Voice keyer - parrot - ISD1820

iz oos
 

Hi, what about using cheap ISD1820 voice recorders kits as voice keyers? They seem to me they have a really high output, something like half a watt on a 8ohm load. If they can be used would a audio transformer 8-1000ohm really needed or would just unnecessarily elevate the voltage without any benefit? Would a 1:1 audio isolation transformer a better choice. How much attenuation would be necessary to prevent any damage of the mic input of the ubitx?

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