Basic Solid State Relays

Published:2013/6/7 21:35:00 Author:muriel | Keyword: Basic Solid State Relays | From:SeekIC

The following are examples of home made solid state relays that could be used to replace mechanical types in many model railroad circuits. These Relays would be ideal for applications where many relays are needed and the load current requirements are low. Due to their small size a large number of relays could be mounted on a single printed circuit board. The relays are based on a 4N33 Optoisolator package. This device has a Darlington output transistor and as the first figure shows it can be used alone for low power applications of up to 30Ma. The second figure shows a version for higher current loads of up to 250Ma.



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