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         Test points are indicated by *()*          B1 (9V)    B2 (9V)
                                                 + ? ? ? -   - ? ? ?+
  ?????????????????????????????????????????????????????????????????????/\/\/\?
  ?                          ? 390K ?  ?  ? 1uF 50V? ? ?    ?  ? ? ?  ? 2.2K ?
  ????????????/\/\/\?        ??/\/\/\??(??(???????????      ????? ?   ?  ?   ?
  ?  100K ?   5.6M ??????????(???????  ?  ?    ?-  + ?/\/\/\????? ? S1?    ???
  ???/\/\/\??????   ?        ?      ?  ?  ?    ?     ? 6.8K ? ?????  ??    ?
    photo  ??   ? ?????      ?  ???????????????????????????    ???   ?     ?
    L1463~???   ? ?????.05uF ?  ?   9  12 11   6     1    ?     ?    ?     ?
     ~~~~   ?>? ? ??????  50V?  ?                *(6-8V)* ? ??/\/\/\??     ?*
         ?????? ? / S2A?  ???)???7        U1              ? ?  6.8K ?      ?A
         ?    R ?/ ?T  ?  ???(???4                        ? ?1uF  -??/\/\/\??
   ????? ?      ????   ?  ???)???10      CA3018  *(3-4V, 5?????????? 100K ???
 ?\? M ??)???????      ?  ?  ?  ?                  50 mV  ? ? +  ????????????
 ? ? i ? ?             ?  ?  ?  ?                  peak to? ?    ? ??NPN    ?
 ? ? k ? ?             ?  ?  ?  ? *(4-5V)*          peak)*? ?    ????  PN   ?
 ?/? e ??????   390K ? ?  ?  ?  ? 8             3         ? ?       ?>??2222?
   ????? ?  ???/\/\/\???  ?  ?  ??????????????????????????? ?    ???????    ?
         ??????????????????  ?/\/\?            -??/\/\/\?????    ?   -  +   ?
         ?         ?        6.8K????? +       ?????  390K ?      ? ??????????
       ?????       ?         ?  ????? <-1uF-> ????? +            ? ?     1uF
        ???        ?             -?     50V     v 5K ? (Note A1) ? ?
         ?         ?              ???????????/\/\/\/\????????????? ?

	
A is 3-4V,        ??????????     ?????????????????????????        ?


    2V peak to peak?        ?                   .01    ???         ?
                   ?        ?    1.5K ?                 ?          ?
  (The section in  ?        ?????UUUUUUUU???????????????????????????
  the dotted box   ?        ?    ????????  (Audio type matching transformer)
  may be replaced  ?        ????????????????????????????
  with an    ......?.............. 500 ?               ?
  amplifier) :     ?      1K ?   :                 S2B/    -+       2K ?
             :     ?????UUUUUUUU?????????????????????/  ?????????/\/\/\/\??
             :        ? ???????? :    to          R      T 1uF ?    ???????
             :        ???????????????>     ???????????/\/\/\/\??          ?
             :            8 ?    : headset ?   ??????   47 K ? ? ?<????????
             :...................:         ?    ??? ?          ???PN2907  ?
                                           ?     ?  ?          ???PNP     ?
   *****                                   ?        ?          ???   *****?
   Emitter is HLMP3750 (visible red)       ?        ?  1K ?    ? ??????????
           or XC880    (Infra-red)         ?        ??/\/\/\/\?? ??????????
                                  ??????????        ?         ?? ?/\/\/\???
                                  ?    ??           ?         ? ?? 27? ? W?
                                  ???????????       ? (NPN    ????D40D5   ?
                                  ?    ??   ?       ? Power Tab) ?>??     ?
                                  ?         ?       ?????????????????     ?
                          S2C    /    ? ? ? ?                             ?
                                / ?????????????????????????????????????????
                            R    T    ? ? ?
                                      B3    (6V)

A1   This potentiometer is connected to " S1 ". 
Check Battery " B1 " for approx 2ma (milliampre) (.002 ampre) drain.
Check Battery " B2 " for approx 3 1/2 ma drain.
Adjust potentiometer on base of the NPN transistor untill the emitter
   diode draws approx 20 ma.

Phototransistor and Photodiode may be connected to the main assembly by
a length of shielded mike cable. 

Microphone is a crystal cartridge type (approx 1 inch diam.)

" R " is receive, " T " is transmit.
S2A-C need not be activated to receive. 

Use proper Infra-red lenses. Glass is OPAQUE to I.R. and will SEVERELY
degrade the performance of this device. Visible red may be used.
Red filters over phototransistor will assist the rejection of light
in the visible spectrum, and enhance the funtion of the amplifier.


Good luck. Be careful. I've done my best, but no promises.

(ps. Injection lasers may be substituted for the emitter in this circuit,
with PROPER MODIFICATION).

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