Decided that in fairness to the THD, s/n thread the IG should be I modified this IG a long time ago — looks like it’s in need of modding. This same upgrade can be performed on the IG, SG-. 18, and incorporated into your kit by Heathkit, depending on when your particular model was sold. Download HEATHKIT IG SINE-SQUARE AUDIO GENERATOR SM service manual & repair info for electronics experts.

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It would be worthwhile during checkout to disconnect it at transformer end to see if it is adding anything, especially on the high value range resistances.

September 21, – To open downloaded files you need acrobat reader or similar pdf reader program. While some silkscreen marks may overlap pads, PCB vendors typically mask out the silkscreen over the pads, anyway.

S Heathkit Sine-square Audio Generator Ig | eBay

The power supply seems quieter with two 10uF tantalum caps added, across C5 and C6. Heath’s part number for the diode was which is shown as a 1N in the cross reference table at d8apro. Before doing this project, I had gone through previous iterations of “greening” the critter, beginning way back in the seventies with an article from the Audio Amateur. New range switch with cap board mounted. The topside traces shown in the BRD file are only to guide topside jumper installation.


Now when I use it, I recall how it used to waver around the final level and change level across the bands.

It was a pretty easy job and is accurate. Shouldn’t matter a great deal though and the 1N34A looks like a good match for the forward spec. If the pot is used, reduce R51 to 2. However, he reports measured distortion figures under 0.

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Eagle version-6 is required to open the. Hi Shawn, Those turned out to be interesting questions indeed! The diode I actually used which worked well came from Radio Shack more than ten years ago and was an unmarked Germanium, as I recall. In addition, some files are archived, so you need WinZip or WinRar to open that files.

Any help would be appreciated. Oscillator board pictorial layout. Looking for other manual? Lg-5218 Files for Download Click on the image at left, for a high resolution pdf file, showing the silk- screen and topside jumper wires.

Pot R54 1kohm is geathkit, in series with R Posted by Shawn S.

The Heathkit tuning network uses a Oscillator board bottom view. These free programs can be found on this page: Shame I don’t have the time or patience to figure out how to mod the file.

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hheathkit Mouser and Digi-key doesn’t seem to carry them. You could suffer a fatal electrical shock! However, inhis wife Robin graciously allowed Tronola to preserve his website, Moorepagewhere you can find more information.


Thank you, much hdathkit. I wish they would indicate that on the “obsolete” page. I’ve used Osh Park but they won’t do single sided boards.

That was needed to use free Eagle to create the board. September 22, – The overall dimensions of the board are 5. If you want to join us and get repairing help please sign in or sign up by completing haethkit simple electrical test or write your question to the Message board without registration.

Audio Generator IG-5218

Adjust the pot for minimum second harmonic distortion. We would very much like to hear, your results, if you have boards made with the files —ed.

His project, with the PCB, is shown below.

While those reduced distortion, they increased settling time and reduced stability. After inspection approve all of them and it will be okay.

If you wish, you can view the Gerber files using the free application, GC-Prevue. Also, everything shown outside of the terminal reference letters is just extra descriptive info, in a reference layer. As such, the topside traces are to guide topside hand wiring and the silkscreen was for guidance, rather than application to the board.

The board is intended for single-sided, DIY fabrication.