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Making process of Display unit

Latch register circuit

Category diode matrix

In the improvement this time, I changed the letter of the category, too.

The place which the diode mounts is marked with the red pen.
The diode can be mounted without making a mistake in this way.

Mounting of latch registers and a diode matrix

A latch register board is installed between the control circuit board and the diode matrix board.

Because latch registers were added, a regulator for 5V was modified into the 1A type.The resistors for the LED electric current control are soldered to the lead wire of the LED directly.

This is in the condition that all modifying was complete.