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Encyclopedia of radio electronics and electrical engineering / Audio equipment
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The voice recording/playback circuitry of this unit is based on Holtek's HT8656 CMOS LSI and 81256Kx256 Dynamic Random Access Memory (DRAM) 1 chip. The sampling rate can be 16Kbps or 32Kbps, which provides 8- or 16-second write times with 256Kb DRAM. 64 KB DRAM can be installed if a shorter write time is suitable for the device using the scheme. The circuit is powered by a 9 V battery.
(click to enlarge)
Note. Capacitor ratings are in microfarads (µF).
Publication: N. Bolshakov, rf.atnn.ru
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