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I need a datasheet

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riyantoro

New Member
Hi all
I wanna make an amplifier type AB
Anyone of you can help me please..
What kind of transistor should I use?
I have used BC 637 n BC 638 but i failed
Help me please..

Thanks
:lol:
 

Sebi

Active Member
Be more specific: need the output power (W), output (speaker) impedance (ohms) and the supply voltage....
 

riyantoro

New Member
Sebi said:
Be more specific: need the output power (W), output (speaker) impedance (ohms) and the supply voltage....

output speaker: 5W
impedance 8 Ohm
Vcc 12 Volt
Imean the power supply voltage is 12 Volt..

thanks for helping me..
:p
 

Nigel Goodwin

Super Moderator
Most Helpful Member
riyantoro said:
Sebi said:
Be more specific: need the output power (W), output (speaker) impedance (ohms) and the supply voltage....

output speaker: 5W
impedance 8 ohm
Vcc 12 Volt
Imean the power supply voltage is 12 Volt..

thanks for helping me..
:p

You can't get 5W into 8 ohms from 12V, unless you use a speaker coupling transformer, or a bridged amplifier (two amplifiers). Maximum power into 8 ohms off 12V is only about 2W for a normal single ended amplifier.
 

hotwaterwizard

Active Member
How about this one?
2410-Push-Pull_Transistor_Amplifier.gif


or this one?

https://www.redcircuits.com/Page80.htm
2411-Amp3.GIF


or this one?

https://sound.westhost.com/jll_hood.htm
2412-jlh_fig3.gif
 

riyantoro

New Member
Oh, that's too complex man..
I'm still a beginner.. :p
Well, i'm so sorry coz i wanna make an Amplifier type AB not type A like you mean..

Then, i used a speaker with this specification:
8 Ohm 1/4 Watt, not 5 Watt
I still use 12 volt of Vcc
 

TheOne

New Member
Here is a simple design based around a common LF351 opamp that will drive a small loudspeaker. The transistors act as current boosters for the opamp. The transistors you mention would also work as any other small NPN, PNP pair

The DC gain is 100 with the 3.9nF cap rolling off the gain at higher frequencies. Depending on what your input level will be you may need to have a potentiometer on the input to attenuate high input levels.
 

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