DSC04402
View of semi-assembled unit. ICs used: MAX232N x2, 7407, 7404.
The MAX232N chips are TTL to RS-232 level converters, the 7407 was used to drive the LEDs and the 7404 was used to drive all the other chips from the GPS, since it can only drive one TTL sink at a time.
In the upper right is the TinyTrak3, below it is a Trimble ACE 2 GPS, 8 channel, made in 1999, not to be outdone in age, the 7404 was manufactured in 1979.
DSC04402
View of semi-assembled unit. ICs used: MAX232N x2, 7407, 7404.
The MAX232N chips are TTL to RS-232 level converters, the 7407 was used to drive the LEDs and the 7404 was used to drive all the other chips from the GPS, since it can only drive one TTL sink at a time.
In the upper right is the TinyTrak3, below it is a Trimble ACE 2 GPS, 8 channel, made in 1999, not to be outdone in age, the 7404 was manufactured in 1979.