Cancel PWM DAC ripple and power supply noise
Here are more PWM ripple-cancellation design ideas.
Universal logic element on one transistor and its applications
Here's a proposed design for a universal passive logic element of positive and negative logic, made on just one transistor.
CMOS flip-flop used “off label” implements precision capacitance sensor
Different ways to use the CD4013B dual-D CMOS flip-flop for purposes that it was not originally intended for.
Time for a second 3D printer in the lab
The low-cost resin printer has been refined to the point of being a must-have in a lab.
Integrated power loss brake features lower energy consumption and reduce costs in data-center fan applications
Fan drivers with power-loss braking capability are presented as options that provide the desired improved safety and thermal efficiency while simplifying fan design and logistics in modern server applications.
Adjustable triangle/sawtooth wave generator using 555 timer
This Design Idea creates an adjustable triangular and sawtooth waveforms using a 555 timer.
Precision DC motor speed control via pot or DAC
Here's a Design Idea for a winding-resistance-cancelling motor drive with a pot or with a DAC.
Inductor-based astable 555 timer circuit
This Design Idea presents a 555 multivibrator circuit that relies on an inductor instead of the usual capacitor to set the timing characteristics of the timer circuit.
Linearized portable anemometer with thermostated Darlington pair
This self-heated constant-temperature-delta transistor anemometer is cheap, rugged, and sensitive.
Improved comparators for better designs
Analog and digital comparators allow you to compare input signals by their level.