Search found 1564 matches

by dyarker
Tue Apr 16, 2019 6:52 pm
Forum: General Discussion
Topic: Having a problem with a triac
Replies: 10
Views: 2554

Re: Having a problem with a triac

Triggering on both half cycles? (positive and negative) Triggering on only one will cut by half. Every pass through zero turns TRIAC off.

Cheers,
by dyarker
Tue Apr 16, 2019 8:05 am
Forum: General Discussion
Topic: Having a problem with a triac
Replies: 10
Views: 2554

Re: Having a problem with a triac

With 12VAC applied, what do you expect the result to be?
by dyarker
Wed Mar 13, 2019 4:09 am
Forum: General Discussion
Topic: Any integrated circuit that works as the old tone decoder but for RF ?
Replies: 7
Views: 2497

Re: Any integrated circuit that works as the old tone decoder but for RF ?

haklesup, make that 2.4GHz for Wi-Fi.

Cheers,

Also, 118MHZ to 137MHz is for air traffic control.
by dyarker
Mon Feb 18, 2019 9:55 am
Forum: General Discussion
Topic: Odd Commercial Products.........
Replies: 95
Views: 21760

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

Yes.

Either way, but you clean it afterwards :grin:
by dyarker
Sat Feb 09, 2019 4:57 am
Forum: Computer Programming
Topic: Cross Page Posting
Replies: 2
Views: 1312

Re: Cross Page Posting

I do not know.

But cross section posting would be, for example, asking the same question here in Computer Programming and in General Discussion sections.

Cheers,
by dyarker
Fri Feb 08, 2019 4:21 am
Forum: General Discussion
Topic: surge voltages
Replies: 11
Views: 2786

Re: surge voltages

Some indication of size? Voltage and current of load being protected?

ie. a computer and printer - a surge protection power outlet strip around $10 at (like) Home Depot or Lowe's
Or an UPS from (maybe like) Best Buy

Cheers,
by dyarker
Wed Jan 23, 2019 4:53 am
Forum: Reader Projects
Topic: Reel for lowering a sensor
Replies: 7
Views: 11139

Re: Reel for lowering a sensor

Lets say 4in diameter spool so we don't bend wire rope too sharply. 4in * 3.141 = 12.5in circumference 10m * 39.37 in per m = 393.7in 393.7in / 12.5 in per turn = 31.5 turns 31.5 turns * 0.125in rope diameter = 4in spool width 'Or - A 4in diameter spool 2in wide with sides more than 1/4in high. Now ...
by dyarker
Tue Jan 22, 2019 11:18 am
Forum: Reader Projects
Topic: Reel for lowering a sensor
Replies: 7
Views: 11139

Re: Reel for lowering a sensor

size of line and/or cable?
by dyarker
Thu Jan 10, 2019 7:48 pm
Forum: General Discussion
Topic: Something Wrong with Coupling Capacitor
Replies: 10
Views: 7350

Re: Something Wrong with Coupling Capacitor

Series capacitors have less combined capacitance, not more. Two same value capactors in series are half the capacitance of one.

The amount of effect on bass depends on capacitance, source and load impedances.
by dyarker
Thu Jan 10, 2019 12:45 pm
Forum: General Discussion
Topic: Something Wrong with Coupling Capacitor
Replies: 10
Views: 7350

Re: Something Wrong with Coupling Capacitor

With 5532 I find a TV tuner and a pre-amp IC. Your description sounds more like a radio tuner (with maybe a 5532 on board?), that would make the setup stereo and there would two coupling capacitors between each stage, one for left and one for right. With separate boards each could have capacitors on...
by dyarker
Fri Dec 21, 2018 3:58 am
Forum: General Discussion
Topic: Resistor Color Codes
Replies: 9
Views: 1803

Re: Resistor Color Codes

Haklesup, I wasn't being short with you. I had just lost the longer answer down the black hole of pressing submit. The link you gave does use the phase "color codes obsolete", then proves they are not. In more and more electronics in the world SMT (which does not use color code) is used. So less per...
by dyarker
Thu Dec 20, 2018 1:03 pm
Forum: General Discussion
Topic: Resistor Color Codes
Replies: 9
Views: 1803

Re: Resistor Color Codes

Dirty word, longer answer disappeared.

No not obsolete!
by dyarker
Thu Dec 20, 2018 4:46 am
Forum: General Discussion
Topic: Resistor Color Codes
Replies: 9
Views: 1803

Re: Resistor Color Codes

I don't like the explanation at the link you gave either. try - https://en.wikipedia.org/wiki/Resistor_color_code#Resistor_color-coding The space between color stripes is not important; but the really wide gap separates the value stripe from the tolerance and temperature coefficient stripes. The fir...
by dyarker
Sat Dec 01, 2018 7:07 am
Forum: General Discussion
Topic: need help to find blue led bulb
Replies: 17
Views: 2332

Re: need help to find blue led bulb

I guess you never looked at an LED spec sheet either! LED Reverse voltage 5V PERIOD! LED "bulbs" would have a diode and current limiting (probably not resistor) built in. Dacflyer is not looking for a single blue LED "bulb" at 120VAC. According to link he wants equivelent light to 10W incandescent i...
by dyarker
Fri Nov 30, 2018 1:18 pm
Forum: General Discussion
Topic: need help to find blue led bulb
Replies: 17
Views: 2332

Re: need help to find blue led bulb

Additional- A resistor's power rating is based on it's max power in free air which is at 25°C. Your calculation for 5mA was still 0.6W. Inside the base and bulb is not free air, it is not 25°C, and the resistor is not alone. So with thermal conductive epoxy (to move heat to metal shell) it might get...