I have designed an opamp based on thfollowing square wave setup http://www.national.com/ds/LM/LM124.pdf on page 11. I want to know what i would have to adjust to lower the frequency to the range of 10 hertz, it has a 5 volt input and the frequency range is at 10 Ghz I believe. any help would...
I need to power an op amp and my only power supply availible is a 9-v battery, the goal is for the device to be portable. I need to feed into the + and - sides of the op-amp. Would I connect the positive terminal to one end and the negative terminal to the other or is there some other set up I...
I am trying to design a circuit that has 20 mA acoss an LED, I had been advised I could use a voltage regulator to keep the current at 20 mA. However, I am not exactly sure as to how to set up the circuit. Would I set it up so that it would maintain a voltage and then run that voltage across a...
I have a DC power source and 2 LED's. I know they are polarized and only work with the current running one way. I need to swtich between the two electrodes but I am not sure how to design a circuit using a DC source that will switch back and forth at a defined rate. Can anyone suggest either...