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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September 22, – Good luck to the repair! Eagle version-6 is required to open the. The PCB files package includes: PCB Files for Download. We would very much like to hear, your results, if you have boards made with the files —ed.
Gerber files for PCB fabrication are provided below.
However, those files have not at this point been heeathkit 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.
However, he reports measured heathlit figures under 0. Posted by Steve L. However, inhis wife Robin graciously allowed Tronola to preserve his website, Moorepagewhere you can find more information. The write-up is in the form of what I call construction notes, which is brief. PCB Files for Download Ig-5281 on the image at left, for a high resolution pdf file, showing the silk- screen and topside jumper wires.
For readers who want to fabricate the PCB, Larry provides the following tips edited and augmented:. Normally, the leads will be positioned on the opposite side from the lamp —ed.
Add your comments here For the square wave generator, the CDB was substituted for the equivalent 74C14B, since the other chip was handy.
To open downloaded files you need acrobat reader or similar pdf reader program. Thank you, much appreciated.
Audio Generator IG-5218
Maybe you know the feeling—so many toys, so little time: What would be the ballpark specs that would work for this? Note that it will show errors which are harmlessdue to the fact that informational parts of the layout extend past the Eagle zero-reference. If you are not familiar with electronics, do not attempt to repair! It originally seemed likely that the higher ratio was responsible for the low distortion performance of the HP oscillator.
While some silkscreen marks may overlap pads, PCB vendors typically mask out the silkscreen over the pads, anyway. DC current is about 30mA on each rail and the positive rail rises to about 47mA with the square wave converter on.
Mouser and Digi-key doesn’t seem to carry them. Oscillator board bottom view. If you wish, you can view the Gerber files using the free application, GC-Prevue.
S Heathkit Sine-square Audio Generator Ig | eBay
Any help would heaghkit appreciated. Dick has done extensive work on various approaches to enhancing the IG October 25, – Sadly, Dick passed away in I’d probably add plated through holes with tiny pads to the top layer as well.
Is there an exact part number or equivalent for the 74C14B?
While I find this very surprising, Dick obviously has done a lot of excellent work on this, so I would hardly question his results.
I looked at the NTE replacement but it’s heathjit a very good characteristic match. It was a pretty easy job and is accurate. Note that this layout is intended for a single sided board. The drd file is excellon drill data. As such, the topside traces are to guide topside hand wiring and the silkscreen was for guidance, heatthkit than application to the board. Also, Being a project nut, I have several small footprint toroidal transformers on hand.
Please proceed at your own risk. In addition, some files are archived, so you need WinZip or WinRar to open that files. The board is intended for single-sided, DIY ig-2518. The PCB layout, as seen in Eagle is at left. I’ve used Osh Park but they won’t do single sided boards.
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. I must say that the distortion figures seem heatthkit too good to be true under 0.
August 27, –