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Shown above is a device for making a contact in a sensitive way by simply touching a key with the finger. Since it comprises no mechanical parts, its reliability and life are high.
English (United States)
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CMOS Sensitive Contact
Shown above is a device for making a contact in a sensitive way by simply
touching a key with the finger. Since it comprises no mechanical parts, its
reliability and life are high.
The sensitive key is used with a simple logic circuit for detecting the contact
status without requiring any initial adjustment. This is done by detecting an
The input of a high input impedance amplifier comprising CMOS gate G1 is
connected to sensitive metallic key K1. No signal is provided at the output of
gate G1. When the key is touched, a periodical clamped signal is provided due
to the amplified electrical noise which saturates CMOS gate G1.
The status change at the output of CMOS gate G1 is detected. This causes
bistable latch L1 to be latched.
CMOS gate G2 and key K2 are used together with an OR circuit,
retriggerable single-shot SS1 and single-shot SS2 to reset latch L1 to its initial
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