Google group users and spam.

Started by George Herold in sci.electronics.design50 minutes ago 32 replies

Hi, this is just for any other google users. I just got done spam IDing ~20 cheap drug posts. I sure wish some other google goop users would...

Hi, this is just for any other google users. I just got done spam IDing ~20 cheap drug posts. I sure wish some other google goop users would help with this. You just click on the triangle in the upper right corner of the post, (more message actions) Choose 'report abuse' and then spam. three clicks... it would just be nice to have some help. George H. (maybe you are doi


why is this amp clipping?

Started by John Larkin in sci.electronics.design52 minutes ago 3 replies

https://www.dropbox.com/s/bud5t07msshhldz/Clipping.jpg?raw=1 This is universalopamp2, level.2, and the current limit should be 1 amp. It's...

https://www.dropbox.com/s/bud5t07msshhldz/Clipping.jpg?raw=1 This is universalopamp2, level.2, and the current limit should be 1 amp. It's behaving like it has internal resistance in series with its output, or a soft current limit. If I use the level.1 amp, which presumably ignores the current limit parameter, it swings to the rails. -- John Larkin Highland Technology...


OT: A huge glob of "climate change"

Started by John Doe in sci.electronics.design57 minutes ago 66 replies

I am a hard-core scientist with respect for Germany, but... Germany's trashing of their nuclear reactors is the most painfully obvious lunacy...

I am a hard-core scientist with respect for Germany, but... Germany's trashing of their nuclear reactors is the most painfully obvious lunacy with respect to the issue of "climate change". Certainly that's their justification. They must have SOME justification. Looking stupid is not a valid cause. Instead of depending on greenhouse-gas-emissions-free nuclear power, now they are burning...


Activate PIR xmtr

Started by OGER in sci.electronics.design59 minutes ago 6 replies

Suggestions please. Taking a driveway PIR xmtr to modify for other purposes with no actual internal mods. Thinking of using some emitter...

Suggestions please. Taking a driveway PIR xmtr to modify for other purposes with no actual internal mods. Thinking of using some emitter taped to the PIR window to activate the xmtr. Something as simple as a blinking LED to keep the xmtr transmitting while the LED is blinking. Using one of these. 4VWIN Wireless Home Security Driveway Alarm https://www.amazon.com/4VWIN-Wirel...


ECC memory module modification?

Started by geos in sci.electronics.design2 hours ago 20 replies

Some time ago I found Intel video that shows the benefit of ECC memory. The video presents modified ECC memory module with a switch that induces...

Some time ago I found Intel video that shows the benefit of ECC memory. The video presents modified ECC memory module with a switch that induces memory error, then it shows how i5 can't handle such error and how Xeon processor can. Here is the video in question, they show module at time 28-29s: https://www.intel.com/content/www/us/en/processors/xeon/the-value-of-ecc-memory-for-servers.h...


Transformerless Power Supply

Started by amdx in sci.electronics.basics4 hours ago 10 replies

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus...

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus depending on other components. Maybe 9- 20uf caps in parallel? I'd like to build it into a leaf blower. All plastic, absolutely no metal exposed. I think I've answered my question, I have 12, X rated caps in my junk box, but they are only...


new (to me) all-pass circuit

Started by John Larkin in sci.electronics.design6 hours ago 13 replies

It occurred to me that, in the conventional opamp all-pass 90 degree phase shifter...

It occurred to me that, in the conventional opamp all-pass 90 degree phase shifter circuit, https://www.dropbox.com/s/nfwd32p3z61g15y/90_degree.JPG?raw=1 a fast signal passes through all the opamp stages, so all the amps have to be fast. In this one, https://www.dropbox.com/s/rulyvlt072k49cp/New_All-Pass_1.jpg?raw=1 the fast signals just rip through the big caps in the slow stage...


electrolytic cans

Started by John Larkin in sci.electronics.design9 hours ago 36 replies

I'm doing the synchro/resolver board and the top will be paved over with transformers. So a lot of parts will have to go on the bottom...

I'm doing the synchro/resolver board and the top will be paved over with transformers. So a lot of parts will have to go on the bottom of the board. We usually space these boards off the the aluminum box with 0.25" PEMs. This is the sort of box we'll use: https://www.dropbox.com/s/sz4hkou4vm1yrkn/DSC04872.JPG?raw=1 The tallest parts will be electrolytic caps. So does it matter if ...


Temperature of CCFL transformer in laptop?

Started by Joerg in sci.electronics.design11 hours ago 28 replies

A laptop backlight was turning off after a few minutes of work and, miracuslously, when turning the laptop off (invokes hibernate) it always...

A laptop backlight was turning off after a few minutes of work and, miracuslously, when turning the laptop off (invokes hibernate) it always came back on. I opened the screen, reseated the inverter connectors, so far it ran through more than an hour. Here's knocking on wood. However, I noticed that the transformer core on the CCFL inverter heats up to the point where leaving my finger o...


Flux cancellation

Started by Piotr Wyderski in sci.electronics.design13 hours ago 3 replies

In this short movie the guy explains the technology behind his 1kW LLC converter: https://youtu.be/wtcn6rZE1Eg At 0:57 he replaces a...

In this short movie the guy explains the technology behind his 1kW LLC converter: https://youtu.be/wtcn6rZE1Eg At 0:57 he replaces a monolithic 16:2x1 transformer with 4 4:2x1 transformers, which is a basic matrix transformer technology. OK. At 1:50 he merges two U-shaped transformers into a single E core, still fine. At 2:04 I got lost. He removes the center leg of the E core, b...


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