The tape recorder will be turned on when it detects a preselected level of sound. Once the sound goes away circuit will turn off after a short delay. Use CMOS 74HC14. Kit doesn't improve sensitivity of tape recorder itself.

Typical propagation delay: 13ns

Wide power supply range: 2 ~ 6V

Low quiescent current: 20 uA Max. (74HC Series)

Low input current: 1uA Max.

Typical hysteresis voltage: 0.9 at VCC=4.5V

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