Vintage Radio Tuning Mechanism

Posted by barnoid Tue, 28 May 2013 23:40:14 GMT

This is how the tuning works on an early sixties Philips radiogram. As I turn the knob it rotates the black disk which has a spiral groove. The horizontal metal bar has a peg in the groove so it rises as the disk turns. Wires run from the bar to the cores of several inductors so that it pulls them up through the inductor as it raises, changing their inductance and the frequency of the circuit they are connected to.

Humidity and Temperature Sensor

Posted by barnoid Sat, 18 Feb 2012 19:13:47 GMT

Humidity and Temperature Sensor
This is my Honeywell HIH-6130 breakout board populated with components. I tested it and it works perfectly. I only made one, this is a composite photo to show the front and back.
ModelCanon EOS 5D Mark II
Exposure0.005 sec (1/200)
Exposure ProgramProgram AE
ISO Speed200
Date and Time (Original)2012:02:18 18:36:19
Exposure Bias0 EV
FlashOff, Did not fire
Focal Length105 mm
Metering ModeEvaluative
Lens TypeCanon EF 24-105mm f/4L IS
Camera Temperature14 C