Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-01-26
1996-01-23
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340604, 340618, 324664, 324689, 73304C, G08B 2100
Patent
active
054868157
ABSTRACT:
A detector circuit in a moisture detector having an oscillator, a detector electrode and a common electrode for measuring the moisture content of wood and structural materials in buildings comprises a clamping diode network which couples an AC signal generated in the oscillator to a detector electrode. The clamping network clamps the AC signal to a reference voltage. The clamping network is balanced by a second clamping diode network which, together with a low pass filter, establishes the reference voltage. A low pass filter connected to the first clamping network produces an output voltage signal related to the impedance between the electrodes. To maintain the circuit's stability, the diodes in the clamping networks are thermally coupled.
REFERENCES:
patent: 3967197 (1976-06-01), Anderson
patent: 4683418 (1987-07-01), Wagner et al.
patent: 5317274 (1994-05-01), Nakagawa et al.
Lefkowitz Edward
Peng John K.
Wagner Electronic Products, Inc.
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