Kerry Wong fixed his LCD monitor (Westinghouse L2410NM). He documented the whole process on his blog. My seven year old 24 inch LCD monitor (Westinghouse L2410NM) started to flicker recently, so I decided to take a look inside to see what … Read more
Power efficient, adjustable, light-sensitive switch using an LED: You can use an LED as a photoelectric sensor. A previous Design Idea shows that such a switch is highly power-efficient, consuming almost no power (Reference 1). However, you cannot adjust that … Read more
Giorgos from PCBheaven designed an SMPS buck regulator with 2xAA NiMh battery trickle charger and power failure output: Some time ago I presented a small circuit with the MCP1640, the High Efficiency Battery Boost Regulator using the MCP1640. My original intention … Read more
Solar panel charging circuit: A special circuit is needed when charging a battery from a Solar Panel. When the solar panel is not providing any power the battery might start draining current into the panel. One common solution is to … Read more
Rohit Gupta built this super small size breadboard power supply designed around the LM317 generic adjustable Voltage Regulator. It measures just 3cm x 2.5cm and fits the breadboard without wasting any holes. You can view the schematic and further details … Read more
Fcobcn shared his simple and efficient 12V to 5v converter. It’s based around the TL2575 buck IC, and can output 1 amp of current. I’m using a TL2575 from ti, wich has a max efficiency of 88%, 1A, works quite … Read more
Alberto Panu has designed this Arduino-based project to remotely control a bank of AC household current outlets through an Ethernet network. The project uses an Arduino Uno, Ethernet shield, ULN2003 Darlington transistor array along with six power relays and a … Read more
Dolabra put together this 5 volt solar power supply. The solar panel recharges a single alkaline battery which is then boosted to 5volts via an NCP1402 breakout board. Maximum output is 200 mA. I broke all the rules — I … Read more
Dilshan designed an offline high voltage AC power supply primarily for SMPS testing. It outputs a square wave, so hooking it up to a mains-transformer based linear supplies is not a good idea, as the transformer will overheat. It’s open … Read more
The ATX breakout board bench power supply is back in stock at Seeed Studio. This board recycles an old computer PSU into a handy bench tool with 3.3/5/12/-12 volt supplies. You can get one for $14 at Seeed Studio.
Software & Sawdust posted his new Benchtop power supply based on the ATX Breakout board. It features our breakout board, and an ATX power supply packed together into a custom wood case. This is a project that’s been in the … Read more
How to use a digital potentiometer to calibrate and control an adjustable power supply. A resistive feedback network is often used to set the output voltage of a power supply, since fixed resistors are simple to use and low cost. … Read more
Squonk writes about this scalable solar charger he’s located: An unconventional, scalable high efficiency 12V solar power system and battery charge controller with low voltage cutout to protect the battery. (ideal for systems of 50W or less). The most common … Read more
If you design circuits powered by CR2032 batteries here’s an article located by Joe Desbonnet which you should consider: This is an interesting article on how the performance of a cell/battery under pulsed loads can vary dramatically depending on period, … Read more
Tautic Electronics has donated five dual output breadboard power supply to the Open 7400 Competition. Get your entry in and this and other cool hardware can be yours.
Another review of ITead’s OverLoad programmable dummy load: All in all, interesting device. The only major flaw I see attm is that instead of using DAC and drive the current value trough mcu they are doing that analogue … I’ll … Read more
Another article that might help with bench power supply designs: A good, reliable and easy to use bench power supply unit is probably the most important and most used device in every electronic lab. A proper electronically stabilized bench power … Read more
tempmj posted his first impressions ITead’s new programmable dummy load. Via the forum.
schazamp built an FSAR001 experimenter board: This device, remember, takes 80-265Vrms wall power and puts out a (relatively) clean 5V DC. According to the datasheet, the way this thing works is by monitoring the voltage of the AC waveform and … Read more
Not everyone understands how multimeters measure RMS voltage. Doug Criner has put a good explanation. Can there be more than one RMS value of a voltage waveform, but only one of them is true? Apparently so.To use simple Ohm’s law … Read more
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