Simple Amplifier

397

05:47:08

A simple amplifier.

Frequency range - 0Hz-15kHz
Amplification - 7.62/17.6db
Efficiency - 55% Although this is technically a class-A amplifier, it's more geared toward class-AB resulting in an efficiency above the theoretical maximum of 50%

published 8 years ago

hurz

8 years ago

Very instable design. A little difference in hFE at first stage does cause high DC offset at loudspeaker.

hurz

8 years ago

Check this to understand why http://everycircuit.com/circuit/6423615476072448

jason9

8 years ago

Please tell me how to follow links.

hurz

8 years ago

By click or touch or buy a better mobile? As workaround search for the long nr in url. Or search for "sunday bjt"

jason9

8 years ago

I have an iPad and tapping the link or copy and pasting it into the search bar don't work for me. But thank you for giving the circuit name so I can search for that.

jason9

8 years ago

I checked out the circuit and I don't understand what you're trying to show me.

jason9

8 years ago

But I do understand why the small difference in hfe makes such a big difference in output if that's what you're trying to say. I just didn't realize that that would be a problem when I made the circuit and I didn't really care because it's a perfect sim and it's not like I'm actually building it in real life. But I will welcome any suggestions for improvements if it keeps the simplicity and low distortion (or high gain which can be combined with negative feedback to make low distortion).

jason9

8 years ago

I think I understand what Sunday BJT is about: temperature can make a significant difference in gain, which this circuit is extremely vulnerable to, right?

hurz

8 years ago

Right

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