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| More topics under "H03 - Basic electronic circuitry" (566,296) |
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| H03B - Generation of oscillations, directly or by frequency-changing, by circuits employing active elements which operate in a non-switching manner; Generation of noise by such circuits (23,314) | | H03C - Modulation (7,312) | | H03D - Demodulation or transference of modulation from one carrier to another (22,328) | | H03F - Amplifiers (75,745) | | H03G - Control of amplification (32,353) | | H03H - Impedance networks, e.g. resonant circuits; Resonators (70,349) | | H03J - Tuning resonant circuits; Selecting resonant circuits (13,088) | | H03K - Pulse technique (158,333) | | H03L - Automatic control, starting, synchronisation, or stabilisation of generators of electronic oscillations or pulses (43,760) | | H03M - Coding, decoding or code conversion, in general (119,714) |
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