0

Modernizing a laptop bench power supply @ZakKemble

Zak Kemble posts on Zak’s Electronics Blog:

Many years ago (September 2009) I made a simple bench power supply using an LT1083 7.5A linear regulator with adjustable output voltage designed to be used with a 19.5V 3.42A laptop power supply. It still works fine after years of abuse, but my choice of output power connectors was poor (3 pin headers, the sort used for PC fans), it’s made on strip board and cooling was sometimes a problem, so time for an upgrade!

The old power supply also had a selector jumper for 6 voltage ranges; 3V, 5V, 7V, 9V, 12V and 19V. I think I’ve only ever used the 5V, 12V and 19V ranges, so that’s all the new power supply now has.

The new supply uses modern components while still keeping true to the simplicity of the original supply.

See the post for all the details.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 14,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython 2019!

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Re-evaluating Amazon after its acquisition of Whole Foods

Wearables — It’s not a deal breaker

Electronics — Motor interference

Biohacking — Vitamin-C + Gelatin for Accelerated Recovery

Python for Microcontrollers — Buy One Give One, 81 boards, Blinka on Amazon AWS, and more! #Python #Adafruit #CircuitPython #PythonHardware @circuitpython @micropython @ThePSF @Adafruit

Adafruit IoT Monthly — The S in IoT is for Security, Amazon announces Sidewalk and more!

Microsoft MakeCode — Xenomorph candy bucket and spooky workshops with MakeCode!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.