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Amplifying an ac sin wave 1khz...

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I've been playing around with the Heathkit IG-4505 oscilloscope calibrator circuit diagrams as I am trying to build my own for fun.

Turns out it amplifies a logic level square wave (up to 1MHz) to as much as 100V peak. It does this with a simple transistor amplifier. Which is actually pretty easy, really, since it is simply a case of turning the transistor on and off. Reproduced for educational purposes:

**broken link removed**

Caveat -- I haven't really gotten around to playing with this "in real life" :D And I seriously doubt it can support 250W output!! :D

As for AC amplification, starting with millivolts and ending up with 50V ... well, turntable cartridges output alternating signals around 2mV and amplify this to a signal that swings 50-100V or so. So, audio amplifier as stated above isn't a bad model I suppose? Although they use AC supply with + and - rails. And a sh~71oad of transistors. :D And it's not simple. :D

For sake of reference, my vintage HK680i receiver uses ±43.5V rails, outputs 70wpc into 8Ω ... uses two giant Toshiba power transistors as well as probably a dozen transistors just on a single channel driver board. To say nothing of the phono preamp which I haven't even glanced at yet. A 250W amp would be more involved, I imagine, but certainly those exist too.

Maybe add a DC component to the AC so at least you're dealing with a single +DC power supply?

Michael
 
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