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QN1 and QP1 replacements - parts listed in BOM are "obsolete"
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picovolt  
#1 Posted : Tuesday, April 2, 2013 9:20:45 PM(UTC)
picovolt

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Hi All,

The fjpf parts are not available anymore. I have found an fjp5200OTU that looks like it should sub fine, but then the complimentary (fjp1943) is not available—I assume I need to use complimentary pairs. What would the best parts be that are in current production?

Thanks in advance.

Angel

Edited by user Tuesday, April 2, 2013 9:26:42 PM(UTC)  | Reason: Not specified
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Brian Donegan  
#2 Posted : Thursday, April 4, 2013 9:13:50 PM(UTC)
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MJE15034/35 would be a great replacement. Be sure to isolate them from the heatsink, since they are not insulated packages.
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picovolt  
#3 Posted : Thursday, April 4, 2013 9:41:00 PM(UTC)
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Thanks Brian. I'm sure I've got some mica insulators in my parts bin. Whew—can place my Mouser order now!
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picovolt  
#4 Posted : Saturday, April 6, 2013 6:52:16 AM(UTC)
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The 15035 is also out of stock, but at least they're on order. I ran across NTE2666/2667 and also MJE 15032/33. They look about right to me, but I could be overlooking important parameters. Are you familiar with these?

When I compare the 32/33 with the 34/35 you recommended, the main difference may be the gain is a bit lower.

I know the spec sheet on the FJP5200 states "excellent gain linearity for low THD" which of course sounds great, but this may be a feature on all of these, or, heck, it may not even matter.

I found a thread at DIY that mentioned needing to keep the gain above 80, which the 32/33 pair do not (measured at ~70). So, I'm just back ordering the 34/35 pair. The wait will let me get the housing designed...

Edited by user Monday, April 22, 2013 10:09:28 PM(UTC)  | Reason: update to information:
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