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Author Topic: AEA Isoloop 1/2 step motor mod  (Read 1330 times)
KB7URX
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Posts: 2




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« on: April 03, 2005, 01:19:45 PM »

For those of you who still have and use the AEA Isoloop, here's a quick mod to make the tuning capacitor motor do the "half-step". It really sharpens the fine tuning.

1) Open the case of the LC-2 controller and locate the stepper motor driver chip SAA 1042(U3).

2) Find pin 8 and using fine diagonal cutters, snip it off flush with the pc board, then carefully bend it up til it's away from the board.

3) Using a miniature SPDT toggle switch, solder a 2" piece of #22 AWG wire from pin 8 to the center(pole) on the switch.

4) Solder another 2", #22 AWG wire from one of the teminals of the switch to ground.(doesn't matter which)

5) Solder a third piece of 2", #22AWG wire from the last switch terminal to a convienient +12 supply point.

When switch pulls pin 8 to ground, the motor will advance 1 full step/clock pulse, when the switch pulls pin 8 high, the motor will advance 1/2 step/clock pulse. This will effectivly double the motors resolution from 200 steps/rev, to 400 steps/rev, greatly improving the ease of tunability of the capacitor.

73
Doug
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KK2QQ
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Posts: 40


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« Reply #1 on: December 11, 2011, 08:58:03 PM »

This mod also works well on the IT-1 Isotuner
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