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22 Sep 2014

by w2aew @ yoututbe.com

Op amp gain-BW product and slew rate limiting are defined, discussed and demonstrated on the bench. This discussion applies to the majority of general purpose op amps on the market – as most op amps are internally compensated with a single dominant pole. High speed op amps, unconditionally stable op amps, non-unity gain stable op amps, high power opamps, etc. may not follow these characteristics because they are often compensated differently in their design. An LM358N is used for the example circuit. Other popular op amps like the LM741, etc. will behave in a similar way. Sometimes the slew rate limit of a device will be the dominant factor in determining the bandwidth, and other times the gain-bandwidth product will determine the resulting frequency response. The video demonstrates why this happens.

Basics of Op Amp Gain Bandwidth Product and Slew Rate Limit – [Link]

25 Jun 2012

Over on the IVC Wiki, there is a nice writeup on how to create a giant bandwidth meter using a couple Arduinos, an ethernet shield, and some long sections of RGB LED strips. [via]

After discovering how cool RGB LED strips are, I decided to make a bandwidth monitor for the Internet connection at our place. Since there are many users active on the same connection there’s bound to be conflicts where someone is gaming and another is downloading, causing the ping to fluctuate (even with QoS HTB-init set up).

Using RGB LED Strips to Monitor [Link]

22 Jan 2012

Alan (w2aew) has done a great little video about bandwidth factors in scopes. He writes: – [via]

I’m often asked by hams and hobbyists – I want to buy an oscilloscope, what bandwidth scope do I need? I usually answer – buy as much as you can afford, even if you are working on low frequency circuits. This video shows an example of why. Even simple audio circuits might have some hidden evils!

Analog & Digital Oscilloscope Bandwidth Considerations – [Link]

15 Jan 2011

Hijacking power and bandwidth from the mobile phone’s audio interface. Creating a cubic-inch peripheral sensor ecosystem for the mobile phone…

HiJack is a hardware/software platform for creating cubic-inch sensor peripherals for the mobile phone. HiJack devices harvest power and use bandwidth from the mobile phone’s headset interface. The HiJack platform enables a new class of small and cheap phone-centric sensor peripherals that support plug-and-play operation.

Hijacking power and bandwidth from the iPhone’s audio interface – [Link]

16 Nov 2010

This project is a meter that measures your Internet connection bandwidth using an antique gauge. It is based on an old voltmeter and on Arduino board. A perl script is getting the information from a Linux router and send it to Arduino via serial connection emulated by FTDI chip. The Arduino convert it into a pulse width. To drive it full scale it needs about 10V and 150mA and that too much fro Arduino to handle, so it uses a switching amplifier made from transistors.

TorrentMeter – A steampunk bandwidth meter – [Link]





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