Basic Solid State Relays
The following are examples of home made solid state relays that could be used to replace mechanical types in many model railroad circuits.
Solid state packs
Now we come to the reason that I used the word "standard' to describe the first type of power pack. Electronic, or solid state, packs are now available. The quest for better low-speed control has brought us to a new era.
The term solid state was introduced in the 1960s to describe electronic devices whose circuits contained neither vacuum tubes nor mechanical devices such as relays, as transistors replaced vacuum tubes in most consumer electronics.
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fixed voltages, troublesome circuit breaker VW: 150W 60Hz 1948-49 looks like ZW ZW: 250W 60Hz 1948-49 four variable controls, two with direction and whistle ZW: 275W 60Hz 1950-66 four variable controls, two with direction and whistle Solid State ...
Diode : A solid state device which allows electric current to 'flow' in one direction only.
Diorama : A small scene with great detail. Can be used to set off your models or to photograph a particular model.
Hall effect sensors are smaller, and solid state, but can require more complex wiring, usually a more powerful magnet, ...
Also note the term SSI (solid state interlocking). In the US, the term Interlocking refers to an area where junctions and signals are under the control of a signal cabin or "Tower".
Make sure to connect your tracks to the DC side of the powerpack, and accessories go on AC. Newer powerpacks are solid state, meaning they use transistors instead of rectifiers to convert the current.
During daylight hours I will turn them off too in order to eliminate another source of heat. The radio and head end of train telemetry device, even though solid state will also generate some heat.
Rewire either the field or the armature through a bridge rectifier as shown in Figure B. Then your series motor will reverse with a change of polarity just like the Atlas turntable or your newest locomotive. Today's solid state rectifiers make the ...
 See also: Switch, Current, Voltage, Train, Operation
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