As you can see in the above picture I build a Kraft Servo Tester. It tests both the old and new servos. There is a Dual +2.4 and -2.4 supply. This allows me to test the old servos that use a center tap in the battery pack. The circuit also has the power to run the Radio and servos.
Here only the two power supplies are finished. You can see the .01 uf caps around the full wave bridge. This keeps HUM out of the radio.
Above is the circuit I worked from. It contains a 555 circuit found on the net. There are also cheap testers found online. I wanted a circuit that would run old Kraft and other Servos that need the centertap from the batteries.
Email: John a quick question
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