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Electronic circuits easy to realize and although each circuit comes with some essential information.

Bubblegate Circuits of Domenico Di Mario

Multiple led flasher SCR inverter, Geomagnetic field detector, Sound triggered flash, Seismic detector, Electronic attenuator, Windscreen loop aerial, Ultra low frequency receiver, Single led flasher, Mains frequency meter, 10A car battery charger, Light bulb timer ….

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Here is a current source you can build for resistance measurement. When the current is held constant, you know as per Ohm’s Law the Voltage across Resistor is proportional to Resistance value.

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The speed of data transfer on a wired connection depends on Cable, Connector and the Crimping. Ethernet over Coax (EoC) co-axial cable. Optical and Gigabit Ethernet over Optic Fibers. Copper twisted pair and others are other means of Digital Data Transfer over Ethernet. Wi-Fi and WiMax helps freeing the user from wires. Remember Wired is more secure than Wireless.

Building a RJ-45 Ethernet cable of a specific length 

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FreeMat is a free environment for rapid engineering and scientific prototyping and data processing. It is similar to commercial systems such as MATLAB from Mathworks, and IDL from Research Systems, but is Open Source. FreeMat is available under the GPL license.

FreeMat - Engineering Technical Computing  

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Tutanota Email is a Free and open-source end-to-end encrypted email software. Desktop Clients and Apps are available for most of the OS and devices. 

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The Aggregated news feed combines all the delabs and dapj blogs. delabs and dapj news

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Analog Designers created Spice, Analog Design Professionals are adding their experience in many commercial and free spice EDA tools. When you are creating a new demanding design, a working solution is achieved by combining workbench and simulation work. 

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I hope you can help me with a circuit. Its a voltage sweep circuit that will sweep from 0v to10v in a 45 min time period, I’m using it for an input on a signal generator to control the output frequency.

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This Insulation Testing Reference by AEMC Instruments is a Must Read for all Instrumentation and Electrical Professionals. Even Students and Enthusiasts who want to learn more about Insulation, can find this informative. 

The other reference articles also are of Learning Interest. Insulation Testing is a Part of Power, Energy, Green, Solar Systems as well. It is an Important part of Product Safety. 

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I have a question about your “Long Duration Timer” circuit, del20017 found here ..Long Duration Timer Clock. You have labeled U1 as a 4093.

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The Intersil ICL7106 and ICL7107 are high performance, low power, 31/2 digit A/D converters. Included are seven segment decoders, display drivers, a reference, and a clock. The ICL7106 is designed to interface with a liquid crystal display (LCD) and includes a multiplexed backplane drive; the ICL7107 will directly drive an instrument size light emitting diode (LED) display. ICL7107 DPM and DVM chip from Intersil 

Features

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If output impedance of a point is a high value then connecting another circuit at that point will load it resulting in malfunction or error.

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I would like to improve that circuit of a single digit voltmeter, I want to make it measure voltage from -9 V to +9 V but I don’t have any idea.so would you please give me an idea.

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I’m working on a project which involves battery  Ni-Mh 4×1.2v, 2100mAh], which power-ups the boards. The current consumption is about 150mA.

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This is an old article from Practical Electronics 1979. It shows the input circuits and digital ranging controls too. Using 7107 chip for display it is an excellent project to build even today.

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A product spec and need from my email archive. This indicates how clarity in customer specs can help him get a working solution with less wastage of time and money.

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If you want to build electronic circuits, you need to connect the components of your circuit somehow. If you expect to make your circuit work more than just a few times, you need a solid way of connecting them.

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CARACA is a home automation project based on a net of interconnected programmable circuits suited to perform different tasks like switch on/off appliances, decode commands from Ir remote control units, control thermostats, measure temperature and more.

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Waterfox is a privacy focused browser built for power users who value customization and control over their online experience. 

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This centralized system can control almost all of the lights in my home, a few appliances, the garden irrigation, some window treatments, the Audio/Video system, the security system, and the HVAC (Heating Ventilation and Air Conditioning).

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