Electronic Piano Crossword

This crossword was created by W. Richmond with EclipseCrossword by Green Eclipse Software — http://www.eclipsecrossword.com/

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Across 4. The speed of turing something on and off 5. The last stage of a system that may feed into another system 7. A way of shaping plastics 8. The 'middle' part of our simple system 9. A measuring unit for frequency 11. A component that stores electric charge 12. One part of a system 13. One metal contained within solder 14. A material that doesn't allow electric current to flow 15. An easier way of saying Computer Nemeric Control 16. A type of solvent cement for joining plastics 17. A source of electrons 18. A type of plastic

Down 1. Restricts the flow of electric current 2. A circuit is contained within this component 3. Allows the solder to flow easily and give a good joint 6. A way of joing metals together 7. A simpler way of saying 'Printed Circuit Board' 10. Machine that is good at cutting slots in a horizontal plane 11. A material that allows elctric current to flow