Activity for Olin Lathrop
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #287400 |
Nice writeup (+1), but I can't let this go: *"some dysfunctionally written CRTs do not set-up fundamental things like watchdog and clock settings"*. There are reasons you don't want to use a watchdog timer, or need more control over the clock settings than can be explained to the CRT. Good CRT star... (more) |
— | over 2 years ago |
| Comment | Post #287366 |
You have been told this before. Your diagrams need to be neat and readable. Your first diagram is so out of focus that we can't even read some of the component designators. The others are so small that they are difficult to read. You could easily expand them to fill the 640 pixel width available ... (more) |
— | over 2 years ago |
| Edit | Post #287366 | Question closed | — | over 2 years ago |
| Comment | Post #287359 |
I suppose that's OK as long as those users do the managing and regular maintenance. If you create that as a paper, I won't get in the way. (more) |
— | over 2 years ago |
| Edit | Post #278602 |
Post edited: |
— | over 2 years ago |
| Edit | Post #287359 | Initial revision | — | over 2 years ago |
| Answer | — |
A: A community-maintained list of abbreviations used in electrical engineering? I was the one who started that list Elsewhere. I thought the same as you, that a few common abbreviations would be good to have in a single place. However, it quickly turned into a mess. After only a few days I could see it was a mistake. People added whatever obscure abbreviations they could... (more) |
— | over 2 years ago |
| Comment | Post #287211 |
@LvW: Reading that over I realize I wrote that poorly. My F is the reciprocal of your F. I have updated the post to hopefully describe that better. (more) |
— | over 2 years ago |
| Edit | Post #287211 |
Post edited: |
— | over 2 years ago |
| Comment | Post #287211 |
That's the same thing with F flipped. You can rearrange my equation to get Gain = G / (1+ G/F). I defined F as *"the fraction of the output fed back to the negative input"*. I suspect your reference defined F as the negative feedback gain. That's the reciprocal of what I used. Substitute this al... (more) |
— | over 2 years ago |
| Edit | Post #287258 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Buck-boost converter fed from split input supply One possibility is to use a transformer. The power input can then come from across the plus and minus input power. The output can be referenced to whatever you like, which in this case would be ground. The output current would always return to ground, so not effect the current balance between the ... (more) |
— | over 2 years ago |
| Edit | Post #287211 |
Post edited: |
— | over 2 years ago |
| Edit | Post #287211 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Low-pass filter after the output DAC in CD players I don't know what the book has in mind, but your first point is the main reason I would want to filter out the high frequencies with passive analog components. Low noise and low distortion are important in audio. It makes a real difference when the amplifier has to still have low noise and distor... (more) |
— | over 2 years ago |
| Edit | Post #287197 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Deriving resistor values for a taper pad attenuator I'm thinking out loud here and haven't solved this yet. This answer is logging my process as I try to solve the problem. It may very well result in the same long-winded process you went thru. Nothing shrewd or insightful is promised. There are three unknowns (R1, R2, R3), and there are fortunat... (more) |
— | over 2 years ago |
| Comment | Post #287196 |
Are Rin and Rl defined with the other end connected? For example, Rin must be right when a load is connected to the output, but can be different when the output is left open. The same question applies to the output impedance whether the input is connected or left open. I think you mean both input ... (more) |
— | over 2 years ago |
| Edit | Post #287029 |
Post edited: |
— | over 2 years ago |
| Comment | Post #287027 |
A Siemen is just 1/Ohm. Ohms is a measure of *resistance*, not resistivity. The reciprocal of Ohms is neither. An Ohm times a length is a measure of resistivity. Conversely, 1/(Ohm-length) is a measure of conductivity. Siemens must be divided by a length to become conductivity. µS/furlong is a ... (more) |
— | over 2 years ago |
| Edit | Post #287029 | Initial revision | — | over 2 years ago |
| Answer | — |
A: pH Electrode Buffer - Offset when solution grounded It seems you have ground loops, and possibly having multiple ground connections shorting out your signals. Your hand-sketched diagram is a good start, but you need to show all the ground connections. The scope is presumably grounded via its ground lug that plugs into the electrical outlet. Let's... (more) |
— | over 2 years ago |
| Comment | Post #287027 |
µS is not a measure of conductivity. Fix your units. (more) |
— | over 2 years ago |
| Comment | Post #286988 |
Close reason: Raw homework dump. Read the rules. (more) |
— | over 2 years ago |
| Edit | Post #286988 | Question closed | — | over 2 years ago |
| Edit | Post #286952 |
