Korean Multifunction Counter Teardown

[Thomas Scherrer] likes to tear down old test equipment, and often, we remember the devices he opens up or — at least — we’ve heard of them. However, this time, he’s got a H…

Simple STM32 Frequency Meter Handles Up To 30MHz With Ease

[mircemk] had previously built a frequency counter using an Arduino, with a useful range up to 6 MHz. Now, they’ve implemented a new design on a far more powerful STM32 chip that boosts the m…

Vintage Digital Frequency Meter Teardown

You think of digital displays as modern, but the idea isn’t that new. We had clocks, for example, with wheels and flip digits for years. The Racal frequency counter that [Thomas Scherrer] is …

Do Not Attempt Disassembly: Analog Wizardry In A 1960s Counter

[CuriousMarc] is back with more vintage HP hardware repair. This time it’s the HP 5245L, a digital nixie-display frequency counter from 1963. This unit is old enough to be entirely made of di…

To Turn An ATtiny817 Into A 150MHz Counter, First Throw Out The Spec Sheet

One generally reads a data sheet in one of two ways. The first is to take every spec at face value, figuring that the engineers have taken everything into account and presented each number as the a…

Clock Testing Sans Oscilloscope?

Like many people who repair stuff, [Learn Electronics Repair] has an oscilloscope. But after using it to test a motherboard crystal oscillator, he started thinking about how people who don’t …

Edge-Mounted Meters Give This Retro Frequency Counter Six Decades Of Display

With regard to retro test gear, one’s thoughts tend to those Nixie-adorned instruments of yore, or the boat-anchor oscilloscopes that came with their own carts simply because there was no oth…

NTP, Rust, And Arduino Make A Phenomenal Frequency Counter

Making a microcontroller perform as a frequency counter is a relatively straightforward task involving the measurement of the time period during which a number of pulses are counted. The maximum fr…