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Allen wrenches are compact, portable, and lightweight, you can take them with you wherever you need to go. In addition, using them reduces fatigue, increasing your productivity.

Bandpass filters with a bandwidth wider than one octave may not perform as expected. If you require bandwidths greater than one octave you need to cascade a lowpass and a highpass filter.

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Have you ever assembled furniture? Or maybe you spend hours in your garage? Then you definitely used this tool. Some call it a hex key, others - an Allen wrench.

These instruments are essentially L-shaped wrenches with 6 sides. They are used to drive hexagon-shaped recessed holes. Greek "hex" means "six". Hence the name.

With a ball end hex key, the fastener access angle can be varied, there is no need to approach the fastener directly at a 90° angle, which is very convenient.

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Hex keys with a ball end have one undeniable benefit - they are perfect for hard-to reach places, or, for example, if the bolt is located close to the obstruction on one of the sides. In this case, using a ball end hex key is more effective than using a regular hex key. With a ball-shaped end, it is easier to slide your key into the receiving slot. You will save your time, that’s for sure!

However, using a ball end hex key is not the best option when it comes to high-torque applications as you will lose some fastener engagement.

The user selects the basic type, Bandpass or Bandstop, number of poles, 3 DB bandwidth and the I/O impedance. The application generates the parts values for three response shapes: Butterworth, Bessel and 0.1 DB ripple Chebyshev. Two different configurations with schematics are also generated.

Design LC band pass and band stop Filters Type Bandpass Bandstop Poles 6 10 MHZ KHZ HZ Center Frequency MHZ KHZ HZ 3 db bandwidth I/O Impedance in ohms

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Nowadays, there are many hand tools to choose from. But this article is aimed to help you figure out the difference between an Allen wrench and a hex key.

Design LC Filters (V 4.0 June 15, 2018 ) This web based application allows the user to design simple radio frequency filters with inductors and capacitors. These filters are most effective between 50 kHz and 500 mHz. Below 50 kHz active filters are usually more cost effective and above 500 mHz strip lines are generally used.

So, Allen vs hex head? Now you know there’s no difference. On Mega Depot, you can find hex keys that come in an array of sizes (measured by across-flats - the distance between the opposite ends of the flat side). Note that if your Allen wrench is bigger than it should be, the fastener or instrument may be damaged.

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I have received emails from people having issues with the program computing inductor or capacitor values that are zero or very low. This is caused by the user specifying parameters difficult or impossible to achieve with LC filters. You may have problems with center frequencies higher than 250 mhz or bandwidths less than 10% of the center frequency. High frequencies require small value capacitors and inductors. Stray inductance and capacitance in the circuit add to the component values and in extreme cases may even exceed them. Band pass filters with narrow bandwidths require components with high precision and Q. Bandwidths less than 10% of the center frequency can be difficult or even impossible to implement with discrete LC components. Your mileage may vary.

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The tips of a hex screwdriver and an Allen key are the same but the difference lies in the shapes of these tools. Typically, an Allen key is L-shaped and a screwdriver is straight with a handle for more convenience.

An Allen wrench, in its turn, is a separate manual tool. However, both a hex bit and an Allen wrench have the same hexagon shape (if to look at the front side).

This program had some bug fixes done on June 15 2018 to correct bad plots for wide bandpass filters. Please report remaining bugs on my contact page.

Inductor sources: CoilCraft DigiKey Wind your own: Inductor Calculator for hams DIY Audio inductor calculator Multilayer air core inductor calculator Inductor calculator for Windows Use Google to find more.

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Note: These filters are sensitive to stray capacitance and inductance and the Q of the components. Keep in mind that capacitors have series inductance and inductors have parallel capacitance and series resistance which in some cases can be very significant.

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For more than a century, people have been using these instruments, they are affordable and popular among many users the world over, including professional mechanics as well as those who need these tools for home use.

Design LC low pass and high pass Filters Type Lowpass Highpass Poles 3 5 7 9 MHZ KHZ HZ 3 db cutoff frequency I/O Impedance in ohms

It is important to mention that a hex key with a ball end makes point contact with the screw. A hex key with a straight end, in its turn, makes the line contact. Keep that in mind.

Formulas and tables used in this program are from Electronic Filter Design Handbook by Arthur B. Williams. Open source code is here. Design LC low pass and high pass Filters Type Lowpass Highpass Poles 3 5 7 9 MHZ KHZ HZ 3 db cutoff frequency I/O Impedance in ohms The user selects the basic type (Lowpass or Highpass), number of poles, 3 DB cut off frequency and the I/O impedance. The application generates the parts values for three response shapes: Butterworth, Bessel and 0.1 DB ripple Chebyshev. Two different configurations with schematics are generated. The frequency response plots are approximations which assume perfect components and construction. Real world results with not be as good. The Bessel plots are only accurate to 2x the cutoff frequency (1/2 for highpass). Design LC band pass and band stop Filters Type Bandpass Bandstop Poles 6 10 MHZ KHZ HZ Center Frequency MHZ KHZ HZ 3 db bandwidth I/O Impedance in ohms The user selects the basic type, Bandpass or Bandstop, number of poles, 3 DB bandwidth and the I/O impedance. The application generates the parts values for three response shapes: Butterworth, Bessel and 0.1 DB ripple Chebyshev. Two different configurations with schematics are also generated. Note: These filters are sensitive to stray capacitance and inductance and the Q of the components. Keep in mind that capacitors have series inductance and inductors have parallel capacitance and series resistance which in some cases can be very significant. I have received emails from people having issues with the program computing inductor or capacitor values that are zero or very low. This is caused by the user specifying parameters difficult or impossible to achieve with LC filters. You may have problems with center frequencies higher than 250 mhz or bandwidths less than 10% of the center frequency. High frequencies require small value capacitors and inductors. Stray inductance and capacitance in the circuit add to the component values and in extreme cases may even exceed them. Band pass filters with narrow bandwidths require components with high precision and Q. Bandwidths less than 10% of the center frequency can be difficult or even impossible to implement with discrete LC components. Your mileage may vary. Bandpass filters with a bandwidth wider than one octave may not perform as expected. If you require bandwidths greater than one octave you need to cascade a lowpass and a highpass filter. If an LC filter can't do what you need because the frequency is too high I suggest looking at an interdigital bandpass filter. This program had some bug fixes done on June 15 2018 to correct bad plots for wide bandpass filters. Please report remaining bugs on my contact page.

If an LC filter can't do what you need because the frequency is too high I suggest looking at an interdigital bandpass filter.

At the beginning of the 20th century, William G. Allen patented a cold drawing process for making hex socket set screws. Wrenches for turning such screws became widely popular. "Allen" is a registered trademark, however, even wrenches by other manufacturers are sometimes called Allen wrenches.

On our website, there are tools made by various manufacturers, choose the best Allen wrenches that meet your needs. It is possible to buy hex keys separately or in sets.

The user selects the basic type (Lowpass or Highpass), number of poles, 3 DB cut off frequency and the I/O impedance. The application generates the parts values for three response shapes: Butterworth, Bessel and 0.1 DB ripple Chebyshev. Two different configurations with schematics are generated. The frequency response plots are approximations which assume perfect components and construction. Real world results with not be as good. The Bessel plots are only accurate to 2x the cutoff frequency (1/2 for highpass).