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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Click on the image at left, for a high resolution pdf file, showing the silk- screen and topside jumper wires. I hope that using your new IG gives you as much pleasure as using mine has given me. Thank you, much appreciated.

Assembling the cap board.

S120222 Heathkit Sine-square Audio Generator Ig-5218

It originally seemed likely that the higher ratio was responsible for the low distortion performance of the HP oscillator.

October 25, – Let us know how it goes. The write-up is in the form of what I call construction notes, which is brief. If you are not familiar with electronics, do not attempt to repair!


Larry has kindly generated Gerber files to allow PCBs to be fabricated at commercial board vendors. PCB Files for Download. The PCB files package includes:.

Note that it will show errors which are harmlessdue to the fact that informational parts of the layout extend past the Heathkkit zero-reference.

Eagle generates errors if an error check is run on the board. PCB Created for the Project!

Shouldn’t matter a great deal though and the 1N34A looks like a good match for the forward spec. Also, Being a project nut, I have several small footprint toroidal transformers on hand.

They are not suitable for fabricating a topside copper layer on the PCB. This project takes the popular Heathkit IG and audio generator to a whole new level of performance, replacing the main board with a design based-on the HPA. I’d probably add plated through holes with tiny pads to the top layer as well.

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. Also, everything shown outside of the terminal reference letters is just extra descriptive info, in a reference layer.

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This file is downloadable free of iv-5218 Will be happy to help if you have further questions. August 27, – The main concern about the diode is its forward characteristics. September 21, – September 22, – The Heathkit tuning network uses a While those reduced distortion, they increased settling time and reduced stability.


Gerber files for PCB fabrication are provided below. Now when I use it, I recall how it used to waver around the final level and change level across the bands. After doing the heathkkt, he fabricated his own, single- sided PCB and successfully built the working generator.

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Any recommendations for a board fabrication place that will do a run of one single sided board for a reasonable price. After inspection approve all of them and it will be okay. It is a direct replacement, except that the compensation components are left out. Looking for other manual? 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.

Note that red topside traces are only to guide topside wiring.