A hold attachment for a single-line telephone to allow the user to replace the handset and resume a call later or at another location. The attachment consists of a non-polarity-sensitive substitution circuit which is connected across the telephone line without regard for line polarity, the circuit including a bridge rectifier, a zener diode, the winding of a holding relay, a light-emitting diode and a manual switch, the contacts of the relay being connected in parallel with the switch. To place ...

A trap including a housing having an inner wall and a first opening and a trigger that is inserted into the first opening. The trigger having an edge contacting the inner wall when the trap is armed.

The invention relates to an interleaved track and hold circuit for tracking and holding a value of a continuous input signal and to provide discrete values thereof, wherein the circuit comprises a first and a second stage. To avoid tones caused by differences in the non-ideal elements when switching through several parallel second stages the circuit according to the invention comprises a single first stage and at least two second stages.

The instant invention discloses a method and system for providing a novel wireless centrex service that untethers subscribers from the immobility associated with traditional desktop telephones. Essentially, the present invention extends the benefits of wireless voice and data services to subscribers having a need to move within a plurality of localities such as business and hospital campuses. In accordance with the invention, a wireless telephone subscriber can use a standard cellular/PCS teleph...

A track and hold circuit includes a MOS transistor switch and a holding capacitor, and a bulk potential of the MOS transistor switch is changed in phase with an input signal in order to reduce harmonic distortions.

A hold down clamp that includes a base member. The hold down clamp further includes a bar pivotally connected to the base member on one end thereof. A handle is pivotally connected to a base member and on an end opposite of the bar. The clamp further includes a link connected to the handle and the bar. The link has a stopper extending from a side thereof. The clamp also includes a holder member connected to an end of the bar.

A peak detector for detecting a peak signal includes an input circuit for inputting an input signal, a differential comparator for comparing the input signal with the peak signal to generate a difference signal, a diverting circuit to divert current between a first current path and a second current path based on the difference signal, and a comparator to accept current from the first current path and not from the second current path and to form the peak signal resulting from the current.

A buffered sample-and-hold circuit includes two sampling capacitors for each analog voltage to be sampled. The two sampling capacitors are initially charged simultaneously to the analog voltage to be sampled. One of such sampling capacitors is thereafter temporarily coupled to the input terminal of a unity gain amplifier to pre-charge such input terminal, and any associated parasitic capacitance, to a voltage very near the actual sampled analog voltage. Following such pre-charge operation, that ...

A peak hold circuit that can operate to follow changes in peak value even if the changes are abrupt. The peak hold circuit (1) of the present invention has current control circuit (31), auxiliary switch element (25), and auxiliary constant current circuit (26). Current control circuit (31) counts the number of reference clock pulses RCK after output signal Vout becomes higher than analog voltage DI. When the number of clock pulses counted reaches a prescribed number or larger, auxiliary switch e...

A video poker machine is provided with an auto hold feature that can be selectively turned on or off by the player. When the player uses the auto hold feature, the player plays against a first pay table which has a first theoretical game return. If the player does not use the auto hold feature, then the player plays against a second pay table with a slighter better theoretical game return than the first pay table.