Recently, I purchased a power supply that claimed a max current of 2A and 0~15V. So I wanted to test it. I had a 36 watts bulb (used in motor cycles), but that was too much. Then, I thought of the dummy load that is explained by Dave in his video blog. My version is […]
Dummy electrical Load Read More »
Lithium-ion batteries are sensitive to bad treatment. Fire, explosions, and other hazardous condition may occur when you charge the cell below the margin that the manufacturer defines. Modern battery chargers can manage the hazardous conditions and deny operation when illegal situations occur. This fact doesn’t mean, however, that all cells are bad. In most cases,
Simple circuit indicates health of lithium-ion batteries Read More »
This Instructable is about dry film solder mask, in other words, is the green stuff that is on top of the circuit board. I like to use smd components in my circuits board because I don’t have a computerized drill machine and do in it by hand for a big boards are really tedious. Soldering
Dry Film Solder Mask Read More »
Aurora 48 is capable of individually controlling 48 Full color LEDs using a 40 pin microcontroller. The principle of operation is based on my other “Aurora”s. (see Aurora 9×18) The circuit is relatively simple and straightforward. If you’ve seen other LED matrix type circuit, this should look familier. In a nutshell, the 48 RGB LEDs are divided in two
Aurora 48 – 48 RGB LED Sequencer Read More »
A circuit that properly charges sealed lead-acid batteries ensures long, trouble-free service. Fig 1 is one such circuit; it provides the correct temperature-compensated charge voltage for batteries having from one to as many as 12 cells, regardless of the number of cells being charged. The Fig 1 circuit furnishes an initial charging voltage of 2.5V
Charger extends lead-acid-battery life Read More »
Suppose that you need to test a 1.5V, AA-size alkaline battery. You can apply a short circuit and measure current, or you can measure open-circuit voltage, but neither method properly tests the battery. A suitable test current of approximately 250 mA gives you a more reasonable test. You can use a 6Ω resistive load at
Circuit provides constant-current load for testing batteries Read More »
I was in need of a function generator to produce audio signals for testing effects / amplifiers; as well as TTL clock signals for digital circuits. As function generators generally cost about £200 new, I decided that I would instead build one myself. This project uses the XR-2206 integrated circuit to generate the waveform. It
Analogue Function Generator Read More »
Introduction: A voltage step-up is a circuit that increases the voltage. It can be AC/AC, AC/DC, DC/AC or DC/DC. This voltage step-up is a DC/DC adjustable voltage regulator. Usually a voltage regulator is fed by a higher input than output voltage, for example 9V IN to 5V OUT. This circuit will take a low voltage
Adjustable Voltage Step-up (0.7-5.5V to 2.7-5.5V) Read More »
I have spent a lot of time over the years prototyping electronic circuits and the amount of resistors that have ended up in the trash because they are so cheap you don’t bother to keep them tidy or organised once you take them out of their organised storage – you know the story. One potential
Decade resistor box with jumpers Read More »
The following is a white paper by Silicon Labs with an innovative new process and technology that I believe deserves some level of detail and explanation for informative and educational purposes for EDN readers. Learning about this technology will help all designers give birth to new ideas and architectures as well as help those other
Product focus: CMEMS oscillator architecture Read More »
