Did you look up "Darlington transistor"? Two transistors with a gain of 60 will give you 60 x 60, so 3600. MORE than enough. And the current is very small. That 2N3904 will do very well, and it is easy to get.
i have another question lol sorry but this is the last:
when i want to put a resistor with "commad " (i don't know how to say it in english ) to control the quantity of the light i will put it insted the 300Ω resistor right?
and from ....Ω to ....Ω can i putt for it?
and the battery should be from 3v to 9v with the modifications right?
A guy who knows nothing about electronics and hardly speaks English is trying to make an LED flash with sound?
Using a mic, a preamp but no rectifier and no LED driver?
A guy who knows nothing about electronics and hardly speaks English is trying to make an LED flash with sound?
Using a mic, a preamp but no rectifier and no LED driver?
Yes, and I suspect he will learn a little something about biasing transistors in the process... afraid that circuit won't work very well. The light is on, mostly - but it DOES flicker if you blow on the mic hard, so I'll give myself half a point, after all - IT WAS AN EMERGENCY!!!!
**broken link removed**
If he's curious enough to increase that troublesome 100k resistor to a whopping ten megaohms, he will discover the LED gets quite dark when he yells loudly into the mic.
If he's further curious about biasing NPN transistors, he may discover the right way to do it (a 1 meg from the base to Vcc, 500k pot from the base to ground, no collector-base resistor) will, in fact, make the light light when you yell at it.
Does not need a recitifier, it's kept just below the 1.4V needed to drive the darlington.
i'm beck again guys thx for ur help :
can u show me the right way to do it duffy but i want it to be with a transistor (what is a meg?)
and for audioguru i'm still learning i'm trying but this is my first circuit i will ever make so it's my starting with the word of electronics so plz be patient with me and i maybe in the future u will ask and i will answer u
$crooge's. One fewer transistor, charge pump on the base of the second transistor.
That first circuit will work, if you make it a Darlington transistor, and use a "voltage divider bias" with 1M (megaohm) as the top resistor and a 500k (kilo-ohm) potentiometer (connected as a rheostat) as the bottom resistor.
And if you don't mind yelling. The gain isn't impressive. Really needs three transistors.