Re: 1.5Volt supply
Just checked the lm317t min input is 4.2 v so this should be ok with 5 volts in to 1.5 volts out . The cassette player probably uses a DC to DC converter ,the battery lasts a good while ,I think I could just about squeeze the LM317 and other bits in the battery compartment . Thank's for all the suggestions . Mick.
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