AVO meters — literally amp, volt, ohm meters — are not very common in North America but were staples in the UK. [TheHWcave] found an AVO 8 that is probably from the 1950s or 1960s and wanted ...

There’s hardly any piece of test equipment more fundamental than a volt ohm meter. Today you’re likely to have a digital one, but for most of history, these devices had real needle meters. The ...

I don't know of another headphone amp built that way for less than $250, and most $250-$500 amps aren't built as well as the Magni. The amp has just one set of RCA analog inputs on its backside ...

However, a well-designed circuit designed using a standalone MCP3910 (analog front-end for metering applications) can produce a class 0.1 meter (0.1% accurate meter).

But as an added bonus, it also dropped the news that that amp, along with the Evo 75 and regular Evo 150 all-in-one players, would also receive a cool, analog-style digital VU meter and clock ...

In Figure 2, the resistive voltage divider comprising R 1 and R 2 connected to the op amp's noninverting input determines the meter's full-scale reading. You can add R F and C F to form an optional ...