#FreePCB via Twitter to 2 random RTs

Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]

Cutting Mylar solder stencils from ExpressPCB and EagleCAD files

Juan Chong has posted a detailed tutorial on  how to cut out solder stencils for both ExpressPCB and EagleCAD designs on a laser cutter: In this post I’ll be going over how to cut out solder stencils for both ExpressPCB and EagleCAD designs on a laser cutter. I recently had a need to create some stencils […]

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. […]

Designing a high voltage power supply for Nixie tube projects

A PCB layout for the switch-mode HV PSU by Jan Rychter: I’ve posted a page describing the design of a HV PSU (High-Voltage Power Supply) that generates up to 220V from a 12V input. In addition to that, it also provides 2*Vout (so, up to 440V, for dekatrons), and two outputs for powering digital logic: 5V […]

The deal with Dirty Cheap Dirty Boards PCBs

This sad FACE FRAME! documents the moment Ian found out Dirty PCBs hit Hacker News, Hack a Day, etc. Here’s the story behind our joke PCB site… A few months ago there were some comments in the forum about various PCB services making ‘crap’ $0.90 boards. Later we posted a picture of our own $0.20 […]

Dirty Circuits PCB routing for open hardware designs

  At Dangerous Prototypes we have a team of amazing PCB designers. We crank out a lot of boards publicly and privately, but even we can’t keep these hungry routing addicts busy all the time. Now we’re lending our routing skills to you for your open hardware project through a new site: Dirty Circuits. If […]

PCBs made using a laser cutter

Joebell wrote this Instructable detailing the process of making a double-sided PCBs with a laser cutter: With a little practice, you can make excellent double-sided PCBs by combining a laser cutter with chemical etching. The basic idea is: the laser cutter blasts away spray painted etch resist, then chemicals eat away the exposed copper. Once the copper […]

DiyouPCB low-cost PCB printer for photoresist

Charlie and Victor from Diyouware write, About a year ago my brother and I engaged on a quixotic project to build from scratch a low-cost PCB printer for photoresist. Finally we did it using a Blue Ray optical pickup (PHR-803T) and his UV laser/electronics to sensitize Dry-film. The optical pickup is used through his own […]

KiCad: CERN’s contribution to Free/Open PCB design

Bearmos writes,  “Looks like more good things are going to be coming to KiCAD, thanks to the folks at CERN. It sounds like they’re committing a programmer full time for one year to the project.” One of the main issues the open hardware community must overcome to reach a maturity level akin to that of […]

Simple component size and silkscreen reference board update

Philip posted an update on his component size and silkscreen reference board we covered previously: After the reference board went over well, I also made a set of smaller boards to show the different soldermask colors.  The boards all have a very similar front with exposed pads, traces and silkscreen both on copper and off copper. […]