Re: Klaas's magnetic deflection amplifier circuit
Posted: Tue Nov 28, 2017 11:20 pm
Klaas Robers wrote:Why are there 4 wires in parallel?
i don't know if they are just yet klaas as only took left or a right reading apart from trying the 1 pin and 8 when shorting 4 and 5 to get 8 ohms .
I will test right side to left side and see what i get ..i under stand what your thinking as why all one side is shorted it does make sense that they have to be connected left and right side coils i will see tomorrow if i can give some numbers
In a normal TV the horizontal deflection is running a saw tooth of 16 kHz. Then, especially during the fast fly back, there are such high frequencies running, that the current has no time to run deeper in copper wires. So they run only in the surface of the wire. This is called the "Skin Effect".
The horizontal deflection coil needs to have a low resistance. Normally this is obtained by a thick wire. But then, due to the skin effect, the current runs only in the outer part of the wire, so the copper is only partly used.
OH that's the reason for the wire size difference ! had not come across that or explained before .
[/quote]This can be overcome by using several mutually insulated wires in parallel. At both ends they are soldered together. That is why the H-coil is made up of 4 wires in parallel. They all have the same length, so they should have the same resistance after you disconnected them all, at both ends. Then you should find 4 wires that are fully insulated from each other.
When i test left to right side only tomorrow might work out the wiring better as left to right visa versa must be going to either side to the lugs