The circuit uses a 9V battery and a voltage regulator to produce a steady power-supply voltage of 5V. From that voltage, the circuit produces a constant sink current, which is independent of the ...

RTD measurement circuits The two most common methods to measure an RTD are constant current excitation (Figure 1 ) and constant voltage excitation (Figure 2 ).

Download this article in PDF format. High-brightness visible-light LEDs (VLEDs) require a constant-current source. This simple, RFI-free circuit takes advantage of the normally-on properties of ...

The voltage source varies between 0V and 20V, and there are three constant current circuits (from the left): The normal constant current circuit, one with the same transistor in the reversed-collector ...

But from there he moves on to the juicy bits. He builds a transistor-based constant current driver, then adds voltage regulation for the circuit as seen in the schematic on the left.

A ripple-generating circuit is usually needed to ensure stability of constant-on-time (COT) controlled buck converters. Different values of the ripple generating circuit can have direct impacts on ...

The two-transistor circuit gives the pale blue trace, which seems reasonably well behaved aside from some small wibbles. To look at the constant current circuits with different pwm voltages at 10kHz ...

But do you have any idea how those constant current circuits work? If not, then [Giorgos Lazaridis’] guide on LED driving and controlling methods will bring you up to speed in no time.