TiCK on 9 Volts???

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I'm building one TiCK as a "stand-alone" keyer. The construction manual
calls for a 12v supply. I would like to put the whole thing,including a
9 v battery in a Celestial Seasonings tin. Has anyone tried running the
TiCK with the 78L05 on 9 volts? The only data sheets I have (1975 vintage)
are for the LM78L05C and LM78L05AC and show a typical minimum dropout
voltage (Vin-Vout) of 1.7v which suggests that it might work. Would
appreciate any comments -- even those that point out how little I really
undrstand about the situation.

Thanks,

Bob AA0MC

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