NEC (UP)C4570C replacement opamp? - Page 1
Forum section: electronics / beginners

author: obiwanjacobi
author_rank: Super Contributor
timestamp: June 05, 2012, 06:48:30 am
content: Hi,I'm trying to fix two dead channels on a Roland M-480 line mixer. The channel board has a couple ofNEC (?) C4570C opampson them.I am looking for a replacement for this opamp because I don't think any of the major suppliers carry it anymore.My google-kungfu is not that good and I could not find any replacement suggestions...PS: If someone has the schematic for the Roland M-480 I would be very interestedThanx,Marc

author: david77
author_rank: Frequent Contributor
timestamp: June 05, 2012, 07:53:01 am
content: I'd suggest the NE5532. I haven't read through the whole datasheet of the NEC device, but on first glance it looks as if the NE5532 should do nicely.

author: T4P
author_rank: Super Contributor
timestamp: June 05, 2012, 11:05:46 am
content: For line mixing a NE5532 will do just fine.

author: obiwanjacobi
author_rank: Super Contributor
timestamp: June 05, 2012, 12:42:56 pm
content: I hope I took the correct value from the sheets...C4570CNE5532Supply Voltage16V15VOutput Current10 mA8-16 mALarge Signal Voltage Gain30-30050-100Slew Rate5-7 V/uS9 V/uSGBW10-15 MHz10 MhzTHD (%)0.002?Channel Separation120 dB110 dBLooks pretty good to meThanx!

author: David Aurora
author_rank: Frequent Contributor
timestamp: June 05, 2012, 01:58:27 pm
content: Still available, I bought some not long ago from RS I think. I'll take a look...Yep, here we go (not the same brand or exact model but surely close enough)-http://australia.rs-online.com/web/c/semiconductors/amplifiers-comparators/op-amp/?searchTerm=4570You can also get these things from manufacturers, I've ordered them from Yamaha Pro Audio's service department before when I wanted to be sure I got the closest match.I think you could whack a bunch of different chips in and get the same result though if necessary, these don't seem to be anything too crucial in mixing boards where I've seen/replaced them

author: obiwanjacobi
author_rank: Super Contributor
timestamp: June 06, 2012, 03:41:27 pm
content: Seems like rs-online only has that stock for Australia.I think I'll order NE5532's.I desoldered some chips from another part of the board and the two dead channels seem to work fine again at the first stage, where the signal was very weak compared to good channels - not in totality because I removed an op-amp from the end of the signal flow on each board. So I think I fixed it, just need 2 replacements for the chips I 'borrowed'.

author: obiwanjacobi
author_rank: Super Contributor
timestamp: June 09, 2012, 07:30:27 am
content: I put in the NE5532's and it works great! I fixed the mixer! It's a good feeling to fix somethingI cleaned all the knobs and removed the finger dirt from the front panel and it looks great!Thanks for the help.Marc

author: David Aurora
author_rank: Frequent Contributor
timestamp: June 09, 2012, 12:00:45 pm
content: Glad to hear it!If you decide later that you want to put the 4570's in give me a yell and maybe I can get them and send them to you.

author: belzrebuth
author_rank: Frequent Contributor
timestamp: July 03, 2018, 09:21:38 am
content: Hi all,I'm trying to repair the same exact mixer and the only replacement in SIP package I've found is the NJM4580L.Would it be suitable as a replacement?Thanks!