Yeah, ALPHA did it on the Alpha 77 in 1977...
They used a 50V bucking winding in the main power transformer running the
blower at 75V and as the thing loaded down the voltage would drop speeding
up the blower. It worked just fine, if you threw a carrier you could hear
the blower spinning up.
I wouldn't put anything in the main primary winding to effect the line
voltage. Every watt to me is like gold and loading down the HV is against
my religion. Total sacrilege.
BOB DD
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Angel Vilaseca
Sent: Tuesday, May 22, 2007 12:27 AM
To: amps@contesting.com
Subject: [Amps] automatical blower speed regulation
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
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