Title :
Transistor circuits for magnetic drum recording
Author_Institution :
Ferranti Electric Limited, Toronto, Canada
Abstract :
Drum recording is accomplished bypassingcurrent through a magnetically soft write head placed in close proximity to a magnetically hard drum surface. Flux from the head resulta in magnetized areas on the drum surface. Drum coatings and heads presently in use require writing currents in the order of 1 ampere. Head impedances are typically 2 to 5 ohms. This means the writing circuit must supply severa! watts of power. The use of the following three basic circuits is outlined: power one-shots, bloc king oscillators, and class B amplifiera.
Keywords :
Counting circuits; Driver circuits; Magnetic circuits; Magnetic recording; Pulse circuits;
Conference_Titel :
Solid-State Circuits Conference. Digest of Technical Papers. 1957 IEEE International
Conference_Location :
Philadelphia, PA, USA
DOI :
10.1109/ISSCC.1957.1183975