Comment by periblepsis on Operational Amplifier Inputs
What's the goal in leaving the opamp open loop?
View ArticleComment by periblepsis on How is the sweep of duty cycle handled in common...
@Adam01 I have done it both ways: hardware and software. Some processors (by no means all) have invariant cycle-accurate delays into interrupt code (ADSP-21xx comes to mind) so you have no jitter at...
View ArticleComment by periblepsis on Why doesn't this LED work in this transistor circuit?
Maybe because the base of Q2 is half a volt (or more) more positive than the collector, and that this extra half volt (or more) is enough to make the difference in that simulation for whether it shows...
View ArticleComment by periblepsis on Are these old graphic controllers all the same die...
@tpimh Are you talking about this card that was used with the old IBM 5151 display? If so, just study that. The other later cards had to perform the same functions even if they may have done it with...
View ArticleComment by periblepsis on How to find the output and input impedance of a...
Where's the class-AB at?
View ArticleComment by periblepsis on Verilog Non-blocking and Blocking is logically...
I think it is nicely written. But there's a few subtle bits. One is that simulation \$\ne\$ synthesis. And the sheet starts out mentioning simulation and then heads over and shows a possible synthesis...
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Answer by periblepsis for How to calculate the value of resistor R2?
Here's how I'd process the problem, in order:There's no ground shown. Pick a node that looks good to me and call it \$0\:\text{V}\$ (or ground, so to speak.) In this case:Assign known node voltages...
View ArticleComment by periblepsis on How to read switch matrix with 74HC595
@vilmarci Unless you plan daisy-chaining more than one 74HC595 why not just use a decoder. I prefer the 7445. It's bullet-proof, can sink 80 mA and tolerate 30 V at its outputs. Four scan lines need...
View ArticleComment by periblepsis on Step-down, ultra-low current kVDC and boosting current
nothing, it reads as though your existing CC device can support several thousand volts of output compliance while maintaining 1 uA. This suggests a load on the order of GigOhms is required to...
View ArticleComment by periblepsis on CicuitMaker Project about a parking counter
So the assumption is that all entering cars go to the upper floor first, until it is filled up? Then how do you know which floor the car came from when leaving?
View ArticleComment by periblepsis on Voltage v2 seems to be opposite for equivalent circuit
The redraw sure looks wrong. Both (-) of the voltage sources are tied together in the redraw. Not so in the original.
View ArticleComment by periblepsis on Voltage v2 seems to be opposite for equivalent circuit
@weycdicdib The current source has zero impact on \$v_x\$. It cannot affect \$v_x\$. So you can get the voltage difference across \$R_2\$ without considering the current source.
View ArticleComment by periblepsis on superposition method to get the voltage
Just convert the current source and the 400 ohm resistor into its thevenin equivalent. Then all you have are three resistances sharing your node of interest, each driven by separate voltages.
View ArticleComment by periblepsis on 555 Monostable Mode Press and Hold Trigger
What you are looking for is something like the 74121. The 74121 includes a Schmitt-triggered input (which tolerates signals as slow as 1 V/s) and it completely ignores the input, once triggered, so the...
View ArticleComment by periblepsis on 555 Monostable Mode Press and Hold Trigger
@ErikVincent Good to hear! Best wishes.
View ArticleComment by periblepsis on How to minimize modulated signal clipping in an...
Rather than make us cull through these schematics, though we can do that if we have the time, why don't you instead save us a little time and talk about each and your methods in setting the DC...
View ArticleComment by periblepsis on Why can't I simplify this circuit in this way?
When you finally combined those last two resistor values, you destroyed Vo in the process. The node was removed when you series-combined the two remaining resistors.
View ArticleAnswer by periblepsis for BJT four-resistor bias circuit analysis, parallel...
Let me provide a different way of looking at it. It may be simpler to see your question with regard to \$R_1\$ and \$R_2\$ using math.Let's keep the BJT base current in place and assume that it is some...
View ArticleComment by periblepsis on LED lights in the house cause wicked static in my...
I'm no expert on FM, but I have some trouble imagining noise if the carrier is still present. FM over-amplifies and hard-limits. Without a carrier, sure, noise at the output of the demodulator is...
View ArticleComment by periblepsis on Could someone point me to a textbook or theory...
I was looking at some of my own early LED lamps and some recently purchased ones. The older circuits are more sophisticated. And today they overdrive them as, I believe, they pretty much want them to...
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