[Icom] SM-20, HM12 and HM36

[Siu Johnny]

I am looking for a schematic diagram of SM-20.  Could you please advise 
where I can download it.

SM-20 is a very good desktop mic as everybody knows.  One of the most 
advantages is that there is an internal mic pre-amp.

I open up the HM12 and HM36.  I notice that the PCBs inside are less than 
halfly filled with plenty of empty circuity.  I would like to know whether 
it is possible to install a simple mic pre-amp inside these hand mics by 
making use of the PCB inside.

I am looking forward to your advice.

73

Johnny Siu VR2XMC




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