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OpAmp - High Side Current Monitor

2015-03-01 17:21  
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OpAmp - High Side Current Monitor
The first circuit is a current monitor made with an LM358 OpAmp. While functional, the three diodes in the supply line make it unsuitable for most applications. Diodes D1, D2 and D3 are used to ensure that the voltage at the input terminals is at least two volts lower than the amplifiers supply voltage. This is undesirable as the voltage to the load is reduced and power is wasted as heat produced by the diodes. The circuit is good for experimenting as it can be made from readily available parts.