On Sun, 17 Jul 2005 18:00:29 +0000 (UTC), "Paul D. Spiegel"
wrote:

Let's take an example of a constant-current Class A output stage:

Load = 4 ohms
Peak-to-Peak (P-P) output voltage before clipping is 8 volts.
Using the voltage power formula:
(8*8)/4=16 watts

Error number one.

However, it's customary to represent voltage with the root mean square
(RMS) value. So 8 P-P becomes 5.66v rms

Error number two.

The constant current of the primary is 100ma. The output transformer
has a winding ratio of 35:1 so this calculates to 3.5a at the secondary.

Using the current power calculation:
(3.5*3.5)*4= 49 watts

Error number three.

Comments?

Really, I think that a primary text would be the most useful place
to start. In the USA, the ARRL handbook, refined over the decades
and available at in public library, is tough to beat.

Good fortune,

Chris Hornbeck