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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October 25, – 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. It is a direct replacement, except that the compensation components are left out. The heathkkit is intended for single-sided, DIY fabrication.
Note that it will show errors which are harmlessdue to the fact that informational parts of the layout extend past the Eagle zero-reference. 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. His project, with the PCB, is shown below. The main concern about the diode is its forward characteristics. Eagle version-6 is required to open the. Gerber files for PCB fabrication are provided below.
It originally seemed likely that the higher ratio was responsible for the low distortion performance of the HP oscillator. For the square wave generator, the CDB was substituted for the equivalent 74C14B, since the other chip was handy.
Modifications: Heathkit IG Audio Generator
They are not suitable for fabricating a topside copper layer on the PCB. There is no preview for this item! For readers who want to fabricate the PCB, Larry provides the following tips edited and augmented:.
Hi Jesper, Thank you kindly for your nice message. PCB Files for Download. Dick also left out C32,46 and R29, though he and Larry think that these last three might be useful.
Shame I don’t have the time or patience to figure out how to mod the file. I looked at the NTE replacement but it’s not a very good characteristic match. That’s because the IG meter scale is corrected for the diode effects at low voltage. Mouser and Digi-key doesn’t seem to carry them. I’ve used Osh Park but they won’t do single sided boards. Larry has kindly generated Gerber files to allow PCBs to be fabricated at commercial board vendors. However, inhis wife Robin graciously allowed Tronola to preserve his website, Moorepagewhere you can find more information.
If you wish, you can view the Gerber files using the free application, GC-Prevue. While those reduced distortion, they increased settling time and reduced stability.
S120222 Heathkit Sine-square Audio Generator Ig-5218
Those would be C44,45,48, CR7,8, R27, Eagle generates errors if an error check is run on the board. I’d probably add plated through holes with tiny pads to the top layer as well. You can write in English language into the forum not only in Hungarian! Now when I use it, I recall how it used to waver around the final level and change level across the bands. Also some files are djvu so you need djvu viewer to open them.
The PCB layout, as seen in Eagle is at left. Performance results seem at least as good as the ones we obtained. Do you have a part number for the germanium diode? Maybe you yeathkit the feeling—so many toys, so little time: August 27, – Thank you, much appreciated. Assembling the cap board.
If you are not familiar with electronics, do not attempt to repair! Normally, the leads will be positioned on the opposite side from the lamp —ed.
After inspection approve all of them and it will be okay. To open downloaded files you need acrobat reader or similar pdf reader program.
S Heathkit Sine-square Audio Generator Ig | eBay
That was ig-518 to use free Eagle to create the board. Is there an exact part number or equivalent for the 74C14B? If the pot is used, reduce R51 to 2.
His write up on it is here. We would very much like to hear, your results, if you have boards made with the files —ed. Looking for other manual?