Hello,
What type of external power supply 12V is recommended for a use of the telescope " Bresser 90-62100 National Geographic " on at least all of a night of 8 hours (Type, Brand, amperage)?
A power supply by 6 piles of 1,5 V (thus 9 volts) is installed on the device. It does not allow a functioning of the telescope on a sufficient duration. It can be substituted by an external power supply of 12 volts... How to explain the difference of tension (between 9V and 12 V)?

Thank you for your answer.

jmb.golf@orange.fr

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