The electronic interface, briefly referred to in Chapter 7, will now be discussed in more detail. The role of the electronic or electro-hydraulic interface in the overall control system is indicated in the block diagrams, Fig. 7.2. Its function is to process the low power signal generated by the controller in order to provide a signal compatible with the control element input characteristics. To be able to carry out the above stated function, some ancillary electronic circuit elements may have to be included:
A stabilized DC power supply.
A digitial-analogue converter.