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Need help with electronics circuit
"Norm Freedman" wrote in message
om... Thanks for all the suggestions. This is really a simple application. I have no trim tab indicators. All I really need to know is if they are fully retracted or extended. When that happens, the motor current goes from about 8 amps to about 15 amps. Most of the time, the circuit is off. I just thought this would be a simple way to tell, using a waterproof LED. The most simple approach is to use a reed contact. You simply wind the power wire to the motor around the reed contact (a glass tube and the current though the coiled wire will produc a magnetic field that closes the reed contact. The number of turns needed depends on the sensitivity and size of the reed contact but can be determined by experiment. The goal is to find the ideal number of turns that does not close the contact at 8 amps, but does so at 15 amps. This solution gives no voltage drop or heat loss. And the obvious: you switch the LED with the reed contact :-) Meindert |
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