Re: Beginner wants to build some circuit-controlled LEDs. He
Hi Dubious
I'll give u a quick idea. Voltage follower is something that gives the same voltage in its output as it is in its input.What is its use? Well, lets say u have a point in a circuit, where u measure 5 volts, but when u connect a load (eg, a resistor or anything else to which u want to supply the voltage at that point) across it and ground, u see that the voltage at that point drops to, lets say, 2V. This is called Loading Effect and is because of the points inability to supply enough current. In such cases u apply a voltage follower which can supply larger currents.
Another quick and simple idea, connect a 1K resistor to a led and supply 5V, repeat the experiment with 10V supply. You should see that the LED grows brighter, as increase in circuit voltage gives rise to increase in current flow. thus u can try building a summing amplifier, whose one input is constant 5V, and the other input is the output of a 5V peak monostable. To the output of the summing amplifier u can connect the resitor+LED circuit.
I understand there are much simpler methods to achieve your requirement. But I am quite busy right now so I will try to send you a better design in a few days. I hope my information has helped and please feel free to ask me later if you need any help.