On Thu, 22 Feb 2018 09:24:53 -0500 ew via time-nuts <email@example.com> wrote:
> Attached the schematic of the A9 my file of the picture is to large it is the > integrator. Ah.. this looks significantly different than my 5065 service manual shows. So, I guess you want to build a new board that replaces this? Then i would go for the LTC6240HV with a +/-5V power supply. I agree with Charles that you want to have low noise power supplies, though I think using a much cheaper and easier to solder TPS7A49 together with an TPS7A3001 should be more than enough, considering that the LTC6240HV has a PSRR of >80dB. If you need more than +/-5V range for the EFC, I'd add an LTC2057 or LT6018 as amplifier stage after the integrator, powered from +/-15V. An alternative design would be to use a discrete JFET/MOSFET input stage together with an LT6018. But you'd need to select your FET carefully, as it then would limit your 1/f noise and determine your leakage current. Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ time-nuts mailing list -- firstname.lastname@example.org To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.