Hobby Electronics Basics

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Flashing LEDs - 9V

Hi I want to build a very simple circuit to alternately flash 2 high power LEDs - the sort you get in cycle lights. I h...
4 comments posted 20yrs
posted by neil
4 comments posted 20yrs posted by neil

can telephone noise dial 911?

A couple of weeks back I had a couple of police officers knocking on my door saying someone had placed a 911 call from...
24 comments posted 20yrs
posted by davegow.removethis.
24 comments posted 20yrs posted by davegow.removethis.

Replacing crystal with external clock signal

I have a chip that wants a specific low-frequency (38k) clock crystal, which are somewhat hard to find and pricy. I cou...
4 comments posted 20yrs
posted by petafrog
4 comments posted 20yrs posted by petafrog

keyboards

I seem to go through keyboard like its candy. Almost always its because I spill something on them(and even those anti-s...
37 comments posted 20yrs
posted by Jon_Slaughter
37 comments posted 20yrs posted by Jon_Slaughter

Bluetooth + Sport of Fencing

What I'm looking for is someone who can point me at some resources or maybe some similar projects. What I've got is the...
2 comments posted 20yrs
posted by will.read
2 comments posted 20yrs posted by will.read

building an electric bell-ringer

Just starting out as a hobbyist in this great field...!! For whatever reason, I missed out on a lot when I was a boy, s...
3 comments posted 20yrs
posted by rawbeginner
3 comments posted 20yrs posted by rawbeginner

Transformer lead color

I found a power transformer in my garage which I need to use. Primary wires are black. On the other side it has 2 red w...
7 comments posted 20yrs
posted by perilmung
7 comments posted 20yrs posted by perilmung

Diac

Wht is meaning of Diac? Where it is used?
3 comments posted 20yrs
posted by wazdesign
3 comments posted 20yrs posted by wazdesign

LCD Help Please

Hi, I've picked up a sonar fish finder which features a square lcd screen which is about 9cm2 big. As I've got an inter...
7 comments posted 20yrs
posted by mqiqcqhqaqeqlqhqiqmqsq
7 comments posted 20yrs posted by mqiqcqhqaqeqlqhqiqmqsq

how to charge a 12V battery?

Hi All, You can see I am a noob. I would like to know how to charge batteries? For example, if I have a 1.5v AA battery...
9 comments posted 20yrs
posted by evilcookiemonster
9 comments posted 20yrs posted by evilcookiemonster

Positive Lightning?

Hi: Positive lightning consists of the movement of positive ions. Its voltage and amperage are considerably higher than...
22 comments posted 20yrs
posted by glucegen1
22 comments posted 20yrs posted by glucegen1

PIC16F876A in simulation

Hello, I have Pspice from Orcad. I want to build a circuit using a pic chip from microchip, the PIC16F876A. I cannot se...
12 comments posted 20yrs
posted by lerameur
12 comments posted 20yrs posted by lerameur

Need help checking my power calculations

Hi, I want to make a battery powered light, powered by a PIC. I have a rechargable 6.6 volt battery, and a 5 watt halog...
21 comments posted 20yrs
posted by someguy
21 comments posted 20yrs posted by someguy