Symposium on Electronics
Model Railroader 1989-02 pg. 150 Scale: (none) Category: "Electronics"
This installment covers a reverse polarity detector, which can be used to indicate reverse polarity situations in a blocked layout, or to drive scale signals.
Symposium on Electronics
Model Railroader 1990-02 pg. 116 Scale: (none) Category: "Electronics"
Includes 12-volt lamp driver circuit, a 12-volt traffic light interface, a night flasher, audio amplifier and noise generator, a pseudo-random-sequence generator, and an oscillator circuit.
Symposium on Electronics
Model Railroader 1990-05 pg. 102 Scale: (none) Category: "Electronics"
This installment covers building repeater relays for throwing many points in complex tracks like double crossovers with one switch, creating a Mars light flasher, using the random-sequence generator from the February issue of this magazine to drive circuits for a telegraph sound module, a realistic flickering fire module, diesel sound, creating random on/off lights for residential homes, and traffic light synchronization.
Symposium on Electronics
Model Railroader 1992-05 pg. 100 Scale: (none) Category: "Electronics"
This month's column covers "snubber diode" (to prevent electronics from being damages by the switching of a relay), and full discussion of the now-extinct LM3909 integrate circuit chip that made building LED flasher trivial. There is also a full discussion of how Transistor-Transistor Logic works (TTL). IC codes are explained as well.