Ian Johnston wrote a post on his blog detailing his bench power supply build: My workshop has a couple of bench power supply’s, one is an old Farnell TOPS 3D 3-rail tracking job, and the other is a 3-rail CSI CSI3005XIII with Constant Current functions. The farnell is all analogue but has no constant current control, it has […]
Category Archives: power supply
A digitally controlled dual tracking power supply — III
Kerry writes: In part 1 of this series of blog postings, I showed my preliminary design of a dual tracking linear power supply. In part 2, I showed the completed design and also the finished power supply circuits. And as promised last time, I have made a couple of videos showing the measurements of a […]
A digitally controlled dual tracking power supply — II
Kerry D. Wong writes: In my previous post, I showed my design of a dual tracking ±30V linear power supply. My goal was to use the transformer (28V+28V, center tapped) from an old Deltron W127G open-frame power supply and build a lab supply that can be digitally adjusted in both constant voltage and constant current […]
A digitally controlled dual tracking power supply I
Kerry D. Wong writes: Power supply is one of those things one can never have too many of. I have quite a few already, and my favorite one so far is the Topward 6603A. This dual 60V/3A tracking power supply satisfies most of my needs. I have since added an automatic fan controller, digital voltage […]
Tektronix PS2521G power supply teardown
Kevtris tears down the Tektronix PS2521G power supply. He produced this post detailing his findings.: Weellll, I needed a good bench power supply, so I finally broke down and bought one. I got a Tektronix PS2521G. This doodad has three isolated outputs. This means that each of the three outputs can be wired in series or parallel with […]
Dynamo powered LED bicycle taillight
Martin uses a dynamo to power his bicycle taillight and wanted to find a way for it to remain lit when the bicycle was not in motion. He sent in this quick hack he used, adding a supercap in the taillight circuit, which powers the light without the need for batteries. Via the contact form.
PICkit3 external dual power supply (3v3-5V) circuit
Giorgos from PCBheaven wrote a post detailing the build of his PICKIT 3 external dual power supply: First of all, why… Why use such a circuit since the PICkit 3 has a built-in power supply software controlled. There are basically two reasons to build this circuit: First of all, it may happen – The internal PSU […]
Building a small programmable power supply
Alex over at InsideGadgets has written an article detailing the build of his programmable power supply: A small programmable power supply with 4 digit segment display using an ATtiny84 to allow 3 programmable voltages and ability to adjust the voltage higher or lower. Output range is 0.3V to 12.5V.
ATX Bench power supply
Nick Carter blogged about his DIY bench power supply with the ATX breakout board: There are tons of such projects out there on the internet but most involve hacking open the power supply and I didn’t think that was the way to go. I considered getting a cheap ATX adapter from Monoprice and breaking out […]
Dummy electrical Load
Debraj built an electrical dummy load to test his power supply and wrote a post on his site detailing it’s assembly: 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 […]
Power supply deal
ptyper draws our attention to a deal from TigerDirect which promises to deliver a new HEC 350W Power Supply at no cost after coupon and rebate. The deal says it runs until July 31, 2013. (While the initial advertisement says “free shipping today”, that appears to have expired as we were charged “postage and handling”.) […]
DIY Metcal 13.56 MHz RF supply
Chris over at the EEVblog forum designed and built this DIY Metcal 13.56 MHz RF supply: A while ago i came up with my own circuit for that, plus some nifty firmware (which basically is optional). You can see what i have done so far on the EEV-Blog forum here As of recently the whole thing is […]
quietPower, a low noise switch mode power supply
Brian from teho Labs has been working on creating a power supply – the quietPower: quietPower is a power supply under development at teho Labs to provide a low noise bipolar output. This is essential for creating high quality measurement systems. quietPower is still under development, when it is finished full schematic and a parts list […]
Westinghouse L2410NM LCD power supply repair
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 was wrong. Even before I opened it up, I had a pretty good idea of […]
Power efficient, adjustable, light-sensitive switch using an LED
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 configuration to switch at the desired light intensity. You can adjust the circuit in this […]
SMPS with battery backup and NiMH charger using the LM2595
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 was to combine it with this one and make a complete power supply unit with […]
Solar panel charging circuit
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 have a diode in series with the charging circuit to keep the current from going […]
Micro adjustable breadboard power supply
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 in Rohit’s post at Indian Tinker. Via the contact form.
Simple and efficient 12V to 5V convertor
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 well, previously were using a 7805 wich needed heat sinking. There’s apparently no heat coming […]
ArduPower – remote control AC devices over Ethernet
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 handful of discrete components. The AC outlets are controlled based upon Telnet commands and the […]