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Old 28th September 2012, 11:53 AM   #1
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Default Transformer output on 5-15W Class AB Amp?

Hi all - my first post here.
After a few years tinkering with DIY oscillators, filters and FX - I'm starting to look at simple Class AB transistor amp designs around 5-15W.
My plan is to start with a simple 'cookbook' design and then work up to more complex builds.
I can power it using my bench supply so I'm a long way off worrying about power transformers - but I'm wondering about output transformers on SS designs.
Are there any reasons to consider using an output/audio transformer on these types of amp? If yes - any advice on things to consider?
Hope the question makes sense - I've never worked with transformers before.
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Old 28th September 2012, 11:58 AM   #2
Mooly is offline Mooly  United Kingdom
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Output transformers on transistor amps went out decades ago

If you are powering an amp from a normal bench PSU then you are really looking at an AC coupled design (and nothing wrong with that at all)

Do you have any specific circuits in mind ?
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Old 28th September 2012, 12:14 PM   #3
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Good - that's pretty much what I thought.

I was going to start with some schematics from "Diode, Transistor and FET Circuits Manual" by R. M. Marston - which has been a good reference for other transistor stuff I've done.

It starts with a simple 2x BJT complimentary pair and then has variations and add-ons up to a 10W Class AB amp.

I've also ordered a copy of Self's amplifier book but I'm up for hearing about other starting points

Thanks for the reply.
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