If you got your start in electronics sometime after 1980 your first project might well have been to light up an LED. Microcontroller projects often light up an LED, too, and a blinking LED is ...

The 4-20 mA transmitters used in industrial current-control loops can be implemented as powered current sources, remote non-powered current sinks, or with several other I/O combinations. A useful ...

The thyristor or silicon-controlled rectifier (SCR) provides a convenient latching mechanism for switching power to a load. However, once the thyristor is triggered into conduction, it supplies no ...

Last time we looked at Spice models of a current sink. We didn’t look at some of the problems involved with a simple sink, and for many practical applications, they are perfectly adequate. However, ...

You can improve a current sink’s accuracy by at least two orders of magnitude by adding two standard 1%-tolerance resistors. As a bonus, you also compensate for errors that a low-current-gain pass ...

I have had mixed success with the seemingly simple op-amp and power mosfet current sink, but i think I am going to have another go. The idea is that feedback around the op-amp makes it impose Vin ...

I could have sworn I had put this circuit on the blog before, but having failed to find it, here it is, possibly again. Thanks to Lykos153 (from a comment below from): here is the original. I have ...