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Type: Posts; User: schmitt trigger

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1. ## Thread: would an engineer use this equation?

by schmitt trigger
Replies
7
Views
189

### Closed: Re: would an engineer use this equation?

ONLY as a preliminary estimate, yes.
The temperature rise will have to be measured with worst case conditions.
2. ## Thread: Filter topology anyone knows

by schmitt trigger
Replies
3
Views
230

### Closed: Re: Filter topology anyone knows

Ckicking the attachment gives an "Invalid Attachment" error
3. ## Thread: how to boost microvolts to higher voltages?

by schmitt trigger
Replies
68
Views
1,641

### Closed: Re: how to boost microvolts to higher voltages?

Audioguru did in the previous post.
4. ## Thread: Electronic version of the German Enigma machine

by schmitt trigger
Replies
4
Views
996

### Closed: Re: Electronic version of the German Enigma machine

And not only the enigma machine, but some key parts of crashed V2 rockets were also retrieved by the Poles.
5. ## Thread: how to boost microvolts to higher voltages?

by schmitt trigger
Replies
68
Views
1,641

### Closed: Re: how to boost microvolts to higher voltages?

@d109, I'm going to give you a sincere advice;

if you are planning to go into electronics, as a profession or as a hobby, one very important skill set is to learn to draw understandable...
6. ## Thread: Circuit to capture the motor inrush current

by schmitt trigger
Replies
3
Views
222

### Closed: Re: Circuit to capture the motor inrush current

A schematic showing boxes identified only with numbers or letters, is not an useful schematic.
The cable distances 200+/-50, what are the units? Millimeters? Feet? Kilometers?

A wideband current...
7. ## Thread: how to boost microvolts to higher voltages?

by schmitt trigger
Replies
68
Views
1,641

### Closed: Re: how to boost microvolts to higher voltages?

To boost a signal with those ultra-low input levels, a high common-mode rejection will be required most certainly.

That suggests a full-differential amplifier.
8. ## Thread: How to wind toroidal coils?

by schmitt trigger
Replies
7
Views
346

### Closed: Re: How to wind toroidal coils?

Copper tape, for sure.
For a given cross-sectional area, its thickness is significantly thinner.

It may not hold as well to the core as plain round wire, however.
9. ## Thread: 3-phase Δ-connected 11kV Open Circuit Fault Detection?

by schmitt trigger
Replies
8
Views
317

### Closed: Re: 3-phase Δ-connected 11kV Open Circuit Fault Detection?

11 kV with no neutral and "cheap" don't belong together.

My personal opinion is to follow the suggestion outlined by Brian.
Use ONLY current transformers with the creep and insulation ratings...
10. ## Thread: Who has experience using tube...

by schmitt trigger
Replies
10
Views
1,210

### Closed: Re: Who has experience using tube...

I like tubes, for purely nostalgia reasons.

A particular problem for preamp tubes, specially in high gain stages, is that poor quality devices may not have been fully evacuated, and the residual...
11. ## Thread: Charge injection in chopper-stabilized opamps.

by schmitt trigger
Replies
2
Views
179

### Closed: Re: Charge injection in chopper-stabilized opamps.

Indeed, another solution advocated in many data sheets is to use a capacitor in parallel with the feedback resistors to create a low pass filter.

Haven't attempted it yet, though.
12. ## Thread: Old capacitor needs replacing not sure what to replace with.

by schmitt trigger
Replies
15
Views
1,071

### Closed: Re: Old capacitor needs replacing not sure what to replace with.

I am with Brian, that MOST LIKELY the rating is not 25VAC, but 250 VAC.

What happened to the wire insulation? And the loose wire strands in the bottom left corner?
That looks like an accident...
13. ## Thread: Charge injection in chopper-stabilized opamps.

by schmitt trigger
Replies
2
Views
179

### Closed: Charge injection in chopper-stabilized opamps.

Rather than hi-jacking the thread "Precision op amps - is 1 microvolt offset believable?", I decided to open a new topic.

