simple amplifier

[gudjoe]

hi friends I need a simple amplifier circuit that would amplify as low as 4ma to about 600ma-800ma to drive about 30 to 40 leds please I love very simple circuit if a single transistor is possible it will be better thanks

 

[MikeMl]

What supply voltage? What is the source of the 4mA control signal?

 

[Sceadwian]

I'm not so sure it's a control signal, I think he wants a circuit that will amplify the power =\

 

[gudjoe]

the supply voltage is 5v and the source of the 4ma is an inverter

 

[Sceadwian]

You can't just create power out of thin air. If your inverter supplies 5ma at 5 volts that's all you can get out of it. If you need more power than that you have to have a more capable power supply.
You need to specifically state what you're trying to accomplish here and exactly what hardware you currently have because what you're saying doesn't make sense.

 

[MikeMl]

An "logic-level" NFET will work. So will the circuit posted below:

Note that the inverter only has to supply 140uA. The 3055 sinks 0.6A no-sweat.