Abstract :
The paper describes the various circuits associated with a coincident-current ferrite store, all of which use transistors and no valves. A switched-current pulse generator supplies the drive pulses to the store and makes use of the high-frequency power transistor type OC23. Selection is done economically by using gating matrices controlled by transistors. Junction diodes type OA10, or gold-bonded point-contact diodes type OA5, pass the current pulses in the matrices with a very small voltage drop. Two methods of gate selection and drive are described, one of which makes use of square-hysteresis-loop cores to select and drive the gating transistors, and the other uses a diode matrix to provide potential levels at the bases of the gating transistors. The output of the store is amplified by high-frequency transistors, strobed, and standardized. Provision is made for writing new information, or for rewriting information immediately it has been read, by a diode logical network controlling the `inhibit¿ pulse generator.
