Where To Find ne570n

[Intergalactic Tourister]

Anyone know where to find these other than Hong Kong? Is there any substitute that could be dropped in?

I have an EH pedal that needs one.

Thanks

[cjlectronics]

Steve at Small Bear has some. Click here Results for ICs - Compressors/Expanders

The NE571 is an exact drop in for the 570.

[Intergalactic Tourister]

Ok, thank you.

I've been searching "NE570N" so that may have been why my results weren't great.

[Mark Hammer]

NE is the old Signetics prefix. SA570 and 571 are identical, as is the Coolaudio V571. Purportedly, the 570 is a bit quieter than the 571, although I've never heard anyone say "I replaced the 571 in my XXX with a 570, and man it's so much quieter!"

[Intergalactic Tourister]

Interesting.

If I remember correctly the 570 & 571 have a different voltage range. Perhaps one is just hardier than the other. I don't know. But I think that was an ONN SEMI data sheet or something.

I see Small Bear has NOS NE570 and V571D. I think I'd stick with the NE570 since that is what was originally installed.

[doctor]

Interesting.

If I remember correctly the 570 & 571 have a different voltage range. Perhaps one is just hardier than the other. I don't know. But I think that was an ONN SEMI data sheet or something.

I see Small Bear has NOS NE570 and V571D. I think I'd stick with the NE570 since that is what was originally installed.

NE570 and NE571 basically are the same (see attached datasheets) and
typical noise is equal (20μV).

The only significant factor that should be taken into account is the maximum
operating voltage: 24V for NE570 and 18V for NE571.

In other words, NE571 can be a replacement not for all NE570 applications.

[Intergalactic Tourister]

Thanks.

The voltage range is:
NE571: 6v-18v
NE570: 6v-24v

So the 570 is what I'd stay with.

[Enzo]

Of course that is all moot when powered by a 9v battery.

[Intergalactic Tourister]

Its powered by a transformer.

[J M Fahey]

Any idea of the actual DC voltage in there ?

[Intergalactic Tourister]

At 117VAC, B+ is about 15v. However its not uncommon to get 125VAC here.

As doctor stated above "NE571 can be a replacement [but] not for all NE570 applications." So I'll use NE570... a chip with at least an equal voltage rating as the original.

[J M Fahey]

At 117VAC, B+ is about 15v. However its not uncommon to get 125VAC here.

Don't worry, that would translate into +16V tops, well within ratings for any of them.
Of course, if you get the original ... go for it.
And in any case, somewhat higher voltage is never a problem, specially since Zeners and regulators were invented.
Good luck.