor and LED when activated and then turn back off after the 1-minute has passed. I am taking the output of the 55-timer to a IRF520 (power MOSFET) to serve as a amplifier.5 U.S. Code § 555 - Ancillary matters. This section applies, according to the provisions thereof, except as otherwise provided by this subchapter. A person compelled to appear in person before an agency or representative thereof is entitled to be accompanied, represented, and advised by counsel or, if permitted by the agency, by other ...Shop OEM Volkswagen Part # 11A827555C9B9 (11A 827 555 C9B9, 11A-827-555-C-9B9, 11A827555A9B9, 11A827555C 9B9). Liftgate Trim (Upper). From 02/22/2021. In short, the 555 timer chip works by detecting threshold voltage levels. Pin 2 detects a voltage below 1/3 of the supply voltage to turn the IC on. And, pin 6 detects a voltage above 2/3 of the supply voltage to turn the IC off. I’m a student with a slow brain, learning with illustration causes me more understanding.Detailed Description. This engine expansion plug is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance. Direct replacement - this engine expansion plug matches the fit and function of the factory part on specified years, makes and models. We would like to show you a description here but the site won’t allow us. 555 Duty Cycle Control. Jim Keith. 10.20.2012. Here is a simple oscillator circuit that varies the duty cycle over a wide range without affecting the frequency. It is a variation of the simple 555 astable oscillator. Initially, I told a reader that there was no standard 555 circuit that could do this, but then the grey matter started working.CÔNG TY CỔ PHẦN XÂY DỰNG VÀ THƯƠNG MẠI DỊCH VỤ 555 ⭐ tra cứu mã số thuế 3001937697 - Số nhà 147, Khối phố Hòa Linh, Phường Thạch Linh, Thành phố Hà Tĩnh, Tỉnh Hà Tĩnh, Việt NamThe product contains a hard or sharp foreign object that measures 7 mm to 25 mm, in length. and. b. The product is ready-to-eat, or according to instructions or other guidance or requirements, it ...555 Timer IC. IC 555 timer IC is one of the most popular integrated circuit chip used for a variety of applications such as astable, monostable, bistable multivibrators, timer circuits, oscillators, PWM (Pulse Width Modulation), PPM (Pulse Position Modulation), square wave generator or pulse generator, etc. Astable mode, Monostable mode and …555 Timer Pinout. This pin connects to the negative side of the battery. When this pin goes low (less than one-third of VCC), the output goes high. The output voltage from the chip is around 1.5 V lower than VCC when high and around 0 V when low. A 555 timer can give out only 100 to 200 mA in total.For full functionality of this site it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser.C (pronounced / ˈ s iː / – like the letter c) is a general-purpose computer programming language.It was created in the 1970s by Dennis Ritchie, and remains very widely used and influential.By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems, device drivers, and protocol stacks, but its use in …555-Timer is one of the most popular and mostly used ICs. It best suits for timing/timekeeping related circuits.It consists of two operational amplifiers operated in an open loop or comparator mode, RS Latch with additional Reset input, a discharge transistor, an inverting buffer and an amplifier in the output stage. It has a voltage divider circuit with …Nov 17, 2014 · $5+55+555+5555+55555+\cdots n$ terms, Sum of finite seqence of this pattern can be obtained by re-arranging this into geometric sequence. $5$ should be taken common first, we get $$5× (1+11+111+1111+11111+\cdots n)$$ Test your C# code online with .NET Fiddle code editor.The pulse begins when the LMC555 timer receives a signal at the trigger input that falls below a 1/3 of the voltage supply. The width of the output pulse is determined by the time constant of an RC network. The output pulse ends when the voltage on the capacitor equals 2/3 of the supply voltage. 