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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To open downloaded files you need acrobat reader or similar pdf reader program. Good luck to the repair!
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The overall i-5218 of the board are 5. Bottom view of the oscillator board wiring. Heqthkit way HP’s excellent circuit just locks right in on the level seems almost magical in comparison. Note that this layout is intended for a single sided board. Any help would be appreciated. Oscillator board pictorial layout.
While I find this very surprising, Dick obviously has done a lot of excellent work on this, so I would hardly question his results. Please proceed at your own risk. Other specifications were not tested but the chips have similar speed ratings.
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However, those files have not at this point been used to make a board. 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 wish they would heathit that on the “obsolete” page. If instead, you wish to generate your own output files from the.
Audio Generator IG-5218
Instead, contact your nearest service center! For readers who want to fabricate the PCB, Larry provides the following tips edited and augmented:.
As such, the topside traces are to guide topside hand wiring and the silkscreen was for guidance, rather than application hsathkit the board. DC current is about 30mA on each it-5218 and the positive rail rises to about 47mA with the square wave converter on. After inspection approve all of them and it will be okay. I hope that using your new IG gives you as much pleasure as using mine has given me. The PCB files package includes: September 22, – PCB Created for the Project!
If you wish, you can view the Gerber files using the free application, GC-Prevue. 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. Posted by Shawn Hezthkit. However, inhis wife Robin graciously allowed Tronola to preserve his website, Moorepagewhere you can find more information. Heath’s part number for the diode was which is shown as a 1N in the cross reference table at d8apro.
August 27, – Dick og-5218 left out C32,46 and R29, though he and Larry think that these last three might be useful.
Gerber files for PCB fabrication are provided below. Do you have a part number for the germanium diode? Ig-528 diode I actually used which worked well came from Radio Shack more than ten years ago and was an unmarked Germanium, as I recall.
Click on the image at left, for a high resolution pdf file, showing the silk- screen and heathki jumper wires. Posted by Steve L. PCB Files for Download. Hearty congratulations on completing the project! Oscillator board bottom view. Sadly, Dick passed away in Hi Jesper, Thank you kindly for your nice message.
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Shouldn’t matter a great deal though and the 1N34A looks like a good match for the forward spec. What would be the ballpark specs that would work heathkkt this?
The topside traces shown in the BRD file are only to guide topside jumper installation. The PCB layout, as heahhkit in Eagle is at left. I looked at the NTE replacement but it’s not a very good characteristic match. Adjust the pot for minimum second harmonic distortion.