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Reward Candy Dispenser for Personal Computers
A personal computer peripheral, battery powered reward candy dispenser which immediately presents students with a single candy for each problem completed correctly.
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| Number | Title | Issue Date |
| 8058939 | Slope compensation circuit A slope compensation circuit includes an oscillator for generating a first clock signal having a reference frequency, a ramp signal generator for generating a ramp signal having a duty ratio of about 50% or higher based on the first clock signal, and a slope compens... | 11/15/2011 |
| 7388444 | Switching regulator duty cycle control in a fixed frequency operation A clock oscillator system for use in providing the switching regulator duty cycle control in a fixed frequency (no cycle skipping) operation is provided. In one embodiment, the circuit according to the invention uses an analog feedback loop to extend the switch ON t... | 06/17/2008 |
| 7307485 | Capacitance sensor using relaxation oscillators An apparatus that may be used to sense capacitance, as well as other functions. The apparatus includes a comparator circuit with hysteresis, a capacitor, and a current driver. The comparator circuit with hysteresis includes a first input and an output. The capacitor... | 12/11/2007 |
| 7268639 | Pulse width modulation circuit The present invention provides a pulse width modulation (PWM) circuit comprising an PWM control circuit for setting an output signal to low when a logical level of a oscillation signal at a first input terminal changes from low to high, for resetting the output leve... | 09/11/2007 |
| 7199676 | Frequency adjustment circuit A frequency adjustment circuit that maintains a target frequency even when frequency adjustment data of zapping circuit is changed by an external noise is offered. The frequency adjustment circuit includes a reset signal generation circuit, a frequency adjustment da... | 04/03/2007 |
| 7023289 | Programmable oscillator A programmable oscillator comprises a capacitor; a current generator couplable to said capacitor that generates a charging current of said capacitor; further comprising at least one resistance coupled to said capacitor; a comparator coupled to said capacitor for com... | 04/04/2006 |
| 6501342 | Power-conserving external clock for use with a clock-dependent integrated circuit The problem of undesired power consumption in an oscillator during "stop" periods of a device is addressed by providing the oscillator in apparatus external to the device, the apparatus including a current sensor sensing current in a line between the appa... | 12/31/2002 |
| 4620162 | Tunable triangle wave generator with two-phase sinusoidal outputs A continuously tunable function generator comprises a first function generator (10) with a triangle voltage generator including a comparator (24), which controls the commutation of a capacitor (14) from a charging phase to a discharging phase and vice ver... | 10/28/1986 |
| 4038611 | Variable on-and off-time relaxation oscillator A relaxation oscillator comprising three cascaded operational voltage comparators is described. The on-time of the inventive circuit is established in accordance with a variable input element to the first operational comparator. The off-time is establishe... | 07/26/1977 |
| 4035744 | Sawtooth wave oscillator circuit A sawtooth oscillator comprises a differential amplifier and first and second switching transistors driven into opposite conductivity states by the output of the differential amplifier. A charging capacitor is connected between the switching transistors a... | 07/12/1977 |
