This hybrid circuit uses a mixture of transistors, an IC and a relay and is used to automatically open or close a pair of curtains.

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Very interesting disco light effect for your home party! Just see the picture of it!

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The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the schematic of a circuit that will perform the task.

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Read disclamer, please!