While services like OSH Park let you upload your Eagle CAD files directly for PCB manufacture, most other services, especially production runs, require the industry-standard Gerber files. Essentially a set of text files for each part of the board (ex: top copper, bottom silkscreen, bottom solder-mask, etc), generating Gerbers in the right format can be a bit tricky.
This tutorial walks you through this process, with a specific example of sending files to Seeed Studio’s excellent PCB service (no financial stake here – just like their service!). However, you could use these directions for most any fab house.
Special thanks to Luca Dentella’s post that helped me figure out this process.
Continue reading “Exporting Gerber Files From Eagle CAD”
A custom top for this Adafruit enclosure, lasercut from black plastic and etched with the White Noise Boutique logo. This will hold the amplifier, VU meter driver, and inverse-RIAA filter circuits; knobs and audio jacks to be added tomorrow.
I recently bought a cheap VU meter on Amazon, which looks very cool but needs some circuitry to get running. Unlike vintage meters, which can be driven by the audio signal directly, newer (and especially cheap) meters require DC current. A simple circuit, based on this example by Rod Elliott, uses four diodes to convert the AC audio signal into DC, plus a resistor and capacitor to dampen the movement of the needle.
See Rod’s post for lots more technical detail and a more complex driver circuit. Of course, this is pretty lo-fi and not studio-quality equipment… it also didn’t cost $1000.
Continue reading “Simple VU Meter Circuit”
Microscopic photo of an LED flicker candle circuit board. The board is about 0.025 inches across – really tiny! Image and a really huge version via Tim’s Blog.
Boards arrived today from OSH Park!
Control board for a label application machine from 1985, with hex keypad; really nice hand-drawn circuit board.
An array of Games++ badges, soldered and ready for their chips.
A radio case built in in the Manhattan Construction style, using soldered-together PCBs.
Via: Dave Richards
Hand-drawn diagram for an experimental logic chip by Texas Instruments, circa 1976.
Via: Matthew Sontheimer (thanks!)