I remember there was a series of articles written in England by an author named "Cathode Ray". They were very interesting and well-written. Do...

I remember there was a series of articles written in England by an author named "Cathode Ray". They were very interesting and well-written. Do any of the oldtimers remember these articles, and can they point me to an archive? Many thanks. -- MRM

Apart from capacitor ESR checking, I use this meter for checking and tracking battery ESRs. Can anyone give me a safe upper voltage...

Apart from capacitor ESR checking, I use this meter for checking and tracking battery ESRs. Can anyone give me a safe upper voltage level opinion for not damaging the meter in this use? I have used it to check 2S Li-ion but could you get away with a 10S (42V) battery or 48V e-bike battery for example? The meter is too useful to damage! Or perhaps a standard capacitor in series would be a ...

Hi, all, Just wanted to pass along a new (to me) discovery. You know how when you try removing rosin flux with "flux remover" or a polar...

Hi, all, Just wanted to pass along a new (to me) discovery. You know how when you try removing rosin flux with "flux remover" or a polar solvent such as methanol or acetone, it leaves all this white crap behind? Yesterday I was in Advanced Auto Parts to get a can of Berryman B12 to clean out my fuel injectors. Just on spec, I bought a can of Carquest brake cleaner ($8ish for a 19...

Hi I need to fool a heat pump into controlling the output temperature. Normally the heat pump is controlled with an external NTC resistor...

Hi I need to fool a heat pump into controlling the output temperature. Normally the heat pump is controlled with an external NTC resistor (from 1kohm to 15kohm). I will control it with USB from a PC by connecting a controlled source. I have this one in my lab, but it only goes to 4kohm: https://www.orbitadigital.com/en/cctv/accessoires/tools/34781-uni-trend-ut714-temperature-p

I took a class many years ago, where they talked about creating separate power and ground planes for the analog and digital circuitry on a board. ...

I took a class many years ago, where they talked about creating separate power and ground planes for the analog and digital circuitry on a board. Of course, the ground planes would be joined at one location, typically under the chip that had both analog and digital signals, like an ADC or DAC. The high speed digital signals would be routed anywhere other than over the analog gr

I've heard that CAIG Deoxit D55-6 spray contact cleaner is the best. I have a can, but I can't find it. I can find a small can of LPS...

I've heard that CAIG Deoxit D55-6 spray contact cleaner is the best. I have a can, but I can't find it. I can find a small can of LPS Instant Contact Cleaner. Is that as good? Almost as good? (They don't sell that exact thing anymore. There are about 5 kinds of LPS ccleaner now.) Or should I keep looking for the Deoxit, or buy another can (cheepest is about $17!!)

Why do most "smart devices" seem to (needlessly?) inject a proxy into their communications with other devices? Arguable needs could...

Why do most "smart devices" seem to (needlessly?) inject a proxy into their communications with other devices? Arguable needs could include: - vendor wants to harvest usage information - vendor wants to snoop (gain some advantage) - vendor wants to act as a bastion host - vendor wants to supply service enhancements (e.g., DDNS) - vendor wants to keep device current (laughable) The firs...

Very recently, IEEE released the standards for the IEEE 802.11bb, for line-of-sight, secure communications between devices at near infrared. How...

Very recently, IEEE released the standards for the IEEE 802.11bb, for line-of-sight, secure communications between devices at near infrared. How is this different from IrDA, the standards for which were released around 1993. I did some investigation, but could not get anything concrete about it.

Lewin Edwards in his dosfs file system uses the ldiv() functions shown below: sector = ldiv(offset, SECTOR_SIZE).quot and offset =...

Lewin Edwards in his dosfs file system uses the ldiv() functions shown below: sector = ldiv(offset, SECTOR_SIZE).quot and offset = ldiv(offset, SECTOR_SIZE).rem Anybody know how this is declared or, maybe, defined? Hul

Imagine a 14-bit ripple counter driving an R-2R DAC, to make a stairstep waveform. I can clean up the glitches with a sample/hold. I'm clocking...

Imagine a 14-bit ripple counter driving an R-2R DAC, to make a stairstep waveform. I can clean up the glitches with a sample/hold. I'm clocking at 1 Hz. That works. I can export the waveform, but Spice picks the sample rate, and I get multiple data points per waveform step. Is there some way to plot and export one point per second, namely every waveform step? Later, I'll have all 14 c...