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Hooked up to power as well as a speaker. The resistors that are standing way off the board are only temporary as their value adjusts the gain, and they are much higher than recommended currently. (Although sound quality is good)
This PCB contains the circuitry to apply the DC polarising signal to the sensor and to detect and amplifier the return AC signal. The IC's have had their numbers removed in a (poor) attempt to hide the operation of the unit. The IC near the centre of the PCB seems to be an NE5534 op-amp the other 2 ICs are a quad op-amp and a dual op-amp,
The switch ('Area Tune' control) switches capacitors in parallel with the sensor coil to resonate it at the approximate frequency of the return signal.
87514787 :Piction ID--Tanks holding chemicals---Please tag these photos so information can be recorded.---- Digitization of this image made possible by a grant from NEH: NEH and the San Diego Air and Space Museum
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The main PCB of the 9801AR telephone. This model has a mechanical bell ringer. The 2 ICs on the board are the dialer control (top left corner) and speech hybrid (centre right). The hookswtich is the rectangular black device in the middle of the top row of components. The empty locations on the PCB are for a tone ringer circuit (used in the 9802AR) and some form of speech amplfiier.