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Voltage Control Circuit

Sep 23, 2018adminProjectDAC, esp8266, espressolite2.0, feature, LinearTech, LTspice, Op-amp, PSU, PWM

Voltage controller Lastly, we need a voltage controller that allow user to switch from 0v to 20v. We can use a simple 10x gain op-amp system and a DAC to do this. DAC that operate in I2C can be easily control by microcontroller to vary voltage from 0 to 2.048v and then send to op-amp

Current Limiter Circuit

Sep 23, 2018adminProjectDAC, esp8266, espressolite2.0, feature, LinearTech, LTspice, Op-amp, PSU, PWM

Current limiter Sensing the current is only part of this system. We need another part as reference to limit the current flow and it must be in digital form so that we can control it using microcontroller. Yes, by using PWM from microcontroller and a simple second order low pass filter, we can make a

Shunt as Current-to-Voltage Converter

Sep 23, 2018adminProjectDAC, esp8266, espressolite2.0, feature, LinearTech, LTspice, Op-amp, PSU, PWM

Shunt and Current-to-Voltage Converter Shunt is a resistor that carrying a very small value of resistance, normally 1 Ohm. Shunt usually takes important role in current measurement. In our famous equation, V = I * R when R = 1 ohm, voltage across that resistor must equivalent to current value. For example, if voltage across