# Simple Amplifier

Discussion in 'Electronics Homework Help' started by Electro132, Apr 21, 2013.

1. ### Electro132

261
3
Feb 12, 2013
Hi,

I want to build an amplifier but i'm not sure how to so i need some guidance in this. I've attached what i started with. It's going to connect onto 2 different circuits: one that runs on 3 v and the other on 9 volts. They both should have the trimpot turned fully on for maximum output. Thanks

File size:
7.6 KB
Views:
164
2. ### davennModerator

13,833
1,950
Sep 5, 2009
1) what are you wanting to amplify ? an audio signal? something else ?

2) what is the source of the signal ?

3) if an audio signal, are you expecting the amplifier to drive a speaker ?

4) if an audio signal, do you want mono or stereo ?

Dave

3. ### Electro132

261
3
Feb 12, 2013

The source of the signal is a wave (sine,saw,) and i want the amplifier to boost this signal to the max while also passing on the new current created after the amplification to the output device. The wave will be based on 3 v.

4. ### duke37

5,364
771
Jan 9, 2011
The Droitwich transmitter takes a sine wave signal and gives 200kW out. Is this sufficient or is your max more than this?

5. ### Electro132

261
3
Feb 12, 2013

Wow.... well i'm planning on sending it through an LED. So the max i know is 150 mA output or something on an IR LED. Can this accommodate such a voltage or will it blow up?
I have the schematic.

File size:
38.8 KB
Views:
98
6. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,496
2,837
Jan 21, 2010
OK, that "protection diode" is in the wrong place.

Point it the other way around and place it in parallel with the LED.

That circuit will allow a maximum input voltage of around 20 volts before anything nasty happens.

Try connecting it to the output of an ipod or a radio or something like that first.