Hobby Electronics Basics

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Purpose of cap on ac line of PC power supply

I am re-purposing a PC power supply and there is a "0.47k" cap across the incoming AC line. What's that for?
5 comments posted 7yrs
posted by BobEngelhardt
5 comments posted 7yrs posted by BobEngelhardt

Better electrical connectors

I have been using the blade type male/female electrical connectors, but there are a little klunky in connecting up. Is...
1 comments posted 7yrs
posted by scientist77017
1 comments posted 7yrs posted by scientist77017

Laser alarm

I was looking at this. "https://blog.prayogindia.in/make-laser-light-security-alarm/" Would this be an acceptable LDR?....
8 comments posted 7yrs
posted by scientist77017
8 comments posted 7yrs posted by scientist77017

Remove some leds

I would like to reduce the light output of this nightlight by removing two of the leds. "https://www.dropbox.com/s/nd0m...
14 comments posted 7yrs
posted by scientist77017
14 comments posted 7yrs posted by scientist77017

Electronic parts sites

I am looking for sites that sell electronic components. I have Jameco, but they don't have a lot of components. Thanks,...
5 comments posted 7yrs
posted by scientist77017
5 comments posted 7yrs posted by scientist77017

Generating this negative pulse?

I have a couple of simple 555 monostables, the first to delay the triggering of the second. https://www.dropbox.com/s/6...
15 comments posted 7yrs
posted by me
15 comments posted 7yrs posted by me

Run time for leds

I have (8) 5 watt leds that are run from a 12VDC source. (3 18650 batteries at 3000 Ma hrs each. I want to know the appr...
20 comments posted 7yrs
posted by scientist77017
20 comments posted 7yrs posted by scientist77017

Re: How do you recycle solar panels?

>> >>> >>> How do you recycle solar panels? Without any pollution? >>> >> >> You send them to China. > > > AND... > > I...
1 comments posted 7yrs
posted by looking
1 comments posted 7yrs posted by looking

Spurious triggering of 4013 flip-flop

One of my garden lamp circuits is shown here: https://www.dropbox.com/s/10cc6lwfrsqjp68/DiningLamp-Post.jpg?raw=1 But t...
55 comments posted 7yrs
posted by me
55 comments posted 7yrs posted by me

cmos IC question

I'm using some cmos IC gates in a project. All seem to have an internal protection network to insure that the inputs ca...
18 comments posted 7yrs
posted by default
18 comments posted 7yrs posted by default

Switch mystery

As you can see in the picture, the switch is set to the off position. When I test the continuity, there is no beep. How...
6 comments posted 7yrs
posted by scientist77017
6 comments posted 7yrs posted by scientist77017

Re: Sanity check on simple optocoupler use

2017EA6C0B929975CCA72C43 > Content-Type: text/plain; charset=utf-8; format=flowed > Content-Transfer-Encoding: 7bit > >...
1 comments posted 7yrs
posted by jasen
1 comments posted 7yrs posted by jasen

NiMH batteries

I bought some EBL aaa nimh batteries. Voltage is 1.3 v. Does that mean they are already fully charged? Andy
2 comments posted 7yrs
posted by scientist77017
2 comments posted 7yrs posted by scientist77017