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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Audio Generator IG-5218

I looked at the NTE replacement but it’s not a very good characteristic match. Sadly, Dick passed away in The Igg-5218 files package includes:.

For readers who want to fabricate the PCB, Larry provides the following tips edited and augmented:. Note that red topside traces are only to guide topside wiring. However, his measurement methods, while indirect, certainly make sense.

PCB Created for the Project! His write up on it is here. 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.


Pot R54 1kohm is added, in series with R DC current is about 30mA on each rail and the positive rail rises to about 47mA with the square wave converter on.

The PCB layout, as seen in Eagle is at left. We would very much like to hear, your results, if you ig-2518 boards made with the files —ed. The drd file is excellon drill data.

It was a pretty easy job and is accurate.

The way HP’s excellent circuit just locks right in on the level seems almost magical in comparison. You can write in English language into the forum not only in Hungarian!

S Heathkit Sine-square Audio Generator Ig | eBay

There is no preview for this item! Maybe you know the feeling—so many toys, so little time: While those reduced distortion, they increased settling time and reduced stability. The power supply seems quieter with two 10uF tantalum caps added, across C5 and C6. If the pot is used, reduce R51 to 2.

For the square wave generator, the CDB was substituted for the equivalent 74C14B, since the other chip was handy. Mouser and Digi-key doesn’t seem to carry them. Will be happy to help if you have further questions.


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

New range switch with cap board mounted. Is there an exact part number or equivalent for the 74C14B? After doing the layout, he fabricated his own, single- sided PCB and successfully built the working generator.

The Heathkit tuning network uses a However, inhis wife Robin graciously allowed Tronola to preserve his website, Moorepagewhere you can find more information.

Note that this layout is intended for a single sided board. If instead, you wish to generate your own output files from the. Now when I use it, I recall how it used to waver around the final level and change level across the bands.

Thank you for bringing this up! While some silkscreen marks may overlap pads, PCB vendors typically mask out the silkscreen over the pads, anyway. Please proceed at heaathkit own risk. Also some files are djvu so you need djvu viewer to open them.