25th-Nov-24, 08:51 PM
A few more technical details:
1/ Optical isolation of the input digital signals is achieved using a Broadcom ACSL6400.
2/ As the ACSL6400 inverts the logic signal, this is followed by a 74HC04 hex inverter IC.
3/ The approach now uses two voltage regulators, one at 12V to drive the displays and one at 5V to drive the onboard logic.
4/ The system itself will be powered by a 1.2A 15V Hornby PSU (borrowed from an ARC AIR powerbase).
5/ The segments are driven by a TPIC6C596 with one IC for each digit.
6/ The plan is to use a combination of white, red and green display modules, and since each colour has a different forward voltage drop (e.g. 11.5V in the case of green segments), this will require different series resistor values for each of the three colours in order to ensure brightness levels are equalised.
So far all is progressing to plan :)
c
1/ Optical isolation of the input digital signals is achieved using a Broadcom ACSL6400.
2/ As the ACSL6400 inverts the logic signal, this is followed by a 74HC04 hex inverter IC.
3/ The approach now uses two voltage regulators, one at 12V to drive the displays and one at 5V to drive the onboard logic.
4/ The system itself will be powered by a 1.2A 15V Hornby PSU (borrowed from an ARC AIR powerbase).
5/ The segments are driven by a TPIC6C596 with one IC for each digit.
6/ The plan is to use a combination of white, red and green display modules, and since each colour has a different forward voltage drop (e.g. 11.5V in the case of green segments), this will require different series resistor values for each of the three colours in order to ensure brightness levels are equalised.
So far all is progressing to plan :)
c
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