This is an older model with no wall wart. Does anyone know the voltage and polarity of the miniplug power supply? How much damage could I do starting with 5 v dc tip positive? I have $40 in the unit, so I am not eager to fry it. Thanks for any help.
Sometimes using a DMM in the diode position will give the polarity ingo; other times a multimeter in 1K range will be needed for the polarity info. Another way is to take the case off and do xome circuit chasing; at times that bay also give a clue as to the probable input voltage. Ane then again, some meters have the voltage on a case label.
Thanks for the ideas. I took the case off and found an 6- AA cell battery holder inside, and the red lead from the battery holder and the lead from the tip of the power socket were soldered together, so it should be a 9 volt tip positive wall wart. In the meantime, I am using batteries, and it works great.
Thanks.
I opened the case and found a 6 cell AA battery holder inside with the red lead and the socket tip lead soldered together, so it should be a 9 volt tip positive wall wart, I suppose. I wish all my other little mysteries were so easy to solve.
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.