The ever innovative and prolific Mr. Woodward has offered “PWM-programmed LM317 constant current source”, an intriguing programmable constant current source which elicited a lively conversation in its comments section...

Almost every wall power supply has no indicator showing whether current is consumed by the load or not. It seems that this was a shortcoming that was not only noticed by me...

Figure gives a simple circuit for the PUSH ON, PUSH OFF function with only a few inexpensive components...

Figure’s negative constant current source has been a textbook application for the LM337 regulator forever...

When probing digital logic levels on a circuit board, locating the indicator of the logic level near the probe tip is convenient, so that you can keep both the indicator and probe tip constantly in sight...

Of the many types of analog filters available to designers, few allow easy adjustments of the filter parameters. The biquadratic, or biquad, filter is an exception, however...

LM317 fans will recognize Figure as the traditional LM317 constant current source topology...

A colleague asked for the measured jitter number on a single-supply comparator design based on the LM359 IC. He wanted to know how the jitter performance of the discrete comparator compared to an IC comparator, which was used with an ultrasound application...

Receiving infrared signals while conserving system power is difficult, and typically requires the inclusion of complex power-management routines in the firmware. You can avoid that problem by disconnecting power to the microcontroller when IR is not present...

Tachometry, the measurement of the speed of spin of rotating objects, is a common application. Some of those objects, however, have quirky aspects that make them extra interesting, even scary...