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spark plugs

Started by RichD in sci.electronics.design7 months ago 29 replies

I recall working on an arc lamp power supply, which used a spark gap for ignition. I wondered, and still do, are there any design techniques...

I recall working on an arc lamp power supply, which used a spark gap for ignition. I wondered, and still do, are there any design techniques or formulas, to obtain a specific desired voltage pulse across the gap? Or is it cut and try, regarding the gap size and current? (the current break, that is) -- Rich


Favorite peak detector?

Started by Klaus Kragelund in sci.electronics.design7 months ago 24 replies

Hi I have a voltage, only present for halfsine peak of 2MHz (500ns wide), which is 500V peak. I need to know the peak voltage, in an...

Hi I have a voltage, only present for halfsine peak of 2MHz (500ns wide), which is 500V peak. I need to know the peak voltage, in an embedded system where the ADC samples at max 5MSa. So way too slow to find the peak. Figure 7-23 of this datasheet has a classic peak detector: https://www.ti.com/lit/ds/symlink/lmc6482.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1703


I think this will work??

Started by rhor...@gmail.com in sci.electronics.design7 months ago 37 replies

Actually, I am fairly sure - but not certain - it will work, and I am a little less sure it will work well enough. I have included a link to a...

Actually, I am fairly sure - but not certain - it will work, and I am a little less sure it will work well enough. I have included a link to a schematic of the design below. "Switch 1" is actually a GPIO output pin from an Arduino, and R5 is actually A Raspberry Pi. The intent is to have the Arduino shut down the RPi when a certain variable is true and turn it back on when the va


Spice Simulators - ngspice v. ltspice ?

Started by Dan Purgert in sci.electronics.design7 months ago 34 replies

I've never used ltspice / circuit simulators before; though based on seeing posts to the group from various people seems it's something I might...

I've never used ltspice / circuit simulators before; though based on seeing posts to the group from various people seems it's something I might find useful (noting, of course, this is a hobby rather than something I get paid for). Looked it up, and seems ltspice is a windows/mac application, whereas the native equivalent on linux would be ngspice. To avoid starting with one and switching ...


Ixys/Littlefuse NCD2100 strangeness

Started by John Larkin in sci.electronics.design7 months ago 6 replies

NCD2100 is a digital capacitor. We use it in a couple of products to tune an LC oscillator at powerup, to get close to 50 MHz. Then...

NCD2100 is a digital capacitor. We use it in a couple of products to tune an LC oscillator at powerup, to get close to 50 MHz. Then a narrow-pull-range varicap takes over. What happens, when the oscillator starts up, is that the frequency chirps, namely jumps up with a time constant of a couple microseconds. Then it settles down. If we stop it and restart soon, it's right on. But the longe...


ee's without math

Started by John Larkin in sci.electronics.design7 months ago 59 replies

https://cosmosmagazine.com/science/mathematics/ripple-effects-of-maths-crisis-spread-to-engineer ing/ (The aussies call it 'maths')

https://cosmosmagazine.com/science/mathematics/ripple-effects-of-maths-crisis-spread-to-engineer ing/ (The aussies call it 'maths')


explain the physics

Started by RichD in sci.electronics.design7 months ago 30 replies

https://www.youtube.com/watch?v=orx49fCw1lk -- Rich

https://www.youtube.com/watch?v=orx49fCw1lk -- Rich


current sink

Started by John Larkin in sci.electronics.design7 months ago 17 replies

I think this works. https://www.dropbox.com/scl/fi/kbfnta8idc9f8o3ww6zt6/Current_Sink_3.jpg?rlkey=06hl3vdh8eataurw8c f5l7dor&raw=1

I think this works. https://www.dropbox.com/scl/fi/kbfnta8idc9f8o3ww6zt6/Current_Sink_3.jpg?rlkey=06hl3vdh8eataurw8c f5l7dor&raw=1


opto shift register

Started by john larkin in sci.electronics.design7 months ago 32 replies

https://www.dropbox.com/scl/fi/weo0og6siaf5ano8thng3/Opto_Shift_Reg.jpg?rlkey=g170fs3jzg6zftzrrv r3phmd4&raw=1 A short low pulse shifts a 1 and...

https://www.dropbox.com/scl/fi/weo0og6siaf5ano8thng3/Opto_Shift_Reg.jpg?rlkey=g170fs3jzg6zftzrrv r3phmd4&raw=1 A short low pulse shifts a 1 and a long pulse shifts a 0.


Can I drive two inputs with one thermocouple

Started by Lamont Cranston in sci.electronics.design7 months ago 2 replies

NI 9213, thermocouple card, https://www.ni.com/docs/en-US/bundle/ni-9213-specs/page/specs.html It has 79MΩ differential input impedance. Is...

NI 9213, thermocouple card, https://www.ni.com/docs/en-US/bundle/ni-9213-specs/page/specs.html It has 79MΩ differential input impedance. Is there any reason I can't drive two cards with one k type thermocouple? Big mean angry guy says, "don't do it", I want to absolutely right before I hold my ground! I see it as a very low impedance driving two very high impedances.


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