555-Timer is one of the most popular and mostly used ICs. It best suits for timing/timekeeping related circuits.It consists of two operational amplifiers operated in an open loop or comparator mode, RS Latch with additional Reset input, a discharge transistor, an inverting buffer and an amplifier in the output stage. It has a voltage divider circuit with …5 U.S. Code § 555 - Ancillary matters. This section applies, according to the provisions thereof, except as otherwise provided by this subchapter. A person compelled to appear in person before an agency or representative thereof is entitled to be accompanied, represented, and advised by counsel or, if permitted by the agency, by other ...Jun 18, 2015 · Important Characterstics of 555 Timer IC. NE555 IC is a 8 pin device. The important electrical characteristics of timer are that it should not be operated above 15V, it means the source voltage cannot be higher than 15v. Second, we cannot draw more than 100mA from the chip. The high time ( T 1 T 1) and low time ( T 0 T 0) can be calculated using the formulas below. Note that the period is the sum of the high time and the low time. T 1 = 0.694(R1 + R2)C T 1 = 0.694 ( R 1 + R 2) C. T 0 = 0.694R2C T 0 = 0.694 R 2 C. The mark space ratio is the ratio between the high time and the low time or: Digital counters are needed everywhere in this digital world, and 7 segment display is one the best component to display the numbers. Counters are needed in …Amazon.com: Anker 555 USB-C Hub (8-in-1), with 100W Power Delivery, 4K 60Hz HDMI Port, 10Gbps USB C and 2 A Data Ports, Ethernet microSD SD Card Reader, for MacBook Pro More : ElectronicsElectrical transport studies of transistors fabricated from the monolayer phosphorene molecular superlattice show an on/off current ratio exceeding 10 7, along with excellent mobility and superior ...How to enroll in EFTPS. New enrollments for EFTPS can take up to five business days to process. Enroll at EFTPS or request an enrollment from EFTPS Customer Service: 800-555-4477. 877-333-8292 (Federal Agencies) 800-733-4829 (TDD Hearing-Impaired) 800-244-4829 (Español) Common conversions from Celsius to Fahrenheit. 25°C= 77°F. 30°C= 86°F. 33°C= 91.4°F. 35°C= 95°F. 40°C= 104°F. 180°C= 356°F. ASUS ROG Strix B450-F Gaming AMD Ryzen 2 AM4 DDR4 HDMI DP M.2 USB 3.1 Gen2 ATX Motherboard. Fast memory and storage: Dual-channel DDR4 4400MHz (OC) and NVM Express® RAID supported. Aura Sync RGB: Synchronize LED lighting with a vast portfolio of compatible PC gear. Gaming connectivity: Dual M.2 and USB 3.1 Gen 2 Type-A …The TT-555 is a direct output temperature Sensor used to measure air temperature, especially in fan-coil units etc, and contain either a high quality thermistor, nickel or platinum sensing element. The standard cable length is two metres of 2-core screened cable. Longer lengths can be made to order. --------- Low Smoke Zero Halogen cable is ...LM555 Product details. The LM555/NE555/SA555 is a highly stable controller capable of producing accurate timing pulses. With a monostable operation, the time delay is controlled by one external resistor and one capacitor. With an astable operation, the frequency and duty cycle are accurately controlled by two external resistors and one capacitor.charging only. $59.99. Anker USB C Hub, 555 USB-C Hub (8-in-1), with 100W Power Delivery, 4K 60Hz HDMI Port, 10Gbps USB C and 2 USB A Data Ports, Ethernet Port, microSD and SD Card Reader, for MacBook Pro and More. The Anker Advantage: Join the 65 million+ powered by our leading technology. Massive Expansion: Equipped with a …555 Timer IC Pinout, Circuit, Working, and Datasheet. August 19, 2023. 