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Hi to all !
I'm looking for an old schematic made (I believe) in the 60, 70's
of a 50Hz to 60Hz frequency converter/driver to be used
to drive USA made Hammond organs run motor in Europe countries (220VAC/50Hz)..
This circuit core was a National Semiconductor MM5xxx clock IC (8 pins)
that ran out of a 3.5795Mhz TV crystal and dropped its freq
down to a precise 60Hz, then was amplified with power transistors
in a push-pull type circuit..
I cannot remember the NS driver IC part number.
Can someone help me find this wintage schematic ??
Or at least the National Semi IC part number ??
Thanks !
J-Pierre
I'm looking for an old schematic made (I believe) in the 60, 70's
of a 50Hz to 60Hz frequency converter/driver to be used
to drive USA made Hammond organs run motor in Europe countries (220VAC/50Hz)..
This circuit core was a National Semiconductor MM5xxx clock IC (8 pins)
that ran out of a 3.5795Mhz TV crystal and dropped its freq
down to a precise 60Hz, then was amplified with power transistors
in a push-pull type circuit..
I cannot remember the NS driver IC part number.
Can someone help me find this wintage schematic ??
Or at least the National Semi IC part number ??
Thanks !
J-Pierre