Electronics Forum / Basics / March 2007

Hello All;
   I have a Sansui 9090 since I bought it new. Other then a few small
problems with it over the 30+ years I have own and operated it has been a
great receiver. Reciently I was playing tunes, when suddenly the receiver

I'm very new to this elecrronic stuff, but I was able to do what I
needed with the 555 timer, but I am lost with trying to get the 556 to
do what I need.
I'm using a 556 timer and below is what I would like to happen. If

I have a very old valve radio from a company called Lafayette.
It has 6 valves which are
6v6 gt
6x5 gt

i'm building a small electronics project which was bought in kit form...
bear with me i'm a beginner ;)
everything is soldered onto the board except for a few components i'm not
sure about...

Would like to build a digital clock with a long-duration mechanical
escapement ("artistic" part).
I found Bill Bowen's site
http://ourworld.compuserve.com/homepages/Bill_Bowden/

I don't have any clue about electricity, I would like to ask a
question regarding DC adapters. How can I create 15 volt DC out of 2
adapters? Can i just join the wire together, one adapter is set so 12
Volt and the other is set to 3 Volt? Will those create 15 Volt

Please assist me with the following.
I would like to make some replicable magnetic electronic nanobots that
will search for sample playback MIDI synths in any part of the world
and attach to the digital chips of sample playback MIDI synths. These

I have a battery charger IC that tells you the IC's function via a "staus" pin
output that's one of three states: Hi-Z when a battery isn't present or is too
hot or cold to charge, high when it's actively charging, and low when it's
finished charging.  I'd like to convert this ...

I'm designing a circuit, wherein I'm trying to use a 555 operating in
monostable mode to turn on an array of sensors for about one second.
I've chosen by exernal R (10k) and C(100u) accordingly. My trouble is
with the triggering. My triggering will be coming from a close contact

Hi All - I found this newsgroup and was wondering if anyone could help
me.
I'd like to connect a magnetic sensor (bicycle computer) directly to
my computer through one of the ports without a power supply.

How can I calculate the output level of a microphone,
I assume it is found from the Sensitivity , but how?
For example, I want to know what voltage I will
get if the SPL is 60dBA (on the sound level meter)

i forgot to switch to 230v when plugging in my american desktop in
france, there was a pop, and now it wont start. did i completely break
it or is there a circuit breaker or something i can fix

During the winter season, outside temperatures can go down to 10
degrees Farenheit or lower.
Since many people carry their laptop computers to and from work
each day, I was wondering whether exposure to cold temperatures

Creative Music Synth -- my favorite *soundcard*-based MIDI synth-- is
the chip-based, hardware, digital FM synth present on the SoundBlaster
16 ISA card. Creative Music Synth usually has and I/O address of 220
-- hence, Creative Music Synth [220]. However, I have seen Creative

Problem with Relatives watching Excessive TV their Addicts?
Despite the obvious solutions,
Is there an electronic mini tv remote control that will jam the tv