A sample-and-hold circuit is provided wherein an input signal is fed via a first gate element to one end of a first capacitor whose other end is alternately grounded, the one end of the first capacitor being connected via a second capacitor to a gate (or base) of a source (or emitter) follower transistor to obtain an output from the source (or emitter) of the transistor which is connected via a second gate element to one end of the first capacitor, while the gate (or base) of the transistor is c...

A sample and hold network samples an input data signal at a periodic rate by differentiating the input data signal and multiplying it in an analog multiplier by a strobe signal, whose spectrum extends to at most twice the highest frequency in the data input signal. The output of the multiplier is combined in a differential amplifier with the input data signal to provide an output having a slope which is zero and also equal to the input data signal at times that are integral multiples of the peri...

A hold down device for multi-layered roofs. The hold down device can be modified to afford a water leak detector. A method of using the devices in securing a multi-layered roof is discussed.

A pit dock leveler having a base frame secured to a loading dock pit and a dock platform pivotally connected at one of its ends to the base frame and pivotally connected at its opposite end to a dock platform lip that pivots between a downward hanging position when the dock leveler is not in use and an extended position substantially co-planar with the dock platform when the dock leveler is in use, whereby the dock platform lip spans and compensates for the space and height differentials between...

A digital peak-hold detector for determining the peak value of an input analog voltage to be displayed on a multiple-element display device detects when the value of the input analog voltage exceeds the value of a ramp-like waveform generated from a counter which repetitively counts down from a number equal to the total number of display elements to zero to generate a compare signal. A control circuit strobes the count corresponding to the peak value into a storage register when the value of the...

A frequency agile phase detector includes a digital frequency detector section connected to a hold-sample-hold phase detector section. The digital frequency detector develops control signals related to frequency differences between a reference periodic signal and a variable periodic signal. The control signal determines the amplitude of a voltage signal impressed across a first hold circuit. A sample signal acts to sample and transfer the sample voltage signal from the first to a second hold cir...

A telephone includes a telephone body, a handset and a telephone network line hold mechanism. The telephone body includes a handset cradle on which the handset is placed, a plurality of operation buttons and the like. The telephone is placed in the offhook state when the user lifts the handset from the handset cradle and placed in the on-hook state when the user places the handset on the handset cradle. The telephone network line hold mechanism is energized when the user places the handset on th...

In a differential sample-hold circuit used in a serial-parallel type A/D conversion circuit containing a current-added type D/A converter, a pair of differential analog input voltages Vin1 and Vin2 are supplied to a non-inverting input and an inverting input of a buffer amplifier. An non-inverted output and an inverted output of the buffer amplifier are supplied through a pair of switches to one end of a pair of voltage holding capacitors having their other end connected to ground, respectively,...

A flexible folding bag having a hold-open top to facilitate easy loading of the bag. The hold-open top is formed on the top edge of the bag from a plurality of top flaps connected to top edges of the bag sidewalls. The top flaps are adapted to be folded inwardly by a user to form one or more cuffs within said opening for maintaining the bag in a maximally open position. The cuffs hold the bag open by applying outward pressure on gusseted sidewalls of two opposing width panels and/or by applying ...

A device that sits on a flat surface, such as a table, desk, or counter top and the like to hold reading material such as newspapers, magazines, books, copy to be typed, sheet music, recipe cards, and the like in an upright position to save space on the table, desk, or counter top and to make the reading materials easy to read. This also keeps the hands of the user free for such activities as eating and writing. The device consists of a base piece which has on each end a rectangular notch into w...