The electric potential output from a battery and generator assembly is monitored by three electric indicator circuits, one of which includes a first indicator which is activated to indicate excessively low battery voltage when the normally deactivated transistor switch in said circuit is activated by deactivation of a bias control transistor resulting from deactivation of a zener diode when the output voltage from the assembly drops below a predetermined minimum; a second indicator circuit of wh...

There is disclosed an input/output controller for an information processing system comprising a main memory, a central processing unit, a peripheral controller and a plurality of peripheral units coupled to the central processing unit. In particular, the input/output controller comprises a plurality of physical channels disposed between the peripheral controller and the central processing unit, a plurality of logical channels for transmitting information with the central processing unit, and eac...

An improved gain control circuit for an amplifier having a plurality of parallel connected resistors each having a series switch to selectively switch the resistor into the control circuit to vary the gain incrementally as some continuous function of amplifier input voltage. In one embodiment, the parallel resistors are connected between the amplifier input and output. Alternatively, the parallel resistors may be connected as the amplifier input resistance. A peak follower circuit monitors the a...

A sewing machine incorporates a ferrous member connected to a rotating part of the machine and a magnetic perception head disposed such that during operation of the machine the member moves towards and away from the head. Pulses produced by the head are fed to a counter which gives the total number of pulses and thus an indication of the total operating time of the machine and of the number of stitches made.

A variable output function double bias potentiometer having first and second low resistance zones to provide two bias voltages and a high resistance zone with which output means are in contact to provide an output function which can be freely varied between the two bias voltages.

In transistor output stages, where the applied voltage exceeds the voltage rating of available transistors, stacking is employed to divide the voltage across two or more series connected devices. A complementary emitter follower transistor is employed in the biasing of the stacking transistor along with a current source acting as the emitter follower load. This arrangement provides constant current drive for the stacking transistor without resorting to low value biasing resistors which produce e...

An output device capable of automatically producing a balanced output format comprises a unit for measuring a width of a recording medium, a unit for determining an output format such as a character pitch and margin values based on the width of the recording medium and the number of characters per line to be recorded on the recording medium, and a recording unit which outputs characters in accordance with the determined output format.

A power source with a sparkproof output, comprising a transformer with a rectifier, a spark proofing unit for limiting electric energy released as a result of commutation of the output circuit of the power source, which incorporates an inductive element, made in the present embodiment in the form of a choke, and thyristors and is connected to the output of the rectifier, characterized, in accordance with the invention, in that it is provided with an automatic reclosing unit designed to restore t...

This application describes an amplifier comprising two active stages having mutually inverse input and output impedances whose magnitudes are at least an order of magnitude greater or less than the impedances of the external circuits to which the amplifier is connected. At the input end, the signal source is coupled directly, or by means of a transformer, to the high input impedance active element, and through a matching series impedance to the low input impedance active element. Similarly, the ...

There is disclosed an implantable pacer, the characteristics of whose output pulses change automatically after the pacer has generated a predetermined number of pulses. The pacer includes a charge-dependent resistor whose impedance increases in accordance with the total current flow through it. After a predetermined number of pulses have been generated, the impedance increases relatively abruptly. The increase in impedance controls a decrease in the amplitude and/or decrease in the width of subs...