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| bio | website | |
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| location | ||
| age | 48 | |
| visits | member for | 2 years, 7 months |
| seen | 12 mins ago | |
| stats | profile views | 124 |
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Oct 30 |
awarded | Popular Question |
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Sep 30 |
awarded | Yearling |
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Sep 6 |
awarded | Popular Question |
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Apr 30 |
awarded | Popular Question |
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Mar 27 |
accepted | How do I invert the output of this current sensor using the other side of the LM358? |
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Mar 24 |
comment |
Functional difference between various astable 555 circuits How are you planning to adjust the PWM output? Both of these 555 PWM circuits rely on using a potentiometer to vary the duty cycle. Will that work for you? |
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Mar 23 |
comment |
Functional difference between various astable 555 circuits @Andrew: You could use a 556 (dual-555) chip, and use one of the timers in the traditional astable configuration to clock the other in the PWM configuration. |
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Mar 21 |
comment |
How do I invert the output of this current sensor using the other side of the LM358? Okay, by tweaking the resistances as suggested I was able to get something relatively close... The resulting LOAD_SENSE curve looks like it tries to move rail-to-rail, but of course it can only get within about 1V with the LM358. The other problem is that it either lags following the current rise or it bottoms out before the peak current is reached (or both), again depending on the exact resistance values I try. This is all probably fix-able with a rail-to-rail OpAmp, as suggested. But I still wonder if there is a way with the LM358 (as I have those handy)? |
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Mar 21 |
revised |
How do I invert the output of this current sensor using the other side of the LM358? Attached simulation output for suggested circuit. |
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Mar 20 |
comment |
How do I invert the output of this current sensor using the other side of the LM358? I edited this question yesterday to attach simulation results for this proposed circuit, but apparently the edited version needs "peer review" before it becomes visible to anyone else. The summary is, the output of this circuit ramps down from its high as soon as there is any current flowing. Substituting an ideal op-amp for the LM358 changes the voltages somewhat but not the behavior / curve. |
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Mar 20 |
accepted | Regulating a steam-powered model generator |
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Mar 20 |
comment |
Regulating a steam-powered model generator Repeating an explanatory comment from below: As this is for a model steam locomotive, the goal is to keep the design as simple and bullet-proof as possible. When I raised the possibility of regulating the steam pressure with a closed-loop solenoid mechanism the response was simply: No. The operator adjusts a "throttle" attached to the line feeding the turbine to achieve a desired set-point (I believe based on the sound!) and that is considered a feature. :-) |
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Mar 19 |
suggested | suggested edit on How do I invert the output of this current sensor using the other side of the LM358? |
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Mar 19 |
revised |
How do I invert the output of this current sensor using the other side of the LM358? added 378 characters in body |
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Mar 19 |
comment |
How do I invert the output of this current sensor using the other side of the LM358? @abdullahkahraman: In the simulation, that gives 10V output when there's no current flowing and drops instantly to 0V when there's even the smallest current. |
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Mar 19 |
asked | How do I invert the output of this current sensor using the other side of the LM358? |
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Mar 16 |
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Regulating a steam-powered model generator I haven't really seen transistors used to dissipate power before. Are there really power transistors capable of continuously dissipating 50W? |
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Mar 15 |
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Regulating a steam-powered model generator To clarify (I hope), the pressure of the steam input to the turbine is set once by the operator. With no output regulation, the speed of the turbine varies as the electrical load varies. What is desired is that the speed of the turbine remain constant without adjusting the input pressure. So, presenting the generator with a constant load seems to be the only recourse. |
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Mar 15 |
comment |
Regulating a steam-powered model generator So basically a switching power supply design? This sounds do-able, but I can't help thinking there must be a more primitive circuit that could do the job. |
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Mar 15 |
comment |
Regulating a steam-powered model generator As this is for a model steam locomotive, the goal is to keep the design as simple and bullet-proof as possible. When I raised the possibility of regulating the steam pressure with a closed-loop solenoid mechanism the response was simply: No. The operator adjusts a "throttle" attached to the line feeding the turbine to achieve a desired set-point (I believe based on the sound!) and that is considered a feature. :-) |
