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FM1062 - Fudan

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FM1062 Low Voltage Transmission Circuits

positive line terminal gain adjustment; transmitting amplifier gain adjustment; transmitting amplifier non-inverting output; receiving amplifier gain adjustment; receiving amplifier inverting microphone input non-inverting microphone input NC negative line terminal receiving amplifier input dual-tone multi-frequency input mute input (see note 1) positive sup.

Features

‹ Low DC line voltage; operates down to 1.6 V (excluding polarity guard) ‹ Voltage regulator with adjustable static resistance ‹ Provides a supply for external circuits ‹ Symmetrical high-impedance inputs (64KΩ) for dynamic, magnetic or piezoelectric microphones ‹ Asymmetrical high-impedance input (32KΩ) for electrets microphones ‹ DTMF signal input with confidence tone ‹ Mute input for pulse or DTMF dialling
  – FM1062: active HIGH (MUTE)
  – FM1062A: active LOW (MUTE) ‹ Receiving amplifier for dynamic, magnetic or piezoelectric earpieces ‹ Large gain setting ranges on microphone and earpiece amp.

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