| 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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