Posted on August 2nd, 2014 1 comment
Dave upgrades his HP/Agilent 53131A frequency counter with an ovenised oscillator module from ebay.
Posted on July 31st, 2014 3 comments
Did you know you can use your frequency counter to detect gravity? You’ve likely done it before and you didn’t even know it!
Dave demonstrates the phenomenon of 2g-tipover on quartz crystal oscillators in an Agilent 53131A frequency counter.
How a rubidium frequency standard works
FE-5680A Rubidium Standard Teardown
Posted on July 29th, 2014 5 comments
Dave looks inside the most popular microcomputer of the 1970′s, the Radio Shack / Tandy TRS-80 Model I
And also a look at the TRS-80 Model 102.
Bonus EMI testing for fun.
Bonus rant on how slow the Tektronix MDO3000 is in RF mode.
Hi-Res Teardown Photos:
Posted on July 24th, 2014 9 comments
Dave shows some techniques on how to build and mount usable PCB based front panels user interfaces with LCD displays and push buttons and capacitive touch buttons onto small cheap extruded aluminium enclosures.
In particular for the µSupply project. This is Part 14 of that series.
The uCalc project gets another look in, and does the Sharp Memory dot matrix LCD.
Posted on July 22nd, 2014 7 comments
Dual voltage source selection circuit
Casio FX-7000G the world’s first graphing scientific calculator, circa 1985.
A 1989 vintage analog ohmeter.
Teardown of a 450W electronic dimming module.