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Simple VOX
VOX is a voice controlled switch, used often for microphones replacing the classic switching button. The actuating threshold is set thru the volume potentiometer of the amplifier which command the VOX circuit. The VOX switching threshold is 600mV ( on R2 ) and the maximum input voltage must not be higher than 40Vpp.
NE/SA575 datasheet specifications
The NE/SA575 is a precision dual gain control circuit designed for low voltage applications. The NE/SA575’s channel 1 is an expandor, while channel 2 can be configured either for expander, compressor or automatic level controller (ALC) applications.
NE/SA575 applications: portable communications, cellular radio, cordless telephone, consumer radio, portable broadcast mixers, wireless microphones, modems, electric [...]
Voice, sound recorder circuit schematic
ISD1012, ISD1016 and ISD1020 are produced by ISD and allow sound voice recording and play-back. The last 2 digits show the maximum legth of recording time in seconds. This circuits contains a non-volatile memory which can memorise sound or voice without power supply up to 10 years. The circuit contains a microphone amplifier and a [...]
