Up front: some background. The air-temperature sensor attached to my rain gauge became flaky...
Dropping a PRTD into a thermistor slot - impossible?
Buck regulator and two inductors make dual-polarity converter
A common problem for power-supply designers is to create a compact, dual-polarity step-down converter. If space and cost are not concerns, the obvious solution is a pair of DC/DC converters, one for each output...
Analog frequency doublers
High school trigonometry combined with four-quadrant multipliers can be exploited to yield sinusoidal frequency doublers. Nothing non-linear is involved, which means no possibly strident filtering requirements...
Drive any electronic clock with a high-precision 10-MHz reference
Most electronic clocks, be they analog or digital, use a crystal oscillator based on a 32.768 kHz crystal for their reference. In fact, it is same crystal that’s commonly used as a real-time clock for many microcontroller systems...
Improve PWM controller-induced ripple in voltage regulators
Simple linear and switching voltage regulators with feedback networks of the type shown in Figure are legion. Their output voltages are the reference voltage at the feedback (FB) pin multiplied by...
Hybrid relay basics: Why engineers are switching smarter
Hybrid relays are changing the way we think about switching inside electronic circuits. By combining the fast response of solid-state components with the reliability of mechanical contacts, these devices offer the best of both worlds...
Circuit controls ratiometric or simultaneous power-up of multiple rails
Many applications use FPGAs, ASICs, or DSP chips, which usually require multiple voltage rails, typically two: the core voltage and the I/O voltage...
Power bank "Keep-alive"
A simple module to keep power banks from turning off, when your DIY circuit draws low currents...
Increasing bit resolution with oversampling
Many electronic designs contain an ADC, or more than one, to read various signals and voltages. Often, these ADCs are included as part of the microcontroller (MCU) being used...
Unusual 2N3904 transistor circuit
A Planet Analog article, “2N3904: Why use a 60-year-old transistor?” by Bill Schweber, inspired some interest in this old transistor and how it’s commonly used, and if any uncommon uses might exist...