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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Oscillator board pictorial layout.

Normally, the leads will be positioned on the opposite side from the lamp —ed. Posted by Steve L.

S Heathkit Sine-square Audio Generator Ig | eBay

If you are not familiar with electronics, do not attempt to repair! Instead, contact your nearest service center! You could suffer a fatal electrical shock! You can login to do that! The overall dimensions of the board are 5. DC current is about 30mA on each rail and the positive rail rises to about 47mA with the square wave converter on.

Thank you, much appreciated. These free programs can be found on this page: Please, do not make a copy of the downloaded manual and do not offer to sell it, just use personally to repair defective appliance! As such, the topside traces are to guide hetahkit hand wiring and the silkscreen was for guidance, rather than application to the board.



Looking for other manual? After doing the layout, he fabricated his own, single- sided PCB and successfully built the working generator. While I find this very surprising, Dick obviously has done a lot of excellent work on this, so I would hardly question his results.

You can write in English language into the forum not only in Hungarian! Shouldn’t matter a great deal though and the 1N34A looks like a good match for the forward spec. Mouser and Digi-key doesn’t seem to carry them. If you want to join us and get repairing help please sign in or sign up by completing a simple electrical test or write your question to the Message board without registration.

Hi Shawn, Those turned out to be interesting questions indeed!

However, his measurement methods, while indirect, certainly make sense. 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. Note that red topside traces are only to guide topside wiring.

Dick heatykit left out C32,46 and R29, though he and Larry think that these last three might be useful.

Modifications: Heathkit IG Audio Generator

August 27, – geathkit Reader Comments Posted by Shawn S. Thank you for bringing this up! However, he reports measured distortion figures under 0. Posted by Shawn S.

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That was needed to use free Eagle to create the board. New range switch with cap board mounted. Shame I don’t have the time or patience to figure out how to mod the file. There is no preview for this item! PCB Created for the Project!


PCB Files for Download. Please proceed at your own risk. Bottom view of the oscillator board wiring. The board is intended for single-sided, DIY fabrication. His write up on it is here. Hearty congratulations on completing the project! Dick has done extensive work on various approaches to enhancing the IG I wish they would indicate that on the “obsolete” page.

While some silkscreen marks may overlap pads, PCB vendors typically mask out the silkscreen over the pads, anyway. The way HP’s excellent circuit just locks right in on the level seems almost magical in comparison. Any help heathkt be appreciated. While those reduced distortion, they increased settling time and reduced stability.

Note that this layout is intended for a single sided board. Good luck to the repair! Any help would be greatly appreciated. It was a pretty easy job and is accurate.

After inspection approve all of them and it will be okay. October 25, – For the square wave generator, the CDB was substituted for the equivalent 74C14B, since the other chip was handy. His project, with the PCB, is shown below. Click on the image at left, to download a small zip file, containing the files package heathjit PCB fabrication.