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Electronics Dictionary - H

 half power point A frequency at which the power is 50% of maximum. This corresponds to 70.7% of maximum current or voltage. half wave rectifier A diode rectifier that converts AC to pulsating DC by eliminating either the negative or the positive alternation of each input AC cycle. harmonic Sine wave that is smaller in amplitude and some multiple of a fundamental frequency. Example: 880 Hz. is the second harmonic of 440 Hz., 880 Hz. is the third harmonic of 220 Hz. hartley oscillator An oscillator that uses a tapped inductor in the feedback network. henry The basic unit of inductance. HERTZ (Hz.) Unit of frequency. One hertz is equal to one cycle per second. high fidelity (Hi Fi)Sound reproduction equipment that reproduces sound as near to the original sound as possible high tension Lethal voltage in the kilovolt range and above. high-pass filter A tuned circuit designed to pass all frequencies above a desnigated cut-off frequency. Frequencies below the cut-off frequency are rejected or attenuated hole A gap left in the covalent bond when a valence electron gains sufficient energy to jump to the conduction band hologram Three-dimensional picture created with a laser. holography The science dealing with three-dimensional optical recording. horizontally polarized wave Electromagnetic wave that has the electric field in the horizontal plane. h-parameters (hybrid parameters) Transistor specifications that describe the component operating limits under specific circumstances. hybrid circuit Circuit that combines two technologies (passive and active or discrete and integrated components) onto one microelectronic circuit. Passive components are usuall made by thin film techniques, while active components are made with semiconductor techniques. hysteresis Amount that the magnetization of a meterial lags the magnetizing force due to molecular friction. In Schmitt Trigger
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