It's based on an Arduino Nano board, available for few Euro, and a little bit of manual work. It emulates as closely as possible the functions of the original part, but it's possible to enable some extended functions (like the direct frequency input for example).
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The Arduino Nano board has been fixed to the base by two copper wires on one side, so to permit to spread the two for testing and changes. Before to put it in the equipment the other side can be fixed too, by two more wires.
I've removed the upper plastic part of the socket to insert the replacement.
Attached there are the schematics and the firmware listing (use the Arduino development system to program the board)
To enable the extended functions keep the “STORE” button pressed when turning on the equipment. To turn them off push the “STORE” button during the turn off of the tuner/receiver
The extended functions are:
- display of year, month name, day and “Philips” when in stand by, plus seconds in bynary code
- set of minutes, day, month and year with increment and decrement (push the “TIME” button to cycle through functions, use “SET”+”MIN” to increment and “SET”+”HOURS” to decrement)
- display of the intermediate frequencies and firmware release (pushing “TIME” more times, they are after the clock and calendar settings)
- direct frequency input using the memory buttons (STORE for 0). Push the current frequency range (FM or MW or LW) and keeping it down press and release “STORE”. Four horizontal lines will appear, then you can type the frequency
- display of the the string “tape” and “Phon” when the Tape A or Pick Up are selected
Enjoy it !
Check out my instagram @1gcarlo to see some photo of my little collection of vintage Philips equipments