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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 |
| 7218175 | Dynamic feedback linearization An apparatus comprising an amplifier comprising at least one amplifier transistor, a threshold detection network and a bypass capacitor. The amplifier may be configured to generate an output signal at a collector in response to an input signal received at a base. Th... | 05/15/2007 |
| 6809596 | DC offset cancellation circuit, system and method Described are a circuit and system to provide an output signal in response to composite input signal comprising an AC signal component and a DC signal component. An amplifier provides an amplified voltage signal in response to a voltage representative of the composi... | 10/26/2004 |
| 6396934 | Analog audio filter for high frequencies The present invention relates to an active analog filter including a differential amplifier, an output of which provides a filtered signal and a non-inverting input of which is connected to a median potential between supply potentials of the amplifier, a ... | 05/28/2002 |
| 6130582 | Amplifier circuit including compensation circuitry for canceling variations in an amplifier feedback signal An amplifier circuit (14') for canceling variations in an amplifier feedback signal includes compensation circuitry (50) defining a replica of the feedback current therethrough. The replicated feedback current is drawn from a circuit node (N1) which direc... | 10/10/2000 |
| 5726794 | DC bias controller for optical modulator A DC bias controller for an optical modulator includes an optical modulator, a demultiplexer, and a controller. The optical modulator intensity-modulates input DC light by a digital main signal superposed with a DC voltage to convert the DC light to an op... | 03/10/1998 |
| 5304941 | Sensor detection signal extracting circuit with offset voltage cancelling ability A sensor detection signal extracting circuit comprises a sensor, a control voltage generator, an adder, an amplifier, and a low-pass filter. The control voltage generator comprises two input terminals to one of which a voltage is applied based on the volt... | 04/19/1994 |
| 5218320 | Wideband amplifier circuit having automatic gain and offset voltage control A wideband amplifier circuit having automatic offset voltage and gain control, the circuit comprising a main amplifier chain, a negative feedback loop for controlling gain, and a negative feedback loop for controlling and cancelling any possible offset vo... | 06/08/1993 |
| 4918394 | Audio frequency power amplifier with improved circuit topology The present invention is an audio frequency power amplifier input circuit having improved vacuum tube circuit topology. The improved circuit includes a direct current feedback circuit within the input circuitry which stabilizes the operating point of a ph... | 04/17/1990 |
| 4633189 | NF tone control circuit An NF (Negative Feedback) tone control circuit in which a circuit gain of unity is maintained for a flat frequency response without the addition of active components. A voltage divider circuit which divides only an a.c. component of the output of an opera... | 12/30/1986 |
| 4453131 | Transformer coupled amplifier circuit A transformer coupled amplifier circuit that eliminates transformer induced non-linearities by way of a dual feedback path without sacrificing any of the inherent attributes of general transformer coupled amplifiers.... | 06/05/1984 |
| 4387345 | Precision gain AC coupled operational amplifier A precision gain AC coupled operational amplifier circuit utilizing an integrated resistor voltage divider network and switched capacitors is provided. Precise gain is obtained by the use of integrated capacitors, and a low frequency stabilizing pole in t... | 06/07/1983 |
| 3931582 | Isolated DC amplifier circuit 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 transfo... | 01/06/1976 |
