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tables, they can be superimposed where necessary. For example, a record of a crowd cheering can be mixed with another of a military band. Together they would provide a realistic accompaniment to a film of a procession. As a matter of fact, much of the sound accompanying a newsreel is often "assembled" in this way.
Although each turntable will have a separate pick-up, it is a good plan to mount one of them so that it can be swung to operate on either turntable. If you are using two separate record players, you will have to place them side by side to do this. Also the turntable plates must be at the same level.
Watch the needle of one pick-up and see whether you can swing it exactly over the centre of its turntable. Probably it will overhang by \ inch or so. Now swing this pick-up over the other turntable and move things about until you get exactly the same overhang there. Provided you can swing it far enough round — it has to turn through nearly half a circle — this pick-up can be used equally well on either turntable. Then, should occasion arise, you can place both pick-ups on one record and make a smooth transition from one part of a record to another part of the same side. Of course you must arrange to use this particular record on the turntable over which both pick-ups can be swung.
Mixing Circuits
Using two pick-ups to feed a single amplifier, you will need some way of deciding which pick-up is going to be heard from the loudspeaker. Switches are not enough. The volume from each pick-up must be controlled smoothly and independently of the other. Nor is it sufficient to provide each pick-up with a volume control and connect the leads directly together. In this case, fading one pick-up right down will short-circuit the other.
You can get over this by putting a resistor in the lead from the centre contact of each volume control. The lead to the amplifier is taken to the other end of each resistor and so it
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