Quote:
Originally Posted by bigus01
OK, I have wired as per Russell W.B's instructions and put a strap between T4 & T5 on the dial contacts terminal. This has the result of reversing the polarity in the handset and increasing voltage to 9v dropping to 5. Again the carbon inset works fine, but not the electret.
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Inside the handset I now have M1, R1 and R2 all -ve and M1 +ve.