LT3095 – Dual-Channel Low Noise Bias Generators

Features Generates Two Independent Low Noise Bias Supplies Boost Regulator: Wide Input Voltage Range: 3V to 20V Adjustable Switching Frequency: 450kHz to 2MHz Synchronizable to External Clock 950mA Power Switches Integrated Schottky Diodes Internal Frequency Compensation Linear Regulator: Wide Output Voltage Range: 1V to 20V SET Pin Reference Current: 50μA Low Noise: 4μVRMS (10Hz to 100kHz) High Frequency P ...

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Simple Infrared Barrier

Although infrared communication might look like the technology of the 1990s, it is still present in a multitude of applications around us. Every time you press the button of a remote control, it is most likely it is using the IR (infrared) technology for transmitting data. The TV remote is the most common example. Air conditioning remote controls are another good one. 1. Introduction Although a remote contr ...

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Simplify yourself a mechanical design of a device

Success and reliability of a device depends not only on laboratory tests in “ideal conditions” but also on its mechanical construction. Elimination of mutual influence (EMC), optimal space usage, resistance to vibrations, easy assembly at production are one of factors why it´s worth to design mechanical part of a device into details. At production of prototypes or small series it may be not that important h ...

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Build an op amp with three discrete transistors

You can use three discrete transistors to build an operational amplifier with an open-loop gain greater than 1 million (Figure 1). You bias the output at approximately one-half the supply voltage using the combined voltage drops across zener diode D1, the emitter-base voltage of input transistor Q1, and the 1V drop across 1-MΩ feedback resistor R2. Resistor R3 and capacitor C1 form a compensation network th ...

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Projects from Boldport Club Arrived

This week the beautiful projects from Boldport club arrived. Each of them comes with a nice box or bag which matches the individual project. All electronic components to assemble and solder the project are included, but you need some external power supply and jumper cables to bring some of the projects to life. In the following sections, I will show you some impressions of the assembled kits. My soldering s ...

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LT8330 – Low IQ Boost/SEPIC/Inverting Converter with 1A, 60V Switch

Features 3V to 40V Input Voltage Range Ultralow Quiescent Current and Low Ripple Burst Mode® Operation: IQ = 6μA 1A, 60V Power Switch Positive or Negative Output Voltage Programming with a Single Feedback Pin Fixed 2MHz Switching Frequency Accurate 1.6V EN/UVLO Pin Threshold Internal Compensation and Soft-Start Low Profile (1mm) ThinSOT™ Package Low Profile (0.75mm) 8-Lead (3mm × 2mm) DFN Package Descriptio ...

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Measure small currents without adding resistive insertion loss

In most cases, you measure current by converting it into a proportional voltage and then measuring the voltage. Figure 1 shows two typical methods of making the conversion. In one method, you insert a probing resistor, RP, in series with the current path and use differential amplifier IC1 to measure the resulting voltage drop (Figure 1a). A second method is a widely known operational amplifier current-to-vo ...

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A Connected Lamp to Wake Me Up

So for some reason I bought 2 IKEA lamps at a flea market. As IKEA furniture has a long history of being hacker-friendly, I figured they shouldn't be an exception to the rule. My plan? Fit a few 10W RGB LEDs in there together with an ESP8266 to use the final result as an alarm clock.When you are dealing with a LED consuming that much current, you can't simply use a series resistor as the latter would need t ...

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Fake TV Security Light

Update: Looks like somebody had this idea before me and made a product out of it. Just Google Fake TV. In fact, you can also buy a clone of this from AliExpress – again, just search for ‘fake tv’ in AliExpress. The Chinese versions can be had for about $12 in your hand and that includes a power supply (no doubt of somewhat dubious quality and safety standards). So what follows is a fun project, but it’s eas ...

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Electro Bob

Sitting for long periods has become more common in today’s jobs causing serious health issues. Unfortunately the plethora of activity trackers fail to address the issue: being rather active while sitting does not provide a good picture of the amount of time spent sitting. Sit.Up is a simple device that attaches to the chair and alerts the user by vibration if sitting for too long while also tracking the sit ...

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ESP8266 touchscreen WiFi light controller and clock

A couple of months ago I picked up cheap WiFi-controlled LED bulbs (one among dozens of very similar devices), after seeing them at a friend’s place.  This turned out to be an excuse to play with the ESP8266, which has inspired several hacks. I was overall very happy with these bulbs: decent Android and iOS apps and, compared to fancier solutions (e.g., Philips Hue or Belkin WeMo), they do not require any p ...

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Voltage indicator transitions between colours

This Design Idea gives two versions of an indicator light that changes from green to red as a battery discharges. There are many circuits that do this sort of thing, but all the ones I have seen are too complex and costly for my taste. This DI shows a method that uses an absolute minimum of low cost parts: a dual-color LED and four other parts. Figure 1 shows the simplest version. With 9V on B+ only the gre ...

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