2016-06-06 - Gy Xu

MCU programmer taps power from PC’s serial port

Even with the serial port's limited capacity, serial-port power can still be a convenient power source for today's electronics. Here's…

2016-06-03 - Anthony Smith

Precise over-voltage protection with circuit breaker

Read about a simple circuit breaker that delivers precision over-voltage protection and over-current protection.

2016-06-03 - Marian Stofka

Detect leakage of capacitors, semiconductor switches

The low input-bias current of a voltage-follower op amp enables this simple fixture to measure the leakage current of capacitors.

2016-06-03 - Stefano Salvatori

Enabling a simple ohmmeter with gigohm range

Through the use of an external counter and control circuitry, this system can measure resistances in the tens of gigohms.

2016-06-02 - Marian Stofka

Comparator identifies peaks, valleys in waveform

In this article, we present a simple comparator circuit that locates peaks and valleys of a waveform in time.

2016-06-02 - John Lo

Testing low-current power supplies

Use this simple dual constant-current-load design, which can be built with inexpensive, common parts.

2016-06-02 - Djessas Zoheir

Two transistors make up high-precision, ac-mains ZCD

Here is a simple two-transistor circuit that can accurately detect the zero crossing of the ac mains voltage.

2016-06-01 - Stefano Salvatori

Spark current-ratio-to-frequency converter with integrator

Here is a precision integrator that generates a pulse train whose frequency is proportional to the ratio of two input…

2016-06-01 - Rex Niven

RC lowpass filter expands MCU’s output port

A simple lowpass RC filter enables a single output pin of a microcontroller to expand the number of output bits.

2016-05-31 - Mark Thoren

Recycle potentiometers as handy voltage sources

Read about a circuit that recycles old precision potentiometers that have direct-reading scales into useful laboratory "volt boxes".