[Amps] automatical blower speed regulation

[Angel Vilaseca]

Hi all,

To automatically regulate blower speed, how about the following:

Assume you have a 30 W, 110 V blower.

Wire a 110 V - 6 volt  30 VA transformer secondary in series with the HV 
primary transformer.

The HV transformer is many times larger than the 6 V one. Thus the 
current through the 6 volt winding will be highest when the amp is 
working at maximum power and lowest when the amp is idling. The loss of 
HV should be minimal. About 6 %.

Connect the blower to the 110v - 6 volt transformer primary. Voila.

The 6 Volt winding should have a few turns added/removed in order to 
have 110 V at the blower when the amp is working at maximal output.

Anyone already tried this?

Vy 73 de HB9SLV