pm6666_10mhz

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README

10MHz OCXO for Philips/Fluke PM6666 counter

Alternative 10MHz oscillator for Philips/Fluke PM6665 and PM6666 frequency counters.

Schematic

Created with KiCAD ver. 7.0.11

Design ideas

fuse/PTCC
Vref with trim-pot for fine tune (Vc xtal: 0-4V)
DC-DC conv (12V-to-5V)
LCD-backlight power & trim-pot
jumper to choose always-on or power-switch
SMA and Vref test-point
4 mount holes for alternative use
status LED after fuse/DC-DC conv.

temp.sensor under/near OCXO (LM35/DS18b20)
Window-comparator with warm/cold LED indicator
filter/circuit to convert square to sine-wave
freq. divider

currently usable OCXO: CTI OSC5A2B02 / NDK ENE3311B

allow multiple footprints to fit other OCXO (ISOtemp/Vectron)

Issues/todo

Pk-Pk voltage from OCXO to high, need 470 load resistor
change diameter hole for OCXO (0.8mm is to narrow)
update/correct footprint thp Elco's (47uF & 100uF)
improv. Vref tuning (20-turn trim-pot?)
add solder-jumper to seperate 10MHz signal (antenne!)
power-on LED at better location
update part marking (pin.1, +, etc)

MHz.kHz.Hz 010.000.000 123.456.789

Possible voltage references

ADR4540 4.096V 2ppm Vin: 4.2 - 15V

LM4140 4.096V 3ppm Vin: 5V

LT1019-5 5.000V 5ppm
LT1021 5.000V 5ppm Vin: >10V
MAX874 4.096V 20ppm Vin: 4.3 - 20V
MAX6070AAUT 4.096V 6ppm Vin: 4.3 - 5.5V
MAX6194A 4.500V 5ppm Vin: 5 - 12.6V

MAX6198A 4.096V 2ppm Vin: 5 - 12.6V

MAX6241 4.096V 5ppm Vin: 8 - 36V
MAX6341 4.096V 2.5ppm Vin: 8 - 36V
MAX6250BESA 5.000V 7ppm
REF5040 4.096V 3ppm Vin: 4.3 - 18V

Comments

10MHz OCXO for Philips/Fluke PM6666 counter

Alternative 10MHz oscillator for Philips/Fluke PM6665 and PM6666 frequency counters.

Design ideas

fuse/PTCC

Vref with trim-pot for fine tune (Vc xtal: 0-4V)

DC-DC conv (12V-to-5V)

LCD-backlight power & trim-pot

jumper to choose always-on or power-switch

SMA and Vref test-point

4 mount holes for alternative use

status LED after fuse/DC-DC conv.

temp.sensor under/near OCXO (LM35/DS18b20)

Window-comparator with warm/cold LED indicator

filter/circuit to convert square to sine-wave

freq. divider

currently usable OCXO: CTI OSC5A2B02 / NDK ENE3311B

allow multiple footprints to fit other OCXO (ISOtemp/Vectron)

Issues/todo

Pk-Pk voltage from OCXO to high, need 470 load resistor

change diameter hole for OCXO (0.8mm is to narrow)

update/correct footprint thp Elco's (47uF & 100uF)

improv. Vref tuning (20-turn trim-pot?)

add solder-jumper to seperate 10MHz signal (antenne!)

power-on LED at better location

update part marking (pin.1, +, etc)

MHz.kHz.Hz 010.000.000 123.456.789

Possible voltage references

ADR4540 4.096V 2ppm Vin: 4.2 - 15V

LM4140 4.096V 3ppm Vin: 5V

LT1019-5 5.000V 5ppm

LT1021 5.000V 5ppm Vin: >10V

MAX874 4.096V 20ppm Vin: 4.3 - 20V

MAX6070AAUT 4.096V 6ppm Vin: 4.3 - 5.5V

MAX6194A 4.500V 5ppm Vin: 5 - 12.6V

MAX6198A 4.096V 2ppm Vin: 5 - 12.6V

MAX6241 4.096V 5ppm Vin: 8 - 36V

MAX6341 4.096V 2.5ppm Vin: 8 - 36V

MAX6250BESA 5.000V 7ppm

REF5040 4.096V 3ppm Vin: 4.3 - 18V

pm6666_10mhz

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10MHz OCXO for Philips/Fluke PM6666 counter

Design ideas

Issues/todo

Possible voltage references

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10MHz OCXO for Philips/Fluke PM6666 counter

Design ideas

Issues/todo

Possible voltage references