Search found 1541 matches

by CeaSaR
Mon Aug 12, 2019 8:34 am
Forum: General Discussion
Topic: I can't think today.. help !
Replies: 8
Views: 1310

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: 338

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: 8
Views: 1310

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: 210113

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: 210113

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: 210113

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: 1399

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...
by CeaSaR
Wed Jun 05, 2019 8:06 pm
Forum: General Discussion
Topic: Something Wrong with Coupling Capacitor
Replies: 10
Views: 2082

Re: Something Wrong with Coupling Capacitor

These boards are designed to basically be "plug and play" and should work right out of the box. Are you trying to use it in a manner that is not described in the included paperwork? Again, is there a schematic or at least a link to the board you have purchased? Just how are you going to use the boar...
by CeaSaR
Wed Jun 05, 2019 6:45 pm
Forum: Computer Programming
Topic: Router issue ( boot loop ) keeps resetting.
Replies: 7
Views: 1399

Re: Router issue ( boot loop ) keeps resetting.

I see you can use the old router just fine, so it's not necessarily the Internet connection. (That's another story that I think I told a long while back) Did you try to connect to the Amped router with other devices to rule out the main connected device? Can you connect to the Amped device without i...
by CeaSaR
Sat May 18, 2019 6:23 pm
Forum: Computer Programming
Topic: Help with Microsoft word 2000
Replies: 10
Views: 975

Re: Help with Microsoft word 2000

That is not normal behavior. Even if you have an existing file, the popup would be the Overwrite/Replace question. Have there been updates or have you had to log-in just before this started? Is it possible that Word was installed as Administrator only and you are not on the Administrator account? Is...
by CeaSaR
Mon May 13, 2019 7:30 pm
Forum: General Discussion
Topic: CNC Router anyone?
Replies: 5
Views: 1365

Re: CNC Router anyone?

Funny you should bring this up. In the transfer of files from the old laptop to get info for my oldest to get into design, I grabbed all my old bookmarks and there were quite a few related to CAD / CAM stuff that were for some sort of CNC or vinyl cutting, etc. Back in the day, I was able to write H...
by CeaSaR
Sat May 11, 2019 8:44 am
Forum: General Discussion
Topic: [18650] rechargeable battery + super capacitor
Replies: 7
Views: 1422

Re: [18650] rechargeable battery + super capacitor

Being as you are using a MC (the Raspberry Pi Zero), you can either include a battery voltage monitor routine that automatically puts the MC into low power / sleep mode, or a button push that would do the same. Once that is done, you can use a smaller capacitor since the drain will be greatly reduce...
by CeaSaR
Sat May 11, 2019 8:34 am
Forum: General Discussion
Topic: Gain block question
Replies: 1
Views: 1083

Gain block question

Here I go again, another wierd discrete component audio query. Still in the audio reproduction mode (it's my main electronic interest ;) ) and this time I'm trying to understand how the "volume control" on the PSAudio amps work. Paul (the P in PSAudio) says that they use gain blocks for their volume...
by CeaSaR
Sat May 11, 2019 7:44 am
Forum: General Discussion
Topic: CNC Router anyone?
Replies: 5
Views: 1365

Re: CNC Router anyone?

Well, I would comment, but I don't have a CNC machine. Always wanted one...
by CeaSaR
Mon Apr 29, 2019 1:17 pm
Forum: General Discussion
Topic: Death Rattle?
Replies: 8
Views: 2033

Re: Death Rattle?

Thanks Sean. Hopefully we'll see a few new people soon.