why is this amp clipping?

Started by John Larkin in sci.electronics.design19 hours ago 27 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...


ECC memory module modification?

Started by geos in sci.electronics.design20 hours ago 28 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...


OT: A huge glob of "climate change"

Started by John Doe in sci.electronics.design1 day ago 79 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...


new (to me) all-pass circuit

Started by John Larkin in sci.electronics.design1 day ago 27 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...


slow (!!) controller for buck for IGBT

Started by buck in sci.electronics.design2 days ago 3 replies

does anybody know a buck (buck/boost) controller chip capable for very low speed (like 2kHz to 30 kHz)? I know that is totally not state of the...

does anybody know a buck (buck/boost) controller chip capable for very low speed (like 2kHz to 30 kHz)? I know that is totally not state of the art but power IGBT are slooow. I find millions of 500kHz, MHz chips and think I need the expertise of someone knowing the market. Sync operation or capability for multiphases might be nice. If the controller shortens pulses - there are minimum switch on...


MOSFET replacement cross-reference

Started by bitrex in sci.electronics.design2 days ago 4 replies

I'm looking for a replacement for this mystery-meat part from a major mfgr on Mouser/Digi-Key, used in a synchronous buck Not too much...

I'm looking for a replacement for this mystery-meat part from a major mfgr on Mouser/Digi-Key, used in a synchronous buck Not too much that matches exactly, with the low Vgth and all, this is what I come up with so far: It seems mfgr cheap ou


electrolytic cans

Started by John Larkin in sci.electronics.design3 days 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 ...


Flux cancellation

Started by Piotr Wyderski in sci.electronics.design3 days 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...


Negative logic

Started by George Herold in sci.electronics.design3 days ago 58 replies

I'd like a fast pulse from ground to -5V, is there anything wrong with running logic (74hc10) with Vcc=0 and ground at -5V? I'm not sure how...

I'd like a fast pulse from ground to -5V, is there anything wrong with running logic (74hc10) with Vcc=0 and ground at -5V? I'm not sure how I'll trigger it... maybe on the edge with an RC differential (high pass) and diode.


source of zebra strips

Started by David Eather in sci.electronics.design3 days ago 1 reply

Maybe of some interest, distributor is in the...

Maybe of some interest, distributor is in the US: https://www.fujipoly.com/usa/products/zebra-elastomeric-connectors/high-performance-silver-conne ctors.html?utm_source=Fujipoly2018&utm_medium=EETECH&utm_source=All+About+Circuits+Members&utm_c ampaign=e13df15d2f-EMAIL_CAMPAIGN_2018_01_16_COPY_01&utm_medium=email&utm_term=0_2565529c4b-e13d f15d2f-271218593 -- Using Opera's mail client: http://


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