Basic microphone element to a speaker

[jbelectric777]

Hi All, I was wondering if I could use an NE555 timer along with a transistor to drive a 4 ohm speaker. I dont know much at all in that area, maybe I dont even need a 555 and it can be done with a few transistors and caps. If possible provide a link or draw and post something for me. All I wanna do is drive the speaker via the mic element. Thanks in advance for any help

 

[audioguru]

The max allowed output current from a 555 is only 200mA. If the 555 has a 10V supply then its max current into a 4 ohm speaker will try to be 525mA or 1.9A depending on how the speaker is connected. The 555 will blow up.

A 555 is a timer and an oscillator, not an amplifier.

Your mic needs a preamp that is designed for its type and the speaker needs a power amplifier.

 

[Hero999]

Use a 64hm: speaker if you can get hold of one - it'll be much louder than an 8hm: with a restor in series with it.

 

[jbelectric777]

ok, i understand the 555 is only good for 200ma and it did get real hot so what should i use a transistor ? what kind?

 

[audioguru]

A 555 is not a power amplfier. A mic feeds a preamp which amplifies its low level about 30 times, then it feeds a volume control that feeds a power amplifier. The power amplifier drives the speaker.

A 555 makes clicks, buzzes or high frequency whines and its output can be switched ibto the input of the power amplifier.