Electronics > Repair
1978 Ivie Electronics IE-30A Spectrum Analyzer and IE-17A Audio Analyzer Repair
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Smoky:
Before I joined EEVblog, I did a repair of an Ivie Electronics IE-30A Spectrum Analyzer in 2018 on AntiqueRadios.com website:

https://antiqueradios.com/forums//viewtopic.php?p=3000319



I fumbled my way through it but found a short that kept one of the frequencies from displaying :-+

Unfortunately, the power supply section faded away soon after even though I replaced the large rechargeable batteries. At first I bought Ni-MH ones but soon realized that I could only use the original Ni-Cad types. I'm not sure if I caused more damage because of it :-//

Well, I packed the spectrum analyzer away for a future repair attempt.

The IE-17A is an Audio Analyzer that bolts to the bottom of the Spectrum Analyzer.

After reading its Users Manual, I found that it can send "snaphots" of graphs from the IE-30A when its connected to an oscilloscope! They even give examples of some. Extremely cool 8)

Anywho, this is one compact little instrument:



Something that I was wondering about was, would it be possible to internally switch from a Ni-Cad charging circuit to a Ni-MH type? They mention that the demand for power is high when attaching the IE-17A. It would be nice to really beef-up the battery capacity.

But, of course, I need to see if this thing can be brought back to life again first.

I will attach all of the individual schematics, user's manuals, and calibration documents.
Smoky:
Just to make it easier, here are the block diagram, power supply, wall wart, and board layout pages...









...and the User's Manual for the IE-17A is also attached as a PDF :-+
Smoky:
It's going to take a little time to get the analyzer back apart and laid-out on a bench.

With parts being much smaller these days and PCB's able to be made cheaply, it would be something to make "new" replaceable boards where/if needed :-+

I have tons of pictures from 6years ago plus I'll be taking more.

The IE-17A seemed to work like it should when it was stored but, at the time, I didn't know it could plot graphs and such so I never tried to hook it up to a scope.
floobydust:
It's quite the piece of kit. I found it in dB Magazine circa 1977 and more. It would've changed the sound industry with portable real-time and ADC as well doing pink noise analysis I think.

Do you have the schematic for the charger board 30P08? I'm a bit leery it seems to use battery temperature for end-of-charge to toggle a relay?
I think you can match the old NiCd performance with NiMh 2,450mAh AA's with a mod to the charging voltage settings.
Smoky:
Oops, Here's another copy with factory notes and a price list. There was also a modification/changes performed on these things early on it appears.
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