Hardware on Raven Attic Studio

Side tables

Fri, 15 Jan 2021 15:16:26 +0100

1. American cherry boards

2. Wood cut list

3. Thicknessing the boards

4. Ripping the legs

5. Using a jig to cut the legs to length

6. Unshaped legs, cut to length

7. Shaping the legs with a round-over cutter on the router table

8. Shapely legs

9. Routing the leg mortises

10. Tidying the mortises

11. Cutting the side tenons

Frequency response of Cry Baby wah-wah pedal

Sat, 20 Jun 2020 15:05:16 +0100

The frequency response tester is used to measure the response of a Dunlop Cry Baby wah-wah pedal, model GCB 95. The response was measured in three positions, heel-down, toe-down and approximately in the middle. The data from the three results files was combined and plotted in LibreOffice Calc.

A DIY reflow oven

Sun, 14 Jun 2020 14:46:23 +0100

A Raspberry Pi with an Adafruit MAX31855 thermocouple interface board and a solid-state relay is used to control the temperature profile in an oven for reflow surface-mount soldering. The software running on the Raspberry Pi is here: https://github.com/apollo-ng/picoReflow. The instructions in the README.md file in the picoReflow project are good, with one modification needed: to auto-start on power-up, the reflow script in lib/init needs “#! /bin/sh” on the first line of the file, not line 12 as given.

An audio frequency response tester

Sun, 31 May 2020 14:46:23 +0100

Using the Digilent Analog Discovery 2 to automatically test audio frequency response

An Analog Discovery 2 (AD2) signal generator is configured to generate a sine wave through a range of frequencies. The sine wave is fed into the Unit Under Test (UUT) and an AD2 oscilloscope channel is used to sample the UUT’s output. A Python script automates the whole thing and produces a .csv file and graphical plot of the results. Python script details are here.