3.7V Li-Ion battery charger circuit

From the comments on our earlier standalone Linear Li-Ion battery charger with thermal regulation in ThinSOT app note post, Jan writes: Nice chip, indeed. Unfortunately not easy to find stocked – here I can get it only from Farnell (5 euro + VAT a pop) or Digikey ($3/pc + VAT + import duties). I would rather […]

Digitally controlled bench PSU project update

Yet another update on Bertho’s digitally controlled bench PSU project we covered previously: Did some test-bed assembling today and did a dry-test of the power board. The good news… the power board did not blow up ;-) The aux PSU for +/-12V analog and the 5V logic supply switcher is working as it should. The power […]

Mini high voltage power supply

Victor8o5 posted detailed instructions of how to make this high voltage power supply. He writes: WARNING: Before you start making anything please take a moment and read this: This circuit is intended to be used for educational and experimental purposes (electrostatic experiences, franklin bell experiment, plasma generation, gas ionization, electronic igniter, testing of insulating materials…) this […]

DIY small bench power supply

newtonn2 posted detailed instructions of how to make this DIY small bench power supply that can adjust with precision current or voltage: After making my Mini Adjustable Power Supply I was very happy with it, but I was missing a more accurate control of the voltage and current. So I decided to make this slightly […]

ATX Breakout Board bench-top power supply build

Kevin Rye shared his ATX breakout board bench-top power supply build in the project log forum: It took 3 weeks for my ATX Breakout Board to arrive from Seeed, but I finally got it! I was so excited to finally be able to make a bench-top power supply. I’ve always wanted one, just never got around […]

Digitally controlled bench PSU project update

An update on Bertho’s digitally controlled bench PSU project, we wrote about it previously: Finally some spare time to get the PCBs finished and on order. Lets see how many brainfarts are there to be discovered ;-) Expected delivery in a couple of weeks, so there is some time before I can dive into the lab to […]

DIY 60W adjustable electrical load

A DIY 60W adjustable electrical load project from Electro-Labs: In this project, we are building a useful board which should take place on your bench. It is an adjustable electrical load which can sink up to 5A @ 60W continuously. This board will come to aid when you need to draw an exact amount of current […]

Eddystone EC10 communication receiver restoration and PSU add-in

Dilshan Jayakody writes: Recently I got vintage Eddystone EC10 MK1 communication receiver from friend of mine and it is completely dead when it comes to me. EC10 MK1 is one of Eddystone’s very early solid state communications receivers and it use 10 PNP Germanium transistors. This receiver cover 550 kHz to 30 MHz and come […]

+/-12V dual power supply

A power supply build by Rajkumar of Electronics Lab: This project is a solution to power up most of devices or projects requiring dual (+/-12V) power supply. Symmetric +/-12 VDC power supply has been designed for audio applications, can power up microphone pre-amplifier, audio buffers, audio mixer, distributions amplifier, headphone amplifier, VU meter and few o other […]

Hand powered USB charger from hacked IKEA flashlight

Werner sends this handy hack he found at IKEAHackers. Giovanni Gentile devised this simple hack which mods an IKEA Ljusa hand powered flashlight into a USB charger. “The procedure was simple, it was enough to eliminate some resistors and use a capacitor sufficient to handle the charge given by the Ljusa’s dynamo. I set the […]

Cheap battery-powered micro-controller projects

An article on cheap battery-powered micro-controller projects by Nerd Ralph: Once the higher cost of a 9V battery is factored in (about $1.50), the 9V battery is clearly more expensive than a 3V coin cell. However you may have a cheap source of 9V batteries – smoke detectors. I’ve found my smoke detectors start beeping […]

DIY prototyping board with 3.3V, 5V, 12V and -12V built in power supplies

Electro Labs’ new project the DIY prototyping board with 3.3V, 5V, 12V and -12V built in power supplies: This DIY Prototyping Board is designed to provide all the most used supply voltages that a designer will need during prototyping a circuit. The switching power supplies on the board output 3.3V, 5V, 12V and -12V rated at […]

9V to 48V DC-DC converter

Konstantin Dimitrov over at Electronics Lab writes: This project is a 8-12Vdc to +48Vdc DC-DC converter based on MC34063 switching regulator. It’s a simple project of a DC-DC converter to make a phantom power supply for professional microphones. It can deliver 15-20mA at 48VDC. It ‘s based on MC34063 DC-DC step-up, step-down and boost converter. […]

0-30V laboratory power supply

Hare’s the 0-30V laboratory power supply project by Arief Laksono of Electronics Lab: This project is based on the 0-30 VDC Stabilized Power Supply with Current Control 0.002-3 A and a new PCB layout is introduced here. It’s a stabilized power supply with variable output voltage in the range 0-30Vdc (33Vdc peak) – and variable current 3A and […]