Everything for Electronics
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Build the Lambda Harp

This article describes the theory, construction, and final project functionality of a musical circular harp that utilizes an off-the-shelf concert organ which provides 160 possible instrument sounds and full MIDI capability. Plus, it looks really neat.

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BUILD A ONE INCH SCOPE

What could be more fun than building a miniature oscilloscope? Not one with an LCD screen, but a scope with a real live cathode ray tube just one inch in diameter. All the parts -- including two 6AU6 vacuum tubes -- will be housed in a 5” x 7” x 2” box.

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BUILD A SOFTPOT RIBBON CONTROLLER FOR ANALOG SYNTHESIZERS

The last few years have seen a massive resurgence in the popularity and availability of voltage-controlled synthesizers. The very simple ribbon controller we’ll construct in this article will be used to control any of the myriad voltage-controlled modulation opportunities provided by the typical voltage-controlled synth.

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Build a Vintage Radio Sweep Alignment Instrument — Part 2

In Part 1 of this series, I covered basic sweep alignment theory and construction/operation of an all-in-one sweep alignment instrument I dubbed the WhippleWay Sweep Alignment Board (or WSAB for short). In Part 2, I’ll describe sweep alignment procedures for AM and FM radios and give an actual example of each.

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Designing a Programmable DC-to-DC Converter

DC-to-DC (DC-DC) converters are a common part of modern electronics. The need for an “odd” voltage can arise for biasing, backlighting, analog components, communications, or — as in the case of the LP130 discussed in the last issue — programming and verification. If your main circuit is powered from +5V and you have a few chips that need 3.3V, a simple linear regulator will suffice. However, linear regulators can only reduce the supplied voltage. Most practical DC-DC converters are a type of switching regulator and in this article, DC-DC converter means a switching type of regulator.

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Build a Simple Isolator for Externally Powered Arduinos

Arduino Unos and Megas are normally powered by five volts through their USB connectors or by connecting 7-12 volts to the power jacks or Vin header pins. However, there is another way. This is a very simple project, but it sure makes programming easier.

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Build a Vintage Radio Sweep Alignment Instrument

The popularity of repairing and restoring tube radios has highlighted the need for a variety of test instruments. After repair or restoration of a radio, the final step is often alignment. For an AM radio, a signal generator and voltmeter will do a good job. But with an FM radio, using a signal generator and voltmeter does not always produce the best results. So, I came up with my own design using a digital signal generator module, Arduino processor, and digital display.

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