Search found 75 matches

by cheapNdisgusting
Mon Oct 16, 2017 12:03 pm
Forum: General Discussion
Topic: Blinking red LED with a coin [button] cell
Replies: 6
Views: 1496

Re: Blinking red LED with a coin [button] cell

Yes I know - but that one(s) make sounds, don't last very long, and I just want to make it myself. :grin:
by cheapNdisgusting
Sun Oct 15, 2017 1:02 pm
Forum: General Discussion
Topic: Blinking red LED with a coin [button] cell
Replies: 6
Views: 1496

Re: Blinking red LED with a coin [button] cell

Thanks again dyarker, since this is still in the "brain-fart stage" the first attempt will probably go into a Tic Tac container [cut down] and filled with epoxy Just in case it falls off. I will hold it on with a double sided sticky tape.
When I get it de-bugged I will post a picture.
Thanks again.
by cheapNdisgusting
Sat Oct 14, 2017 11:11 am
Forum: General Discussion
Topic: Blinking red LED with a coin [button] cell
Replies: 6
Views: 1496

Re: Blinking red LED with a coin [button] cell

Thank you for your reply. As I mentioned in my original post - there is room for two (stacked) no more than 1/4" high total. I will solder them.
Thanks again.
by cheapNdisgusting
Sat Oct 14, 2017 6:31 am
Forum: General Discussion
Topic: Blinking red LED with a coin [button] cell
Replies: 6
Views: 1496

Blinking red LED with a coin [button] cell

Using an "off the shelf" red blinking 5mm LED [3v. 20 ma] and a small current limiting resistor controlled by a tilt switch (very simple so far) but since small size is very important I would like to power this with a coin cell [button cell] or two that are no larger than a quarter [25 cents] and no...
by cheapNdisgusting
Mon Dec 15, 2014 1:46 pm
Forum: Reader Projects
Topic: I need help on using a transistor as a switch.
Replies: 5
Views: 3708

Re: I need help on using a transistor as a switch.

dyarker I tried both of your suguestions and both were correct. Option A - the gain was too low (exactly as you said) and it took touching the probes together to actually turn on Q3.

Then I did option B and it works perfectly.

Thanks again for the help. Much appreciated.

cNd
by cheapNdisgusting
Mon Dec 15, 2014 7:02 am
Forum: Reader Projects
Topic: I need help on using a transistor as a switch.
Replies: 5
Views: 3708

Re: I need help on using a transistor as a switch.

Thanks Dyarker for the info. I appreciate how in-depth you explained it.
by cheapNdisgusting
Sun Dec 14, 2014 6:00 pm
Forum: Reader Projects
Topic: I need help on using a transistor as a switch.
Replies: 5
Views: 3708

I need help on using a transistor as a switch.

fishclicker.jpg I've made several of these and they are called "fish callers". 9 volt battery operated, Put it in a sealed waterproof container like a pill bottle, add enough weight to cause it to sink, and with a string tied to it - drop it in and I can pull it back up. Works OK (didn't say great ...
by cheapNdisgusting
Wed Oct 29, 2014 6:58 am
Forum: General Discussion
Topic: Rare earth magnet and a 9 volt battery
Replies: 14
Views: 3449

Re: Rare earth magnet and a 9 volt battery

Duct tape and plastic film?
by cheapNdisgusting
Sun Oct 19, 2014 6:47 am
Forum: General Discussion
Topic: 3V circuits.......
Replies: 6
Views: 1194

Re: 3V circuits.......

They are expensive but Lithium batteries should perform much longer.
by cheapNdisgusting
Thu Oct 16, 2014 9:23 am
Forum: General Discussion
Topic: Rare earth magnet and a 9 volt battery
Replies: 14
Views: 3449

Re: Rare earth magnet and a 9 volt battery

OK, I just performed an extremely unscientific experiment. I just took two identical circuits with a 555 [astable mode] driving a 4017 decade counter/divider which in turn flashed [one at a time] 10 superbright LEDs. The flash rate was about 2 per second. Two new 9 volt batteries out of the same pac...
by cheapNdisgusting
Sun Oct 12, 2014 8:22 am
Forum: General Discussion
Topic: Rare earth magnet and a 9 volt battery
Replies: 14
Views: 3449

Re: Rare earth magnet and a 9 volt battery

Thanks for the replies. I am going to go out on a limb here and draw a conclusion that has a 50/50 chance of being correct. Current problem: Whether to use Velcro or a rare earth magnet to secure a 9 volt battery in a hobby project built with parts that are + or - 5% to 10% within the specifications...
by cheapNdisgusting
Sat Oct 11, 2014 6:45 am
Forum: General Discussion
Topic: Rare earth magnet and a 9 volt battery
Replies: 14
Views: 3449

Re: Rare earth magnet and a 9 volt battery

Tzap - thanks for the reply. I read the PDF and understood about half of it. LOL

I will do some "pondering" on it because I'm not sure what I just read. :???:
by cheapNdisgusting
Fri Oct 10, 2014 6:17 pm
Forum: General Discussion
Topic: Rare earth magnet and a 9 volt battery
Replies: 14
Views: 3449

Re: Rare earth magnet and a 9 volt battery

Thanks for your input hacklesup - I think I will try it.
by cheapNdisgusting
Fri Oct 10, 2014 3:01 pm
Forum: General Discussion
Topic: Rare earth magnet and a 9 volt battery
Replies: 14
Views: 3449

Rare earth magnet and a 9 volt battery

I'm working on a project with LEDs, 555 timers, resistors, and a couple caps. It will be powered by a 9 volt battery. Does anyone know if a rare earth magnet can be used to hold the battery in place? I know it will hold it - but will the magnet affect the battery life? It will require a battery chan...
by cheapNdisgusting
Fri Nov 08, 2013 5:57 am
Forum: General Discussion
Topic: Some transistor identification help needed.
Replies: 3
Views: 957

Re: Some transistor identification help needed.

I made a mistake when trying to explain the circuit. I should have called it a Transistor shaped device. After considering that the entire dehydrator operated on 120vac that it obviously had to be a Triac.