Dual +12V/-12V @ 400mA Regulated Linear Power Supply with AC input
https://www.electronics-lab.com/dual-12v-12v-400ma-regulated-linear-power-supply-with-ac-input/
The project presented here is a dual output linear power supply. This power supply provides low ripple low noise DC regulated output. It is a very useful tool to power Audio, Video, OPAMP-based circuits, and projects. The circuit provides regulated +/-12V DC output @ 400mA + 400mA. The project supports AC input supply 230V or […]
12W Dimmer with Soft Start for 12V LEDs
https://www.electronics-lab.com/12w-dimmer-with-soft-start-for-12v-leds/
The circuit presented here is a LED dimmer with a soft-start function. The board can drive a LED up to 12W and the circuit can manage a load up to 1A continuous with 12Vsupply. The circuit is built using SG3525 PWM IC and the IRFR120 MOSFET, SG3525 generates the PWM, and IRFR120 MOSFET drives the […]
12V SLA Lead Acid Battery Charger Using BQ24450
https://www.electronics-lab.com/12v-sla-lead-acid-battery-charger-using-bq24450/
This project has been developed to charge SLA (Lead Acid Batteries). It helps to charge 12V Lead-acid battery up to 12Ah in capacity. The specific current output is possible by altering the current sense resistor. The BQ24450 chip contains all the necessary circuitry to optimally control the charging of valve-regulated lead-acid batteries. The IC controls […]
Building an extremely high powered 1-12V lab power supply on the cheap
https://www.electronics-lab.com/building-extremely-high-powered-1-12v-lab-power-supply-cheap/
Matthew Millman has published a new project: For a number of years now I’ve had a couple of high powered switching power supply units made by Power-One. They’re typically found in I.T. equipment and provide a single output rail of either 12 V or 48 V with a very high current rating. The other cool […]
Create +/-12V Split Rail From A 5V Bias
https://www.electronics-lab.com/create-12v-split-rail-5v-bias/
With digital semiconductor technology driving system power supplies to lower voltages for higher performance and lower system power, sensitive analog sensor circuits face a growing problem. Much of the inherent noise created in the early stages of an analog sensor signal path is independent of the amplifier bias voltage, so using a higher bias voltage […]
Constant-on-time buck-boost regulator converts a positive input to a negative output
https://www.electronics-lab.com/constant-time-buck-boost-regulator-converts-positive-input-negative-output/
This is a LM5010 buck-boost regulator able to convert a positive input ranging from 10-50Vdc to -12V output. by Robert Bell @ www.edn.com Buck regulators find wide application as step-down regulators for converting large positive input voltages into a smaller positive output voltages. Figure 1 shows a simplified buck regulator that operates in continuous-conduction mode—that […]
USB To 12V Boost Converter
https://www.electronics-lab.com/usb-12v-boost-converter/
This project provides 12V output from any USB power source, like PC USB port, USB adapter or power banks. LM2577ADJ boost converter IC is the heart of the project. The IC can handle load up to 800mA, it’s advisable to use only 200mA load on output to be on the safe side. The LM2577 are […]
Open source 12V powerbank
https://www.electronics-lab.com/open-source-12v-powerbank/
A custom 12V powerbank for Cube i7 Stylus from Muxtronics: Why would anyone even try to build a power bank – i.e. an external battery for charging mobile devices – these days? These things are commodity, it’s impossible to compete. Right? Well, that is until you find out that the type of power bank for your […]
Teardown: 12V AC adapters
https://www.electronics-lab.com/teardown-12v-ac-adapters/
Michael Dunn has done three teardowns of the worst 12V adapters and what he found is interesting. Yes! Can you believe it? This board used to be in another adapter housing, or more likely, in an end-product. It seems Chinese manufacturing has sunk to a new low: repackaging used and/or surplus power supplies. On the plus […]