Search found 1549 matches

by CeaSaR
Sun Oct 27, 2019 6:27 am
Forum: General Discussion
Topic: I can't think today.. help !
Replies: 10
Views: 2894

Re: I can't think today.. help !

Did that ever work?
If it did, what was your final design?
by CeaSaR
Fri Oct 04, 2019 7:47 pm
Forum: General Discussion
Topic: laser level offset measurement
Replies: 3
Views: 195

Re: laser level offset measurement

Land surveying is my profession. What you sound like you are saying is that you want to use a contractor's rotating laser level, something like this: https://www.amazon.com/Johnson-Level-Tool-99-005K-Manual-Leveling/dp/B00ME77KH8 and you want to build a logger that can be triggered by the laser in a...
by CeaSaR
Thu Sep 26, 2019 8:29 am
Forum: General Discussion
Topic: Self entertaining, entertainment system!
Replies: 29
Views: 3216

Re: Self entertaining, entertainment system!

Sounds like a poor design or actual design flaw with said remote. What brand was it, if I may ask?
by CeaSaR
Wed Sep 25, 2019 5:31 pm
Forum: General Discussion
Topic: Self entertaining, entertainment system!
Replies: 29
Views: 3216

Re: Self entertaining, entertainment system!

The thing with the Cell ping is that it usually only affects poorly shielded input cables nearby. If the ping would cause interference of the kind that is intimated, there would be serious problems with their FCC compliance, moreso with the TV than the phone. The standard cell ping has been around f...
by CeaSaR
Wed Sep 18, 2019 8:31 pm
Forum: General Discussion
Topic: Voltage spike
Replies: 9
Views: 317

Re: Voltage spike

You've got AC and an almost direct line from the transformer to the base(s) of the Darlington transistors. When you remove power from the transformer, the collapsing magnetic field(s) can cause a large inductive spike depending where it is on the waveform. If it is at the top of the waveform instead...
by CeaSaR
Tue Sep 17, 2019 6:29 pm
Forum: General Discussion
Topic: Voltage spike
Replies: 9
Views: 317

Re: Voltage spike

From your description, it sounds like a home-brew power supply. Would you be able to provide at least a partial schematic of the transformer to the initial output stage of the PS? If commercial, a make and model would be helpful. Kind of a shot in the dark without some info, though I have an inkling...
by CeaSaR
Mon Sep 16, 2019 6:40 pm
Forum: General Discussion
Topic: Can anyone help this fellow experimenter?
Replies: 2
Views: 179

Re: Can anyone help this fellow experimenter?

Here's the guy's question: ****** James Analytic 2 days ago Great write up. I was wondering about the current waveform and using an inductor say for higher current applications like welding in the same way the capacitor is used. Is there a similar formula like how the capacitor is used to filter and...
by CeaSaR
Sun Sep 08, 2019 6:38 am
Forum: General Discussion
Topic: Odd Commercial Products.........
Replies: 95
Views: 13717

Re: Odd Commercial Products.........

At first I thought you meant Muzo, but it's yet another one.
Here's a review of Muzo: https://youtu.be/MCW5HUkrr-o

At least the moles and gophers won't be in their walls.
https://www.cleanairgardening.com/solar ... repellent/

CeaSaR
by CeaSaR
Mon Aug 12, 2019 8:34 am
Forum: General Discussion
Topic: I can't think today.. help !
Replies: 10
Views: 2894

Re: I can't think today.. help !

Yep, but it retains some resistance to ground because the LED resistor stays in circuit to prevent overloading the output. Since the signal to turn on is taken from the next step up, it'll turn the lower one off, and as the voltage increases, the lower outputs stay active, continuing to shunt the LE...
by CeaSaR
Sun Aug 11, 2019 9:08 pm
Forum: Computer Programming
Topic: server fan diagram
Replies: 5
Views: 1245

Re: server fan diagram

Only thing I can find is via Digikey:
https://www.digikey.com/product-detail/ ... -ND/665856
by CeaSaR
Fri Aug 09, 2019 4:27 pm
Forum: General Discussion
Topic: I can't think today.. help !
Replies: 10
Views: 2894

Re: I can't think today.. help !

Go back to the "ok, new project time" thread ( https://forum.nutsvolts.com/viewtopic.php?f=45&t=17714 ) and look at the LM 324 circuit. Just use 1/2 of the shown circuit, but insert a NPN transistor and possibly a resistor as a switched path to ground, effectively grounding the input to the led. Her...
by CeaSaR
Fri Jun 14, 2019 7:44 pm
Forum: General Discussion
Topic: Mini amp circuit
Replies: 147
Views: 233023

Re: Mini amp circuit

It's based on the old style Quasi-Complentary AB amps of old when high power PNP transistors were rare. Yes, I could use lovely modern units and not go that route, but, nostalgia, ya know. It all works out in the end.

I was just trying to figure out why it looked like that.
by CeaSaR
Fri Jun 14, 2019 6:14 am
Forum: General Discussion
Topic: Mini amp circuit
Replies: 147
Views: 233023

Re: Mini amp circuit

I think I see why I get that reading. Mostly they are used with a split power supply and a GND point between them. Thus, in this particular case, the negative transistor (PNP) never really has the chance to go more negative than the ground reference point.
by CeaSaR
Thu Jun 13, 2019 6:34 pm
Forum: General Discussion
Topic: Mini amp circuit
Replies: 147
Views: 233023

Re: Mini amp circuit

Well, it's ten years later and I have a question about this and many other very similar circuits. Being that this type of circuit is class AB, wherein the B section is supposed to split the amplified signal in half, with each respective transistor amplifying their respective polarity of the wave for...
by CeaSaR
Fri Jun 07, 2019 6:41 pm
Forum: Computer Programming
Topic: Router issue ( boot loop ) keeps resetting.
Replies: 7
Views: 1588

Re: Router issue ( boot loop ) keeps resetting.

What's the TIMEOUT set to? It may need to be increased. Were there any updates that may have caused the problem? For all you know, it may be on your internet provider's end in that they may not be 100% compatible with your router. My Story: Way back when my kids were in school, we were not happy wit...