On Tue, Apr 8, 2025 at 04:55 AM, Jules Ryckebusch wrote:
Look at this one:?? One of my reasons for choosing the OPA1642 was idle current. The OPA1633 ?has >10ma which for a phono preamp with external supply is not an issue?
Best Regards,
?
Jules Ryckebusch
?
OPA1633 is a bipolar differential amp with an Optimum Source Impedance of about 800 ohms. hardly suitable for a MM preamp.
You must have confused it with another.
OPA1655/56 are JFET with 2.9nV/sqrtHz IN density.
