Anybody know where I can get a collection of electrical symbols clip art

Hi Bob
Is this to draw circuit diagrams with? If so what are you having trouble with?
Adam

 

Tina Ti is what you need. It's free and very easy to use. Download it and give me a shout if you have any issues. http://www.ti.com/tool/tina-ti
Adam

 

Never used it. But I would stick to one package for the moment. If you want to do PCBs later on then DIP TRACE is another good package.
Adam

 

ExperssPCB is a free schematic/PCB program. The schematic program is pretty intuitive and easy the make new symbols or modify existing ones. You can export the schematics to Bitmap or Metafile formats. Note, it's not a simulator.

http://www.expresspcb.com/

Ken

 

I second ExpressPCB as the easiest package I have seen to learn and use, though the schematics are not particularly pretty.

Bob

 

Bob,

I disagree. I think the schematics are beautiful! Well, for the price.

Ken

 

It should flash on it's own.
Adam

 

Ahh I was mistaken. I have the student addition of Tina which does flash the LEDs. To see the output you can connect an Oscilloscope to the circuit using one of the meters to the circuit or use the transient analysis option. Tell me what you want to draw and I can help.
Adam

 

Robert you have opened a new post with the same circuit info. Just keep one otherwise it might confuse people. We will answer any questions related to this even questions about the drawing of the circuit. Choose one to carry on with. Any related info from the other can be merged by one of the moderators later.
Adam

 

Ok Robert, no probs.
Adam

 

You cant put a transistor directly across a battery.

 

All of the transistors in that circuit are connected directly between the positive and 0V rail of the battery.

As Colin mentioned, this is a no-go. As soon as one of those transistors conducts, it will short out the battery.
Step back, and think about the function you want the the transistors to do. Add a current limiting resistor and you will be much better off

Pull down resistor is connected between the transistor and the 0V line. You then take the measurement between the transistor and resistor.
When the transistor is 'off' it behaves like an open circuit and the measurement will be 0V. When the transistor turns 'on' it behaves like a short circuit which results in the full battery voltage being across the resistor. The measurement here will be 'high'.

Pull up resistor is connected between the transistor and the positive line. You then take the measurement between the transistor and resistor.
When the transistor is 'off' it behaves like an open circuit and the measurement will be 'high'. When the transistor turns 'on' it behaves like a short circuit which results in the full battery voltage being across the resistor. The measurement here will be 0V.

The difference is merely which side the resistor will be in relation to the transistor.
Other than that, if you are using a transistor to 'power' something that's a bit of a different story, but the resistor would essentially be replaced by what you want to power.

 

Guys stop posting on this thread. We have already covered this on another thread. Robert opened a very similar post with the same circuit. I noticed this and asked him just to post on the other thread to save confusion.
Cheers
Adam