Design Ideas

Sample-and-hold amplifier holds the difference of two inputs
A sample-and-hold amplifier tracks and holds the difference of two input signals.... more

Microcontroller controls analogue phase shifter
By using a digital potentiometer in a phase-shift circuit, a microcontroller can precisely control phase shift.... more

Microcontroller moving-dot display interface uses three I/O lines
A moving-dot LED-display interface to a microcontroller uses only three output pins.... more

Microcontroller detects pulses
A microcontroller detects output pulses in a device under test.... more

Touch-activated timer switch extends battery life
Designed to fit into the battery compartment of an optical mouse, this circuit automatically shuts off the battery after a time delay.... more

Programmable current source requires no power supply
A programmable current source is useful for creating I-V curves, charging and discharging batteries, preloading power supplies, and many other applications.... more

Tester cycles system-power supplies
A simple two-relay circuit cycles system power on and off to test a design on the benchtop.... more