Articles and news - 4

Unusual 2N3904 transistor circuit
Unusual 2N3904 transistor circuit
Oct 5, 2025 Articles

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...

Qorvo introduces TDD beamformer IC compact
Qorvo introduces TDD beamformer IC for compact, power-efficient Ku-band SATCOM terminals
Oct 2, 2025 News

Qorvo announced the release of a Ku-band beamformer IC designed to meet the growing demand for terminals that support time-division duplexing  in compact and power-sensitive SATCOM applications...

PWM buck regulator interface generalized design
PWM buck regulator interface generalized design equations
Oct 1, 2025 Circuits

A while back, I published the Design Idea “Simple PWM interface can program regulators for VOUT < VSENSE”. It showed some simple circuits for PWM programming of standard bucking-type regulator chips...

Four-channel thermocouple measurement integrated conditioning now
Four-channel thermocouple measurement with integrated conditioning now possible with ±1.5 °C system accuracy
Sep 30, 2025 News

Microchip Technology has overcome a thermal measurement and integration barrier with the first single-chip, four-channel I2C thermocouple conditioning IC...

temperature-compensated calibration-free anti-log amplifier
A temperature-compensated, calibration-free anti-log amplifier
Sep 29, 2025 Articles

The basic anti-log amplifier looks like the familiar circuit of Figure...

HOLTEK new BA76220 passive infrared sense
HOLTEK new BA76220 passive infrared sense IC
Sep 29, 2025 News

Holtek is delighted to announce the release of its new passive infrared body detection IC, the BA76220, which is specifically designed for security...

Capacitor matchmaker
Capacitor matchmaker
Sep 28, 2025 Circuits

Precision-matched capacitor pairs are commercially available items, but only in a limited range of values, working voltage, and dielectrics...

Fake contacts bounced order
Fake contacts, bounced to order
Sep 25, 2025 Circuits

Many recent Design Ideas have involved button-pushing to control power. Some may have been more resistant to contact-bounce than others – but how can we really check that?...

Revisiting micro PC1237 classic audio amplifier
Revisiting µPC1237, a classic audio amplifier
Sep 24, 2025 Articles

This is just an ultra-quick blog post about a nostalgic IC: µPC1237...

Positive analog feedback linearizes 20 mA
Positive analog feedback linearizes 4 to 20 mA PRTD transmitter
Sep 23, 2025 Circuits

I recently published a simple design for a platinum resistance detector 4 to 20 mA transmitter circuit...