453568. - Advertisement -. The 555 timer IC is an integral part of electronics projects. Be it a simple project involving a single 8-bit microcontroller and some peripherals or a complex one involving system on chips (SoCs), a 555 timer is involved.The control pin of the 555 Timer is not used but it’s connected to a 100nF capacitor in order to eliminate any external noise from that terminal. The reset, pin number 4, is active low so therefore it is connected to VCC in order to prevent any unwanted reset of the output. The output of the 555 timer can sink or source a current of 200mA to ...The original 555 timer is a bipolar device. The 7555 is an improved 555, made with CMOS. It runs up to 500 kHz (versus 100 kHz for the 555), and its very high input impedances and rail-to-rail output swings can simplify designs. Below, I’ll be referring to the 555 chip even though you may use the 7555 chip in the lab.The product contains a hard or sharp foreign object that measures 7 mm to 25 mm, in length. and. b. The product is ready-to-eat, or according to instructions or other guidance or requirements, it ...Callout. Description. 1. Back button: Returns to the previous screen.. 2. Control panel display: Displays menu options.. 3. Help button: Opens the Help menu for the current operation.. 4. Cancel button: Cancels the current operation.United States. Alexa Fluor 555 is a bright orange dye. Used for stable signal generation in imaging and flow cytometry, Alexa Fluor 555 dye is water soluble and pH-insensitive from pH 4 to pH 10.Common conversions from Celsius to Fahrenheit. 25°C= 77°F. 30°C= 86°F. 33°C= 91.4°F. 35°C= 95°F. 40°C= 104°F. 180°C= 356°F. 555 is a sign of positive changes that are bringing you into greater alignment with your soul purpose, and with greater love, vitality and abundance. The angels are showing you this number not to worry you, or frighten you about the upcoming changes…. But just to help you become aware, so that you can keep your thoughts positively aligned. Explosives, blasting agents, water gels and detonators. Explosive materials include, but are not limited to, all items in the “List of Explosive Materials” provided for in § 555.23. Explosives. Any chemical compound, mixture, or device, the primary or common purpose of which is to function by explosion.Here’s the internal schematics of 555 Timer which consists of 25 transistors, 2 diodes and 15 resistors. Represented with a block diagram it consists of 2 comparators, a flip-flop, a …Sep 5, 2015 · It is a CMOS seven-segment counter IC and can be operated at very low power. It is a decade counter, counts in decimal digits (0-9). It is used to display numbers on seven segment displays and it increment the number by one, when a clock pulse is applied to its PIN 1. Means more the clock pulse rate, faster the numbers change in 7 segment Display. The Polaris 21 chip is produced in a 14nm FinFET process and is the smaller Polaris chip. With a core clock of 855 MHz and 768 shaders, the Radeon Pro 555 offers the same specs as the previous ...Digital counters are needed everywhere in this digital world, and 7 segment display is one the best component to display the numbers. Counters are needed in object/products counters, digital stopwatches, calculators, timers etc. To use the 7 segment with ease, there is a 7 segment driver IC which is IC CD4026, so we are building 7 …Nov 19, 2019 · 1. Update Office and Windows 10. W e suggest that you install the latest updates for Windows 10 because updates often fix this kind of issue. For further information, please check this article: Update Windows 10. The control pin of the 555 Timer is not used but it’s connected to a 100nF capacitor in order to eliminate any external noise from that terminal. The reset, pin number 4, is active low so therefore it is connected to VCC in order to prevent any unwanted reset of the output. The output of the 555 timer can sink or source a current of 200mA to ...Oct 27, 2022 · The all-new 2023 F-Series Super Duty is unrivaled among heavy-duty pickup trucks with the best towing available for every trailer type and maximum available towing of 40,000 pounds*, best-in-class maximum available payload of 8,000 pounds**, and 500 horsepower and 1,200 lb.-ft. of torque*** from the new high-output 6.7-liter Power Stroke V8 diesel Color Preview with white background. