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SCR controlled bilge pump
Interesting discussion .
But why not simply use a Johnson float switch, the type with a rolling ball inside the float. These are designed to do exactly what Offbreed wanted, with less to go wrong. Alec "Offbreed" wrote in message oups.com... A long time ago, I saw a circuit using a silicon controlled rectifier as a latching relay to control a bilge pump. It used two float switches (one mounted higher than the other) and both had to be up to start the bilge pump. The pump continued to run until the lower float switch fell. The advantages were that the back flow from the hoses did not cause the pump to start again, and the low current demand allowed the switches to last longer. I cannot relocate the circuit, Does this ring any bells? Anyone know where to find the diagram? The only circuits I can come up with have the full pump current going through the lower switch, unless I go to a mechanical relay. |
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