1/4 oz copper

Started by Winfield Hill in sci.electronics.design2 hours ago 30 replies

Anybody ever ordered PCBs with 1/4-oz copper layers? -- Thanks, - Win

Anybody ever ordered PCBs with 1/4-oz copper layers? -- Thanks, - Win


IDC headers

Started by Phil Hobbs in sci.electronics.design2 hours ago

So a customer wants us to replace a board-mounted D9 connector with a cable assembly, so they can mount our board elsewhere in their box. (So...

So a customer wants us to replace a board-mounted D9 connector with a cable assembly, so they can mount our board elsewhere in their box. (So much of engineering involves the apportioning of pain between individuals and groups.) ;) I naturally looked at IDC connectors--D9 male IDCs are reasonably plentiful, with 30 choices at Digikey with gold contacts. But the other end, i.e. 50-mi...


Daily On/Off circuit?

Started by Terry Pinnell in sci.electronics.design2 hours ago 36 replies

My 15 year old 'Garden Lamps Unit' is switched on via an LDR, 4001 Schmitt, 4013 flip-flop and a relay. And switched off by an...

My 15 year old 'Garden Lamps Unit' is switched on via an LDR, 4001 Schmitt, 4013 flip-flop and a relay. And switched off by an ancient mechanical clock closing a contact which delivers a +ve going 12V pulse to the SET pin of the flip-flop, switching off the lamp around 11 pm. (BTW, intuitively I'd have expected that to be called RESET?) But not surprisingly the clock is unreliable, its han...


JTAG header highway robbery

Started by Phil Hobbs in sci.electronics.design2 hours ago 34 replies

Hi, all, So we're getting some parts for a small board fab--it's that VCA thing I talked about a week or so back. One of the biggest items...

Hi, all, So we're getting some parts for a small board fab--it's that VCA thing I talked about a week or so back. One of the biggest items in the BOM cost is the standard 10-pin mini JTAG header, Samtec FTSH-105-01-L-DV-K-A-P. It's now up to over four bucks! What do you folks use instead? Thanks Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innova...


9v Batteries

Started by OGEE in sci.electronics.design3 hours ago 47 replies

Looking for less expensive 9v alkaline battery. Please suggest best brands. I usually buy eight or so at a time. Forget Duracell as I...

Looking for less expensive 9v alkaline battery. Please suggest best brands. I usually buy eight or so at a time. Forget Duracell as I have given up on Duracell and Kirkland, THEY LEAK !!! Even just sitting in their original packaging many years before their use by date. These have ruined many devices. And NO I am not spending all my time removing and inserting batteries in all m...


smart bulbs?

Started by John Larkin in sci.electronics.design3 hours ago 2 replies

...

https://www.amazon.com/LOHAS-Equivalent-Automatic-Security-Lighting/dp/B0747QT5WW/ref=sr_1_4?ie= UTF8&qid=1550343306&sr=8-4&keywords=light+bulb+dark+sense If I put two of these in the same fixture, I wonder if they will confuse one another. Probably not. -- John Larkin Highland Technology, Inc lunatic fringe electronics


cheap diamonds at last?

Started by John Larkin in sci.electronics.design3 hours ago 10 replies

https://www.zerohedge.com/news/2019-02-08/made-china-diamonds-poised-rock-global-market GaN on diamond would be neat. Spread the heat...

https://www.zerohedge.com/news/2019-02-08/made-china-diamonds-poised-rock-global-market GaN on diamond would be neat. Spread the heat laterally, into a copper baseplate. -- John Larkin Highland Technology, Inc lunatic fringe electronics


Parts values on schematic question

Started by John S in sci.electronics.design3 hours ago 88 replies

I want to change from the old system like 1.2k to the new system like 1k2. But I would like to have a list to show me how to do that. For...

I want to change from the old system like 1.2k to the new system like 1k2. But I would like to have a list to show me how to do that. For example, I have 10 ohms. Is it just 10 or 10r0? How about 510 ohms? I assume a 1k is 1k0, yes? 1 meg is 1m0? TIA for any help.


microcontroller networking

Started by bitrex in sci.electronics.design3 hours ago 14 replies

What SICK man network fourteen 8-bit AVRs? The related project looks very interesting: I'm experimenting with using (smaller)...

What SICK man network fourteen 8-bit AVRs? The related project looks very interesting: I'm experimenting with using (smaller) clusters of 8-bitters for low-power processing/splitting a single UART input, that's sending large amounts of serial data from one input into multiple serial outputs but where n


attenuator

Started by John Larkin in sci.electronics.design4 hours ago 11 replies

...

https://www.amazon.com/Attenuator-3db-Sma-Module-Pack/dp/B07MWD949Z/ref=sr_1_21_sspa?ie=UTF8&qid =1550097003&sr=8-21-spons&keywords=sma+attenuator&psc=1 -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


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