Recent posts

flip-flop/BCF project

Ray over at the diyAudio forum has been working on his flip-flop/BCF project: I’ve just finished a project to roll up the developments into a more ‘finished’ build, feeding the balanced outputs from the flip-flop board into a...
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#FreePCB via Twitter to 2 random RTs

Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every...
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Using “Ultracapacitors” as a power conditioner and ballast for transient high-power loads (or “How to run your HF rig from D-cells” – sort of…)

KA7OEI writes: An advantage of Lead-Acid, NiCd, Lithium Ion and some NiMH cell types is that they have quite low internal resistance compared Alkaline cells: Even an aging lead acid battery that is near the end of its useful life may seem to be...
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Bus Pirate v3.8 free PCB build

Ilias Giechaskiel blogged about his free Bus Pirate v3.8 PCB build.  The Bus Pirate is an open source hacker multi-tool that talks to electronic stuff. The next step was to burn the bootloader onto the Bus Pirate. Though I have found a couple...
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HOW TO: Shenzhen Spring Festival/Chinese New Year

By 2016 most hackers have some idea that China shuts down for a month every year. If not, learn it: from some time in January to some time in February the world’s largest country and manufacturing capital, one of the biggest economies, closes...
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Crystal Ladder filter

Dan Watson writes: Here’s a little board for making a four pole crystal ladder filter. This type of filter has a very high Q and narrow bandwidth, allowing you to select a specific frequency from your signal. Because of the narrow...
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App note: Auto-zero amplifiers ease the design of high-precision circuits

An application note from Texas Instruments on new chopper amplifers superiority over old design chopper amps. Link here (PDF) This article shows that the auto-zero calibration technique is very different from the chopper technique and is one that,...
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Free PCB Sunday: Pick your PCB

We go through a lot of prototype PCBs, and end up with lots of extras that we’ll never use. Every Sunday we give away a few PCBs from one of our past or future projects, or a related prototype. Our PCBs are made through Seeed Studio’s Fusion...
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App note: Transmitting SXGA video signal through 1kft (300m) CAT-5 cable

An app note from Intersil on utilizing CAT-5 cable for SXGA video transimission. Link here (PDF) The goal of this application note is to present the most current design methods for transmitting high bandwidth SXGA video signal over long distances...
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App note: USB Mass storage class on an Embedded Host

Microchip’s application note (PDF!) on USB Embedded Host Mass Storage class: With the introduction of Microchip’s microcontrollers with the USB OTG peripheral, microcontroller applications can easily support USB Embedded Host...
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