A DC-DC converter has a main forward converter stage with a snubber at a source side and a sample and hold circuit at a load side. Feedback is provided by a pulse width modulated controller connected at the load side, which feeds an isolation transformer via a differentiating capacitor. The isolation transformer has its output connected to a pulse regenerator which feeds a driver and a volt-time limiter that connects to a main switch at the source side of the forward converter.

An operator's cab is mounted on the frame of a track-type tractor by mounting means comprising first and second pairs of upstanding posts. A first vibration damping means connects a lower end of each of the first pair of posts to the frame for isolating the posts against vibrations and for permitting the posts to pivot rearwardly upon release of a second vibration damping means, releasably connecting a lower end of each of the second pair of posts to the frame.

A DC amplifier circuit with transformer coupled isolation comprises a DC amplifier, an electronic switching element connected to the output terminal of the DC amplifier, a pulse generator for driving the electronic switching element, a small pulse transformer having a primary winding and secondary winding. To the primary winding of the small transformer pulsating signals from the electronic switching element are applied, and two substantially identical circuits each having a diode and a condense...

Low impurity concentration planar anode regions are formed without a mask in a plurality of cathode regions which are isolated from each other on their lateral edge by an insulating barrier and connected to each other by a low resistivity polycrystalline body. Metal contacts to the anode regions and the common cathode polycrystalline body are coplanar.

An isolated two-wire transmitter includes a regulated d.c. power supply having an astable multivibrator which generates isolated power supplies and input terminals which are connected to a first operational amplifier to thereby control a transistor in order to produce a current proportional to the input voltage. That proportional current controls the output of a current transformer, which chops that current at a rate determined by the multivibrator. The a.c. current from the current transformer ...

The invention is a method of fabricating dielectrically isolated semiconductor regions adapted for the construction of an integrated circuit on an epitaxial wafer wherein the epitaxial wafer has a first layer of monocrystalline n+ type silicon of a predetermined thickness and a second layer of epitaxially deposited n-type silicon which is substantially thinner than the first layer. A layer of silicon dioxide is grown on the back side of the first layer of the wafer and a layer of polycrystalline...

In the representative embodiment of the present invention disclosed herein, a well bore flowmeter is provided with a fluid-driven spinner which is uniquely mounted on the closed end of a hollow shaft that is coaxially disposed over a spindle and rotatably journalled thereon by one or more bearings located in the enclosed annular chamber defined between the shaft and the spindle. To protect the bearings, the chamber is filled with a lubricant and the chamber is communicated with the exterior of t...

Low impurity concentration planar anode regions are formed without a mask in a plurality of cathode regions which are isolated from each other on their lateral edge by an insulating barrier and connected to each other by a low resistivity polycrystalline body. Metal contacts to the anode regions and the common cathode polycrystalline body are coplanar.

A method of fabricating dielectrically isolated integrated circuit devices wherein a highly doped monocrystalline semiconductor wafer of a predetermined conductivity type and a substrate of polycrystalline semiconductor material are separated by an insulating layer of silicon dioxide. A working layer of semiconductor material of the same conductivity type, but of a lower impurity concentration as the monocrystalline semiconductor wafer is expitaxially deposited onto the monocrystalline semicondu...

An electrical connector 1 comprising, a ring 22 and a tab 23 are surrounded by insulation material formed with an annulus 27 and a tube 29, the ring 22 is assembled over a rear shell portion 3 of a shell with the tab 23 and the tube 29 received along a tunnel 20 in a rear shell portion 3, and a front shell portion 4 of the shell is assembled by movement to the rear concentrically between the annulus 27 and the rear shell portion 3.