Sorry I didn’t know how to word the question well. Ok, I’m very interested in being able to make my own circuits but I have a very limited knowledge of electronic components. I just want to make some basic circuits right now with some LED’s. All I need are the LED’s, some switches, and some copper wiring preferably all in one store. So where should I go to get those things? Also, how do you keep all the pieces in a circuit stuck together? I don’t just want to use tape to keep everything in place.

I am making a circuit that will have a 9v battery with the positive lead connected to a 7805 5v regulator. What transistor (npn) can I use that will act as an and gate ( what transistor will switch instead of amplify at 5v)? After that it is going to a four bit adder; if a charge were added to only the base, or only the collector, would a small charge be passed through that could trigger the adder.

I am confused how you can tell if transistor amplifies or switches at a certain voltage.

Does anyone know a transistor sold at electronic goldmine that would fit my needs.

If you find any transistor, could you tell me what resistor I would need for it (if at all) and link to it. If there are many that would work could you link to the cheapest one.
Any transistor can act as a switch or as an amplifier. "Yes but at different conditions, I want one that will act as a switch under my conditions."

What is driving the transistor? What does the regulator have to do with that? "The battery is driving both the collector and base (after switches) the regulator drops the battery down to five volts. I said 9v to 5v instead of 5v because 7805 might have an on board resistor, then you would know the voltage and amperage."

"fit my needs"? you need to tell us you need.
"A transistor that works as a switch at 5 volts, does not leak enough energy to trigger an adder, npn; hopefully is sold at electronics goldmine and cheap/small."

Please don't answer with questions justto get points.

im working on a project thats going to have to have a switch between a controller for a game console using 5 wires and i need another to switch between 2 ethernet ports.

some one told me just to use all switches but i dont want 13 switches

so how can i make the circuits to switch between the wires with 1 switch for the ethernet ports and 1 switch for the controller?

please give me the name of the parts. if possible a general price range and also if possible a layout

Hi i'm doing an electronic project that involves using logic gates and other IC components that accepts high and low voltage inputs (logic1, logic0).

But they don't work if I have a floating voltage input (undefinable voltage of whether high or low), my project converts analog signals to digital 5v signals for these components and is not planning to use any switches or such in the circuit. (No Physical contact);

So how can I remove these floating voltages.

Hi,
I have 2 D-cell batteries. How many V and A does it produce?
I have a circuit (from a robot toy) that looks something like this:
http://aug18.imghost.us/7xVa.jpg (the one in the box labeled A).
The circuit can switch between the three states (as can be seen in boxes labeled A,B and C). The circuit is powered by 2 D-cell batteries and powers a simple motor.
What I want to do now is: I have 2 wires, each are either off or on. When they are on, they produce 5V and 40mA each. I want to modify the switches (labeled in X,Y,Z) and the switches only that when one of the wire is on and the other is off, the circuit becomes in the B-state and if one of the wire is off and the other is on, the circuit becomes the C-state. And when both wires are off or both of them are on, the circuit becomes the A-state. How do I do this and what do I need to do this? What components do I need? Im really bad at calculating and designing electrical circuits.
Can anyone help?
Thanks!

It doesnt always happen, but occasionally, I cant get the wipers to work, it doesnt matter what wiper mode I select, ie: windshield wash, mist, or the normal delay, or low or high speed, it still gives a high pitched tone, that sounds nothing like an electric motor. But rather like a circuit board, such as a failing transistor? Then if I wait about a minute of not trying to get the wipers to move, and I try them again, all modes of wiper activity work. Any ideas? I dont think its the switches. Thanks

i have a 6V 4.5Ah Rechargeable Battery,And a small custom made 20W inverter hooked up with a CFL (compact Florescent lamp)

and i also have an external charger 7.5V 1A with alligator clips at the end..i have a small switch on the wire going to the inverter(from battery) and i use it to turn it on..and when i want to charge it…i have to reconnect the alligator clips of the ext. charget all the time..

my BASIC question is…i WANT to make this system fully automatic..like..when the pow from the mains is comming..then it will trun off the lamp and charge the batt…when the power fails ..it turns on the lamp using the battery,

NOTE:I DONT CARE for overcharging..i DONT need any over charging circuit..and i damn care if my battery explodes right in front of my eyes..I JUST NEED THE AUTOMATIC THING…please dont tell me circuit for charging and over charging cut-off..

now.. someone told me that i can use a thing called relay..exactly for this purpose…i got one rated at 12V..now..it has 5 Pins…2 are on one side..and 3 are on the other side…now that man told me that give it 12v frm mains via transformer…i thing my charger can be used for this purpose..it gives 7V and ..can it drive the 12V relay?..if so..
where to connect these things..

2 pins are on left side..on the corners..and 3 pins are on the right side..2 of them are in corners..and 3rd in center..is slightly closer to the left pins..i found no pic..on the google..

NOTE: it is NOT a car Relay..it is a PCB mountable small pins relay
what pins among them are the switches..?and where are the 12v voltage input pins to control the switch ?

The only electronic supplies I have are: Capacitors, resistors, diodes, switches, light bulbs, wire, and a bar of ferrite to make an inductor.