Signal level detector

Details Signal level detector Signal level detector

H - Electricity

03

G

330/21, 330/39

H03G 3/20 (2006.01) G01R 19/165 (2006.01)

Patent

CA 1138057

1 PHN. 9046 ABSTRACT: A signal level detector suitable for use in a recording amplifier of a cassette recorder for limiting the signal which is applied to the write head at a spec- ific average amplitude. Known signal level detectors normally use a high value capacitor for coupling a pre- amplifier having an input and an output; a comparator having a first input (base) coupled to the output of the pre-amplifier, and a second input (emitter) for detect- ing whether a detection voltage at the second input is exceeded by the voltage on the first input of the com- parator circuit; a reference voltage source (V ref), first means for maintaining the d.c. level at the output of the pre-amplifier at the level of the reference voltage source (V ref), and second means for raising the detection level of the comparator circuit by the reference voltage.

321700

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