On Fri, 20 Jan 2006 04:31:26 GMT, "U-Know-Who"
wrote:

+
+"james" wrote in message
...
+ On 19 Jan 2006 13:39:54 -0800, "Professor"
+ wrote:
+
++James is certainly right... if you plan to draw much current from your
++supply... you may have make other arrangements then just dropping all
++that voltage. That thing will be a real furnace.
++
++Professor
++www.telstar-electronics.com
+ *****
+
+ I was once thinking of using a transformer that had a secondary
+ voltage of 36VAC and use pass transistors I had in my spare box. I
+ wanted to use a T0-220 case NPN and the design required the use of 8
+ of them in order to lower the heat dissapation per transistor. That
+ changed my mind and ended up usign a different transformer.
+
+ james
+
+Usually, transformers can be found more reasonably priced than
+semiconductors of high current ratings, especially surplus!
+
******

I am well aware of that. I picked up a nice transformer for $10 once.
4200 VAC CT at 2 amps intermmittant secondary. The transformer was one
cubic foot and weighed 85 lbs.

If you know where the surplus shops are, transformers and power supply
parts can be had for realtively cheap prices.

james