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Teknetics Mark 1 (red box)

Hi Folks,

I am looking for the specs on the charger for this Mark 1 unit I have. Replacing 14 batteries every 3 or 4 hunts is a bit of a chore!!


New member
Posted by George Payne on 9/4/2006, 8:27 pm

Teknetics 9000B, 8500B and Mark 1 Charger:

Input: 120 V 60HZ 8W, Output: 10V AC @ 1.4 VA

All these detectors required a AC charger. The reason has to do with the circuit used in those detectors. In the original design a 6 cell and 8 cell battery pack is connected in series. One of the charger wires is connected to the connection point of the two battery packs. The other charger wire is connected to two diodes that alternately charge one then the other battery pack as the line frequency changes polarity. Therefore, if you connected a DC charger to one of these detectors only one battery pack would charge. The other battery would never receive any charging current. As I said the original system used two packs. One pack supplied 9.6 volts the other 12 volts. The original AC charger output voltage was specifically designed to charge a 8-cell (1.2v/cell) pack. Therefore, a resistor is used in series with the 6-cell pack to limit the charging current in that pack.