Marantz tuner - data cell - in Marantz 19
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The middle symbol is for a neon bulb I believe. The top and bottom ones ares light dependent resistors. I would have guessed it's for muting but looked at the full schematic and that part is used there as Z501. It is described there as a photocell. I've seen similar devices in Kenwoods from the early seventies that used incandescent bulbs inside. Still the term "data cell" is a bit odd to me for Z601 and Z602 which is in the FM multiplex circuit. Maybe it's the 38kHz chopper? I didn't think neon bulbs were that quick though.
It's the LDR or light dependent resistor. An early opto coupler.
In the case of the 18 and 19 the LDR's manage the mute function and the stereo lamp.
See this for more info
In the case of the 18 and 19 the LDR's manage the mute function and the stereo lamp.
See this for more info
Sorry...I see that you already answered the question.
Don't be 'tx'! That's some great info!
The company I'm working for used to use a device that had a photo-resistor and LED potted together to perform level control such as in a voltage controlled attenuator. It was made by a company called Silonex. We had to dump that design when RoHS requirements came along as the cells had cadmium sulfide and cadmium was on the chemical no-no list.
The company I'm working for used to use a device that had a photo-resistor and LED potted together to perform level control such as in a voltage controlled attenuator. It was made by a company called Silonex. We had to dump that design when RoHS requirements came along as the cells had cadmium sulfide and cadmium was on the chemical no-no list.