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.Shop OEM Volkswagen Part # 11A827555C9B9 (11A 827 555 C9B9, 11A-827-555-C-9B9, 11A827555A9B9, 11A827555C 9B9). Liftgate Trim (Upper). From 02/22/2021. Explosives, blasting agents, water gels and detonators. Explosive materials include, but are not limited to, all items in the “List of Explosive Materials” provided for in § 555.23. Explosives. Any chemical compound, mixture, or device, the primary or common purpose of which is to function by explosion.The above explained sawtooth waveform could be given an opposite shape by generating the waveform in an opposite manner. Here, the waveform voltage first increases suddenly or instantly to the peak value, then falls slowly in a slanting shape until it reaches the zero mark, and then again rises suddenly to the peak value, and this keeps repeating.GENERAL PART DESCRIPTION. The CSS555C is a micropower version of the popular 555 timer IC. It features an operating current under 5μA and a minimum supply voltage of 1.2V, making it ideal for battery-operated applications. A six-decade programmable counter is included to allow generation of long timing delays.5 U.S. Code § 555 - Ancillary matters. This section applies, according to the provisions thereof, except as otherwise provided by this subchapter. A person compelled to appear in person before an agency or representative thereof is entitled to be accompanied, represented, and advised by counsel or, if permitted by the agency, by other ...Okay so I figured out what needed to be done and am writing for the benefit of all who might face a similar issue. What I needed to do was modify my testH264VideoStreamer.cpp and DeviceSource.cpp file such that it directly reads data from the device (in my case it was the custom am1808 board), store it in a buffer and stream it.Jan 2, 2024 · That was the time. The status of UJT Q1 unexpectedly changes to ON. The emitter has a low input impedance and drains a lot of current from the input circuitry as soon as it's turned on. The high time ( T 1 T 1) and low time ( T 0 T 0) can be calculated using the formulas below. Note that the period is the sum of the high time and the low time. T 1 = 0.694(R1 + R2)C T 1 = 0.694 ( R 1 + R 2) C. T 0 = 0.694R2C T 0 = 0.694 R 2 C. The mark space ratio is the ratio between the high time and the low time or: The 555 is a single-chip version of a commonly used circuit called a multivibrator, which is useful in a wide variety of electronic circuits. The 555 timer chipis probably the most popular integrated circuit ever made. You can use the 555 chips for basic timing functions, such as turning a light on for a certain length of time, or you can use ...The Northrop F-5 is a family of supersonic light fighter aircraft initially designed as a privately funded project in the late 1950s by Northrop Corporation. There are two main models, the original F-5A and F-5B Freedom Fighter variants and the extensively updated F-5E and F-5F Tiger II variants. The design team wrapped a small, highly ... Quick and easy Fahrenheit to Celsius conversion. There's a simple rule to convert Fahrenheit to Celsius that should be good enough for general use. Simply take 30 off the Fahrenheit value, and then half that number. Note that this value isn’t perfect, but it might save you having to reach for a calculator (or our site!) Absolute Zero. -459.67°F. IC 555: Thông số, sơ đồ, nguyên lý hoạt động và một số mạch ứng dụng. IC 555 là một trong những dòng sản phẩm của công ty Signetics Corporation. với 2 dòng sản phẩm là …By varying the value of either R or C the 555 astable multivibrator circuit can be made to oscillate at any desired output frequency. But what is the maximum frequency of …Review the specifications for the printer, including technical specifications, supported operating systems, printer dimensions, power usage information, and operating-environment range.The Northrop F-5 is a family of supersonic light fighter aircraft initially designed as a privately funded project in the late 1950s by Northrop Corporation. There are two main models, the original F-5A and F-5B Freedom Fighter variants and the extensively updated F-5E and F-5F Tiger II variants. The design team wrapped a small, highly ...

