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spark plugs
inI 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?
inHi 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??
inActually, 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 ?
inI'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
inNCD2100 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
inhttps://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
inhttps://www.youtube.com/watch?v=orx49fCw1lk -- Rich
https://www.youtube.com/watch?v=orx49fCw1lk -- Rich
current sink
inI 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
inhttps://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
inNI 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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