You can see a Home Made 4-20 mA Current Source in Action. The AD chip is ICL7107. The Pot is a Bourns 10 Turn. See Instrumentation Circuits. Also See Millivolt Source.
This shows the operation of a thumbwheel switch, which has BCD output. It is used to Preset Values in Digital Instruments. Before Microcontrollers and RAM this was the Input device. Even now in industrial instrument this is a simple input device.
Learn about switches here .. Types of Switches
Electronic Projects
Reference
Edison's Gramophone
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