In this video documentary, I show the Heathkit model IG-18 Sine-Square (wave) Audio Generator, a function generator dating from 1969. This also applies to the later IG-5218, which had the same circuit and case, but with a more modern looking paint scheme and knob style.
In this rare instance, I do not include a 'restoration' or 'repair' section, since the example shown was already restored by the person I bought it from on eBay. All I did was repaint the top and bottom case clamshell halves, as the restorer had painted then off-white and used odd looking screws; I used a more authentic paint color and more original looking screws.
This model is of nostalgic importance to me, as it is one of three pieces of equipment that I had originally built as a teenager, as part of the summer project to build a bunch of Heathkit test equipment items to equip the high school's new electronics lab/classroom, which I was signed up to start attending the following Fall semester. I already have YouTube videos on the other two models, and mention them specifically in this video.
Here is a timeline table of contents:
00:00 History
18:33 About this artifact
21:30 Overview
26:50 Internal views
35:04 Demonstration
46:53 Beauty shot
47:11 Manual
56:52 Schematic & theory of circuit operation
I am working on a new CAD drawn version of the schematic, including extra information on calibration and operation, When complete, it will be published on my fileshare webpage:
http://www.serpentwebsite.com/fileshare.htm