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Old 28th May 2004, 11:35 PM   #1
AJT is offline AJT  Philippines
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Default Heatkit IG 18 schematics please!

can anyone please send me schematics for this heatkit sine-square wave generator?

i lost the manual when we changed residence! this function gen is pushing years and still functional,

i would like to find out if any upgrades could be done. thanks
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Old 29th May 2004, 03:29 AM   #2
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Here you are J2,

This was a first page find with Google.

I built the IG 1272 (sinewave, push button) that I still use
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Old 29th May 2004, 04:54 AM   #3
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thank you very much....
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Old 18th September 2010, 05:43 AM   #4
richiem is offline richiem  United States
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Tony, see Heathkit Schematic Diagram Archive then scroll down to the SG-5218. The schematics are there. There are only three components that were changed in the SG-5218 from the IG-18 --
C5 from 0.68uF/25V to 100uF/35V
R3 from 4.7k to 56k
R11 from 150 to 130
I think that's it.

Then read Reg Williamson's mods, particularly the meter buffer amp -- that is crucial to best performance. Ignore the mod to make Q3 a darlington pair -- it didn't work and Reg retracted the suggestion. Also do not bypass R11 as he recommends -- that makes HF performance dicey.

Good luck.
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Old 18th September 2010, 04:19 PM   #5
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We also have another active thread on the IG-18:

Heath IG-18 IG-5218
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Old 18th September 2010, 08:18 PM   #6
AJT is offline AJT  Philippines
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thanks a lot richiem....
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