1. Home
  2. Electronics Design
  3. H-Bridge as Quasi Class AB Audio Amp ???

H-Bridge as Quasi Class AB Audio Amp ???

Has anyone come across a good discussion or schematic relative to using an h-bridge as a sort of class AB audio amplifier ?

Think of a motor as kind of a really bad sub-sub-woofer and ...

Splitting the input through an inverting and non-inverting op amp ... and biasing the transistor pairs to borderline conductance .... seems like it ought to go.

Not quite true AB quality, but good enough for a PA system or to drive sub-woofs perhaps. Low parts count and ability to use cheapo NPNs sans big transformers or caps would be plusses.

You see, I've got a ton of 3055s just sitting ... :-)

I've tried Googling ... but the necessary keywords bring up just too much junk, even after selecting-out "class d".

Reply to
Mr.B1ack
Loading thread data ...

I have made "bridged" linear amplifiers for various of my vehicles to get reasonable power... I can really light up a 280ZX ;-) ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
                    Help save the environment!
             Please dispose of socialism responsibly!
Reply to
Jim Thompson

TDA7294 is a pretty typical H-bridge amplifier for audio use. Unless you really want HIGH power, ICs are good enough (and accurate biasing of bipolar output stages is a dark art anyhow).

All-2n3055 amplifier final stages are more work than complementary pair amplifiers.

Reply to
whit3rd

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.