Post edited: |
— | almost 3 years ago |
| Edit | Post #286952 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: Technique to reset pulse transformer core quickly Note that open-circuiting an inductor "resets" the magnetic field instantly. The downside is that this also generates infinite voltage for that infinitely small time. Infinite voltage is obviously bad, but you should easily be able to tolerate "high enough" voltage relative to your 5 V drive. Us... (more) |
— | almost 3 years ago |
| Edit | Post #286946 |
Post edited: |
— | almost 3 years ago |
| Edit | Post #286946 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: Power amplifier for remote controller According to the datasheet that Andy linked to, the chip can be configured for 0 dBm output. With the proper antenna, that is probably good enough for 20 m, but you'll have to test it yourself to know for sure. If your environment is noisy, or there are obstructions causing path loss or multi-path ... (more) |
— | almost 3 years ago |
| Edit | Post #286938 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: Can confusing the plugs for earphones and microphones do any damage? Yes, plugging a microphone into a headphone output could possibly damage the microphone. Microphones are designed to work on tiny vibrations and tiny currents. A dynamic microphone will work backwards as a speaker, but at very low power. In any case, across all the various combinations of ouputs... (more) |
— | almost 3 years ago |
| Comment | Post #286862 |
I think you meant to say something else in the first bullet point. 180° phase shift already is an inversion. "180° inversion" doesn't make any sense either. (more) |
— | almost 3 years ago |
| Edit | Post #286864 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: Circuit which create ac sine wave from dc pulsed signal There is no "simple" circuit that does the reverse conversion of what a full wave bridge does on a sine wave. However, it is possible to get there from here. Most of what you are asking about is an inverter. That's the reverse of a DC power supply. You put DC in, and AC power comes out. Put ... (more) |
— | almost 3 years ago |
| Comment | Post #286850 |
This device is basically a 32-channel ohmmeter. It needs to measure about 75 Ω to 40 kΩ to within a couple of ohms. Zener leakage is too unpredictable and temperature-dependent to calibrate out.
In the mean time, I used a circuit like what Andy suggested. The overall device is worki... (more) |
— | almost 3 years ago |
| Comment | Post #286836 |
Closed. You were warned before. (more) |
— | almost 3 years ago |
| Edit | Post #286836 | Question closed | — | almost 3 years ago |
| Edit | Post #286841 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: What are the key programming skills for an embedded systems engineer? First, we have to clarify what you really mean by "embedded systems". There are many systems where something that is logically a PC is embedded. There is a whole industry around "single board computers" (SBCs). For a few 100 dollars, you can get a board that runs Windows or Linux, but is inten... (more) |
— | almost 3 years ago |
| Edit | Post #286793 |
Post edited: |
— | almost 3 years ago |
| Comment | Post #286793 |
I was referring to the opamp by itself. An ideal opamp in this case will have zero output impedance. I didn't mean that the zero output impedance is ideal for the rest of the circuit. In fact, I even pointed out how the inductor across the output is pointless in this circuit because the output of ... (more) |
— | almost 3 years ago |
| Comment | Post #286793 |
Oops. I meant to say high pass. Fixed. It should be doable without the resistor on the output of the oscillator. The right LC network can use the fixed input impedance of the inverting amplifier to control Q.
I'm not sure the OP is ready for these details yet. I haven't seen any evidence that ... (more) |
— | almost 3 years ago |
| Edit | Post #286793 |
Post edited: |
— | almost 3 years ago |
| Comment | Post #286792 |
You have been told this before. Use junction dots to show what intersecting schematic lines connect and which don't. For example, in the right diagram we can't tell whether only the bottom of L1 is connected to ground, or whether R1 and L2 also are. This is your last warning. (more) |
— | almost 3 years ago |
| Edit | Post #286793 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: Op Amp Hartley oscillator You are asking how to analyze this circuit: Forget about what you think it should be called. Before attempting to model specific aspects, first try to understand the circuit. The opamp provides gain of -R2/R1. For an ideal opamp, the output of the opamp has zero impedance in this circuit.... (more) |
— | almost 3 years ago |
| Comment | Post #286766 |
In Eagle you can make generic symbols that can be customized with "attributes", which are sortof like environment variables that are set in the device. The device is what binds a symbol to one or more packages, and is a container for higher level information above the packages and symbols. Maybe Al... (more) |
— | almost 3 years ago |
| Comment | Post #286745 |
Still no schematic. (more) |
— | almost 3 years ago |