Shock-induced AL changes

Started by Piotr Wyderski in sci.electronics.design14 hours ago 25 replies

I made recently a weird discovery. I was dividing small toroidal cores made of P40 (a mundane Mn-Zn ceramic, nothing fancy) into bins for the...

I made recently a weird discovery. I was dividing small toroidal cores made of P40 (a mundane Mn-Zn ceramic, nothing fancy) into bins for the new batch of magamp experiments. Even the small shock induced by dropping the core from the height of one inch onto a wooden table was enough to move its AL by about 10%... upwards. The cumulation of microcracks would result in something like the distr...


Auto-off devices that draw more than a milliamp in their off state.

Started by Sylvia Else in sci.electronics.design20 hours ago 1 reply

This is for something that is battery powered. Rubbish design. Why do they do that? Sylvia.

This is for something that is battery powered. Rubbish design. Why do they do that? Sylvia.


question about Putty

Started by John Larkin in sci.electronics.design23 hours ago 31 replies

I'm using Putty to talk through a serial port to a dumbish device, sort of glass teletype mode. That works. But if I'm in the serial...

I'm using Putty to talk through a serial port to a dumbish device, sort of glass teletype mode. That works. But if I'm in the serial session, can I grab a local text file and shoot it to the device, instead of typing a huge block of text? The Putty documentation is not helping me much here. -- John Larkin Highland Technology, Inc lunatic fringe electronics


Audiophoolery?

Started by Cursitor Doom in sci.electronics.design23 hours ago 38 replies

Gentlemen, I came across this comment in a YT video on thermionic valve (toob) audio amplifiers and would be interested to hear your entirely...

Gentlemen, I came across this comment in a YT video on thermionic valve (toob) audio amplifiers and would be interested to hear your entirely subjective (and indeed objective!) views on this recondite matter... "Personally I am a tube fan for the audio qualities that only a tube amp can produce. Is it as accurate as a solid state amp? No way. Not even close, but it is the way the e...


Where is the best position to combat RFI

Started by amdx in sci.electronics.design1 day ago 12 replies

I have three sources of RF at my house, all are on the same breaker. Two sources are IR sensor Yard lights and the other is my garage door...

I have three sources of RF at my house, all are on the same breaker. Two sources are IR sensor Yard lights and the other is my garage door opener. OK, I just solve the garage door opener, it was actually the two florescent lights I run from the outlet on the Garage door opener. Just reseating the tubes eliminated the noise, that may need to be revisited later. So the two yards light...


OT: Blackholes could be from the future

Started by Anonymous in sci.electronics.design1 day ago 4 replies

Yo my latest lovely crazy theory/hypothesis ! 1. First of all einstein was a complete idiot ! ;) WW4 will not be fight with sticks and...

Yo my latest lovely crazy theory/hypothesis ! 1. First of all einstein was a complete idiot ! ;) WW4 will not be fight with sticks and stones, because nothing will be left ! LOL. 2. When the aliens or we come to start WW3, 1 little god particle will consume the earth... and perhaps even create a blackhole... destroying all ! And thus I come to the conclusion: That the blackholes that w...


Fincor PID dancer schematic or Manual needed

Started by M Philbrook in sci.electronics.design1 day ago

I know many of your old farts here have a collection of schematics or at least manuals.... I can not find the manual or maybe even the...

I know many of your old farts here have a collection of schematics or at least manuals.... I can not find the manual or maybe even the schematic that sometimes comes with these manuals for a : Fincor 105456401 , 1900-77 This is a PID dancer controller with a tach following option. If need be I can reverse engineer one using TinyCad or some common free electronic ...


Enclustra business model

Started by Piotr Wyderski in sci.electronics.design2 days ago 7 replies

The schematics of their Zynq modules is not publicly available and they have just refused to send me a copy because it is only available to get...

The schematics of their Zynq modules is not publicly available and they have just refused to send me a copy because it is only available to get them after the purchase. How could I know if I want to purachase their modules at all if there is no way to check how is the RTC connected to the FPGA chip or how many analog inputs are available? What happened to those guys? Best regards, Piot...


Transformer questions

Started by Anonymous in sci.electronics.design2 days ago 17 replies

If we take a big pile of random laminated EI core mains transformers with no known manufacturer specs other than output VA & voltage... When...

If we take a big pile of random laminated EI core mains transformers with no known manufacturer specs other than output VA & voltage... When powering them on 220-240v, how much VA can safely be drawn from the halfway primary tapping? What are the effects of exceeding manufacturer power output ratings? What temperature cutout stuck to the outside of the EI core would protect these transfor...


Using matched pair PNP BJTs and analog MUX to measure cells in battery pack

Started by P E Schoen in sci.electronics.design2 days ago 8 replies

My previous post was for an analog MUX using discrete MOSFETs and a flying capacitor for voltage measurement of the cells in a battery pack....

My previous post was for an analog MUX using discrete MOSFETs and a flying capacitor for voltage measurement of the cells in a battery pack. That seems to be a workable design and I am going to get some prototype PCBs made to prove the concept. But I also considered a design using a DG409 (for 4 cells) or two DG408s (for 8 cells). To do that properly involves an instrumentation amplifier...


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