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Old 16th Feb 2018, 5:17 pm   #37
dagskarlsen
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Join Date: Jan 2008
Location: Hakadal, Norway
Posts: 640
Default Re: Kellogg wall phones - need help

Congratulations, it has been interesting to be a part of this, and I have learned something this time too. As Dave says a handset from the right era will be better, until then you could increase the voltage to 3 or maybe 4.5 V. Use an ampere-meter and monitor the current to be 20-35 milli-amps, then you will be close to the right voltage for that setup. Use the smallest voltage that pulls the current over 20 milli-amps.
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