Re: Flyback HV terminals (fwd)

["High Voltage list" <hvlist@xxxxxxxxxx>]

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sun, 4 Mar 2007 13:15:13 -0500
From: Richard Hull <rhull@xxxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Flyback HV terminals (fwd)

Modern flybacks have diodes in them and postive DC is the output on the long
top wire, so no rectifier is needed.

The primary connections and the return for the High voltage, (ground), are
on those circular row of bottom pins and it is a crapshoot as to what is
what.  The base of the secondary (HV return) is best found by getting a sine
wave oscillator connecting it to the hv lead through an LED.  Tune the
oscillator to about 10khz, then with the other lead of the oscillator probe
the bottom pins with it until the LED lights.  This is the HV return or
bottom of the secondary and it is usually ground.

The primary is a bit more difficult to find, but can be isolated through
trial and error as the remaining 4-6 pins on the base are usually connected
as pairs of coils.  The highest ohmic resistance of the three or four base
coils is most likely the primary.  All the other coils are low voltage coils
for the picture tube filament and other low voltage supplies in the TV and
can be ignored.

Richard Hull


----- Original Message ----- 
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: "hvlist" <hvlist@xxxxxxxxxx>
Sent: Saturday, March 03, 2007 4:12 PM
Subject: Flyback HV terminals (fwd)


> Original poster: Steven Roys <sroys@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sat, 3 Mar 2007 12:22:49 -0800 (PST)
> From: Chris Roberts <quezacotl_14000000000000@xxxxxxxxx>
> To: hvlist@xxxxxxxxxx
> Subject: Flyback HV terminals
>
> Hello list,
>   I have had a large flyback transformer that has been sittting around in
my parts box for a while. I am thinking of putting it to use now as a HV
power supply, the only thing left for me to do is to figure out where said
HV comes out. =D I see one large insulated wire coming out of the large
secondary, however, that seems like the only connection. There are lots of
other taps around the secondary, but they all measured the same resistance
relative to the large insulated wire. So does anybody know where the other
end of the secondary goes? Thanks in advance for the help.
>
>
>
> -Chris
>
> "The trouble is not that the world is full of fools, it's just that
lightning isn't distributed right." -Mark Twain
>
>
>
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