The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 18, 1985
Filed:
Aug. 19, 1983
Axel Schulz, Bickenbach, DE;
Josef Sochor, Dieburg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
For every playback head (6) on the head wheel (1) a sector (5) of the head wheel disk carries a preamplifier consisting of two amplifier branches operating in phase opposition, each having an input transistor stage of the grounded emitter configuration and an output transistor stage of the grounded collector configuration (sometimes referred to as an emitter follower). Both stages have voltage negative feedback. The outputs of the amplifying branches are respectively connected to opposite ends of a rotary primary coil of a multiple transformer serving to couple the rotating preamplifier circuits to stationary outputs. Blocking capacitors prevent the flow of equalizing currents in the event of any deviations from electrical symmetry. The circuit is usable for playback of recordings in the form of digital signals picked up at a rate of 2 megabits per second.