Need help confirming some hunches. I'm trying to figure out what type of circuit this is: http://img442.imageshack.us/i/78389584.jpg/ Any ideas? Also, I think the logic expressio …

Some sound card audio jacks can now inform recent Windows OS's that an audio device is plugged in. Anyone know how it does this? I'm thinking it uses some kind of voltage compara …

For the last few days I have been trying without any luck to find a good tutorial on simple circuit simulations. I am a relatively new hobbyist and I figure if I use simulations an …

Do you know of any freeware or low cost circuit / PCB design software? I know a few which I have listed below but I was wondering if there were more of its kind. Please mention th …

It do provide the full set of logic functionality,but its arithmetic functionalities are not so clear,which do not contain a minus b and a plus b at the same time. Could you provi …

Anyone got any super simple circuit designs for converting 1.5v dc to 9v dc? Maybe something that uses a couple of transistors would be good?

What are the advantages of stranded vs solid wire? what should i be using for prototyping circuits?

I am looking for tool to draw circuits on Mac OS X. I mostly need it so I can add it into presentations. So the requirements are that it looks preety.

The title pretty much says it all. I have an idea to try out involving a op-amp differentiator circuit and a diode bridge, but I am flying blind. Also I am trying to accomplish t …

I'm looking for an alternative to the conductive thread (since i lack some sowing skills). I have seen this: http://www.littlebirdelectronics.com/products/silver-conductive-pen …

Here's a circuit diagram. Circuit diagram is below. It's a signal response test circuit from the spec sheet for a HA-5195 op amp and looks like a non-inverting amplifier circuit w …

I need to build a programmable current source from a 8051 microcontroller. It needs an output current from 0 to 10mA maximun. How do i go about doing this? what circuits do i n …

Hi everyone, I bought three spring-return, push-type solenoid. I can't remember them being sticky from the start because I only was using one at a time, but they may have been. N …

Hi i am trying to make a UPS for a project that requires 12Volts. I'm currently using a replay diode and capacitor. My problem is that when the switchover occurs, the voltage dro …