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hi , i have plan using a pair of LL7903 as parafeed output in 4:1 mode for a line stage
to calculate the right Parafeed Cap i need the primary inductance off the transfo , any idea?
is it necessary to have a load on the secondary for the ringing?
cheers.
Follow Ups:
I use the 7903 1:4 at the input of my amplifier. I measured to conclude that ~640H is a useful value for calculations in this configuration.
Here is how I do it.
what is the max AC input level a LL7903 can handle without too much distortion? in 4:1 mode?
thanks
With all of the primary windings in series, the data sheet specification implies that the 0.1% THD point at 50Hz is reached at about 4.6Vrms and the 1% THD level at roughyl 5 times that voltage.
Kevin Carter
K&K Audio
www.kandkaudio.com
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