The ISD1420 United States ISD produced high-quality single-chip voice recording circuit, by the oscillator, the voice storage unit, preamplifier, automatic gain control circuit, anti-interference filter, the output amplifier. A minimum recording system only by a microphone, a speaker, two buttons, one all power, a few resistors and capacitors. Recording the content deposited in the permanent storage unit, providing zero-power message storage, this unique approach is by means of the patent of the United States ISD- direct analog storage technology (DAST TM). Use of it, voice and audio signals are stored directly to

IISDD1420P[11S\NoFilter_Guide_a5v100.pdf
IISDD1420P[11S

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