14. ## Thread: Auto oscillating DC-DC converter

by schmitt trigger
Replies
4
Views
428

### [SOLVED]Closed: Re: Auto oscillating DC-DC converter

These types of converters were once ubiquitous in compact cameras to transform the voltage from a pair of AA cells to the high voltage required by a xenon flash tube.

When you turned the flash on,...
15. ## Thread: Step Cieling fan regulator using Triac

by schmitt trigger
Replies
6
Views
473

### Closed: Re: Step Cieling fan regulator using Triac

What is your control sequence: 1= low, 2= medium, 3= high, 4= full?
Do you open one Triac first before closing the other Triac?

I am sure that you already checked them, but for our benefit: What...
16. ## Thread: 230VAC PWM LED bulb dimmer

by schmitt trigger
Replies
38
Views
1,804

### Closed: Re: 230VAC PWM LED bulb dimmer

Dimmable LED lamp drivers are designed to work with phase control! Not with free-running PWM!

The snap that you mention is corrected with a double time constant Triac trigger circuit. Check...
17. ## Thread: Feedback less PushPull Converter

by schmitt trigger
Replies
6
Views
496

### Closed: Re: Feedback less PushPull Converter

You need a bare-minimum type of feedback.

Something that I have seen, for very low cost applications, is an on-off feedback.

Essentially, you run the push pull at maximum (50-50) duty cycle. On...
18. ## Thread: 230VAC PWM LED bulb dimmer

by schmitt trigger
Replies
38
Views
1,804

### Closed: Re: 230VAC PWM LED bulb dimmer

You can't dim with PWM a device which is connected to the power line.

You do phase control.
In its simplest terms, you synchronize to the zero crossing and delay the triggering a few...
19. ## Thread: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation needed

by schmitt trigger
Replies
18
Views
979

### Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

Have you tested *several samples* under different load, line and temperature conditions, and validate that there is no condition which would cause current hogging and/or another anomalous behavior?
20. ## Thread: Wht is the purpose of this op amp

by schmitt trigger
Replies
8
Views
728

### Closed: Re: Wht is the purpose of this op amp

It is a simple voltage follower configuration.

In my opinion, if one is going to use an opamp anyways, it is better to implement with it a higher order filter.
Far less ripple for a given cutoff...
21. ## Thread: Frequency Generator XR-2206 PCB Design Missing Components

by schmitt trigger
Replies
5
Views
919

### Closed: Re: Frequency Generator XR-2206 PCB Design Missing Components

One question:
Do you have a schematic for your project?

This is a very important question. Blindly copying a layout without the benefit of a schematic netlist, a mistake is very likely.
22. ## Thread: Easiest way to get 5v and ~1V

by schmitt trigger
Replies
20
Views
1,310

### Closed: Re: Easiest way to get 5v and ~1V

+1 What Klaus just mentioned.

Before the advent of rail to rail opamps, one had to procure a negative supply, a big hassle for battery operated products.

Nowadays, with the proliferation of R2R...
23. ## Thread: Project using Opamps-intermediate level

by schmitt trigger
Replies
11
Views
1,371

### Closed: Re: Project using Opamps-intermediate level

A graphic audio equalizer.
24. ## Thread: Trouble with frying 74LS11N AND Gate

by schmitt trigger
Replies
7
Views
715

### [SOLVED]Closed: Re: Trouble with frying 74LS11N AND Gate

The 74LS11 IC is a triple, 3 input AND gate.

What are you doing with the inputs of the two other unused gates?
25. ## Thread: Does It Make Sense to Connect SMD Fuses In Parallel Instead of Using Bigger One

by schmitt trigger
Replies
3
Views
419

### Closed: Re: Does It Make Sense to Connect SMD Fuses In Parallel Instead of Using Bigger One

Additionally, it will cost 3 times as much.
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