Abstract: The disclosed film speed control system for high speed motion picture cameras includes an actual film speed signal source, a selected film speed signal source, a charge pump integrated circuit responsive to the actual film speed signal to produce an output signal linearly related to the actual film speed signal, and a comparing circuit for comparing the charge pump output signal with the selected film speed signal.

Abstract: The apparatus includes a transducer carrying frame having a spine and arms extending from the spine. A transducer is mounted at the foot of the spine and two sled bearings are mounted at the outer ends of the arms, to form a sled assembly which can slide over the recording surface of a magnetic recording disc with the contact face of the transducer and the bearing faces of the sled bearings contacting the recording surface. The sled assembly is attached to the outer, non-supported end of a cantilever leaf spring. When this cantilever leaf spring is undeflected it holds the sled assembly near the recording surface of the recording disc but out of contact with it. A presser foot is provided to press upon the sled assembly and thus deflect the first cantilever leaf spring and bring the sled assembly into recording and reproducing contact with the recording surface of the recording disc. The presser foot is mounted on a second cantilever leaf spring.