This electronics video tutorial explains how to create a voltage controlled oscillator using the 555 Timer IC. The control voltage pin or pin 5 is used to c.... 1046

555c851090801330740004f7

Jan 16, 2024 · This number represents change, but it also represents freedom and adventure. If this is a time of transition for you right now, embrace your single-hood and lean into your independence. The angel number 555 could represent a new love interest, but the best way to find them is to go on adventures that light you up. Connect the finisher with the equipment while pressing the lock lever. Place your hand on portion A in the figure and then move the finisher carefully. Page 25 1.TROUBLESHOOTING FOR THE HARDWARE Remove the jammed paper from the drawer. Open the paper source drawer and remove the jammed paper.Jan 5, 2021 · The IC 555 timer is a one type of chip used in different applications like an oscillator, pulse generation, timer. The designing of IC 555 timers can be done by using various electrical and electronic components like transistors, resistors, diodes and a flip flop. The operating range of this IC ranges from 4.5V -15V DC supply. Immunofluorescence analysis of Goat anti-Mouse IgG (H+L) Secondary Antibody Alexa Fluor® 488 conjugate was performed using HeLa cells stained with alpha Tubulin (236-10501) Mouse Monoclonal Antibody (Product # A11126). The cells were fixed with 4% paraformaldehyde for 10 minutes, permeabilized with 0.1% Triton™ X-100 for 10 minutes, blocked ... Fahrenheit. Definition: The Fahrenheit (symbol: °F) is a unit of temperature that was widely used prior to metrication. It is currently defined by two fixed points: the temperature at …Step 3: How It Works. The working voltage of the circuit is between 5V~15V DC. As previously discussed 555 timer generates PWM signals when set up in an astable mode by connecting the pin 2 and 6 together. During each cycle capacitor C3 charges up through both R1 and R2 resistors but discharges itself only through resistor R2 as the other side ...The Eurocopter (now Airbus Helicopters) AS550 Fennec (now H125M) and AS555 Fennec 2 are lightweight, multipurpose military helicopters manufactured by Eurocopter Group (now Airbus Helicopters).Based on the AS350 Ecureuil and AS355 Ecureuil 2 series, they are named after the fennec fox.The armed versions of the AS550 and AS555 can be fitted …IC 555, còn được gọi là NE555 hoặc đơn giản là bộ đếm thời gian 555, là một vi mạch tích hợp phổ biến được sử dụng trong các ứng dụng điện tử. Nó được biết đến với tính đa dụng và rộng rãi sử dụng do tính đơn giản, đáng tin cậy và giá thành thấp.This number represents change, but it also represents freedom and adventure. If this is a time of transition for you right now, embrace your single-hood and lean into your independence. The angel number 555 could represent a new love interest, but the best way to find them is to go on adventures that light you up.The 555 timer can be operated at a wide range of power supplies ranging from 5 V to 18 V. It is available in 3 different packages: 8-pin Metal Can package, 8-pin DIP and 14-pin DIP. Timing can be anywhere from microseconds to hours. It can operate in both astable and monostable modes. High output current.The TT-555 is a direct output temperature Sensor used to measure air temperature, especially in fan-coil units etc, and contain either a high quality thermistor, nickel or platinum sensing element. The standard cable length is two metres of 2-core screened cable. Longer lengths can be made to order. --------- Low Smoke Zero Halogen cable is ...Electrical transport studies of transistors fabricated from the monolayer phosphorene molecular superlattice show an on/off current ratio exceeding 10 7, along with excellent mobility and superior ...The 555 Timer IC is an 8 pin mini Dual-Inline Package (DIP). The pin diagram of a 555 Timer IC is shown in the following figure −. The significance of each pin is self-explanatory from the above diagram. This 555 Timer IC can be operated with a DC supply of +5V to +18V. It is mainly useful for generating non-sinusoidal wave forms like square ...Eric Schlaepfer ( @TubeTimeUS) recently came across the chip above, with a mysterious part number. He tediously sanded through the epoxy package to reveal the die (below) and determined that the chip is a 555 timer. Signetics released the 555 timer in mid-1972 4 and the chip below has a January 1973 date code (7304), so it must be one of the ....

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