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LM319N Phone Circuit detector

August 15, 2010 · Posted in Test equipment · Comment 

LM319N Phone Circuit detector for Repair using LM319N, 4027B, BC548 LM319N Phone Circuit detector for Repair using LM319N, 4027B, BC548

How make a thermostat in the room – Thermistor

November 9, 2009 · Posted in Switches · Comment 

let us make a thermostat in the room, this circuit energizes the relay when the temperature rises above a specified level. The second series of energy in the relay when the temperature falls below a preset level. Both series are virtually identical. The only difference between them is the polarity of the transistor. Thermistor value […]

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