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Test Equipment Anonymous (TEA) group therapy thread

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AVGresponding:

--- Quote from: Vince on June 24, 2022, 09:51:52 pm ---
--- Quote from: bd139 on June 24, 2022, 09:13:21 pm ---
--- Quote from: tggzzz on June 24, 2022, 09:04:48 pm ---
--- Quote from: bd139 on June 24, 2022, 08:51:59 pm ---Personally the old CMOS 4000 series are DEAD other than the CD4007 which is still quite useful as it's basically uncommitted MOSFET inverter which can be snuck into various analogue circuits.

--- End quote ---

The 4000 series have one nice characteristic: operation at IIRC 3V to 15V

Back in the late 70s I used some to build a fllter with a Q of 4000 using 10% capacitors, capable of measuring 1pW using  bog-standard LF351 op amps, and a dynamic range of 180dB (90dB optical).

--- End quote ---

Yes and no. A lot of the characteristics were wide across the voltage range which was a big problem. A fine example I saw was a car alarm built around a couple of CD4001's. It only worked properly if the battery was above about 11.5 volts. So if you didn't use your car for a few weeks then it'd go off all by itself  :-DD


--- End quote ---

You are a bad mouth, you simply failed to appreciate the rich feature set of this alarm. It has an option to alarm you when your battery is running low, which is useful in itself !
Especially on modern cars I hear, where a low battery can upset lots of ECU all around the car and they fill the main ECU with thousands of nonsensical errors that don't even exist  :palm:

--- End quote ---

Frequently a self-created alarm, as the drain currents on some of these aftermarket systems were ludicrously high (into the tens of milliamps!).

capt bullshot:

--- Quote from: mansaxel on June 25, 2022, 07:00:53 am ---A request to go against the spirit of the group:

At work, we've established that we need a Timing Interval Analyser. I tried buying the one Robert had for sale, but was too late. Does anyone else have a hp 5371A or one of the Yokogawa TA series, or similar, they'd be willing to part with?

It needs to be reasonably well working (another break with the spirit) and it can cost some money (again, against the very moral fibre!) but not "Korea instrument reseller insane".  An official-looking invoice is a cool thing.  In Europe is a definite bonus.

Ice-Tea?

--- End quote ---

This guy:
https://messgeraete-markt.de/

A well known seller of TEA (at least for some of the German members of the TEA party), has some of the Yokogawa TA series (320, 520, 720) in his stock.
IMO, he can meet all your criteria.

He's also got an ebay shop, and his stock definitely is larger than what is shown at the website and ebay listings. So just contact him (Mr. Knopf) and ask what he's got for you.

bsdphk:
I have a 5372A in good shape in Denmark which I almost never use any more.

Drop me an email, phk/freebsd.org

nfmax:

--- Quote from: Robert763 on June 25, 2022, 07:24:30 am ---
--- Quote from: tggzzz on June 24, 2022, 09:04:48 pm ---
--- Quote from: bd139 on June 24, 2022, 08:51:59 pm ---Personally the old CMOS 4000 series are DEAD other than the CD4007 which is still quite useful as it's basically uncommitted MOSFET inverter which can be snuck into various analogue circuits.

--- End quote ---

The 4000 series have one nice characteristic: operation at IIRC 3V to 15V

Back in the late 70s I used some to build a fllter with a Q of 4000 using 10% capacitors, capable of measuring 1pW using  bog-standard LF351 op amps, and a dynamic range of 180dB (90dB optical).

--- End quote ---

And of course the 4046 PLL . 4000 series small scale logic is no moer dead than any other small scale logic that isn''t 3.3V or less.
It's just the dragon stirring.

--- End quote ---

4000 series CMOS is very useful indeed! First, it's slow, so that it suffers far less from glitches, EMI & transient problems than modern logic families. Then it is very tolerant of wide supply voltage ranges, ideal for running off batteries. When not switching, it is extremely low power - basically nothing, which is also great for battery powered devices. Because of the high voltage tolerance and relatively large geometry, an ordinary 4000 series output can (usually - check the datasheet) source or sink enough current to supply other parts of the system. So they can be turned off when not needed to further save battery power.

Here's an example: a remote cesspit monitor. Every 2:13 it wakes up and transmits a radio message telling if the float switch in the tank is indicating high level or not. Runs off 4 AA batteries, which should last about 7 years according to my calculations.

A special bonus point to the first person to correctly describe what purpose D1 serves

bd139:

--- Quote from: Robert763 on June 25, 2022, 07:24:30 am ---
--- Quote from: tggzzz on June 24, 2022, 09:04:48 pm ---
--- Quote from: bd139 on June 24, 2022, 08:51:59 pm ---Personally the old CMOS 4000 series are DEAD other than the CD4007 which is still quite useful as it's basically uncommitted MOSFET inverter which can be snuck into various analogue circuits.

--- End quote ---

The 4000 series have one nice characteristic: operation at IIRC 3V to 15V

Back in the late 70s I used some to build a fllter with a Q of 4000 using 10% capacitors, capable of measuring 1pW using  bog-standard LF351 op amps, and a dynamic range of 180dB (90dB optical).

--- End quote ---

And of course the 4046 PLL . 4000 series small scale logic is no moer dead than any other small scale logic that isn''t 3.3V or less.
It's just the dragon stirring.

--- End quote ---

It’s definitely dead. Noise immunity is terrible at lower voltage and as of a number of years ago I understand there’s only one fab still running the 10um process which means that they aren’t going to produce them in huge numbers. Building a new product on them is risky. It was on the no stock list at a company I worked for 20 years ago with a forced transition to HC.

There’s an HC4046 PLL and even that’s dying. Nexperia kicked out a HCT9046 which was vastly superior to both. And then there’s the LV4046A which has an extra phase comparator to play with and will quite happily run to 30MHz or so!

Absolutely fine for the odd thing here and there within the known constraints of course.

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