🚀 go-pugleaf

In article <36ue41$880@bcarh8ab.bnr.ca>, stud7b11@bcars564.bnrottawa (Tom Nagy) writes:
|> 
|> Hi everyone.  Sorry about the crossposting, but I think
|> this applies to all newgroups in question.
|> 
|> In an amplifier circuit that I am currently fiddling
|> with, the spec. says to use a toroidal transformer in the
|> power supply.  Why is this important?  How would I be
|> degrading the performance of the amp with a plain-vanilla
|> transformer?
|> 
|> Thanks in advance,
|> 
|> Tom Nagy
|> 
|> Please post responses, as I don't have email access.
Yes, as another poster mentioned, there is a difference.
Pound for pond, and cubic inch for cubic inch, the toroid
is alot more transformer. Yes, there is a problem with 
inrush current, but just build a delay circuit that first
connects the primary with a 50 ohm to 100ohm series resistor. 
Then shunt this resistor with a power relay when the cap 
voltage  reaches 80 to 90 % of final value. This is easily done
with a zener and series resitor giving base drive to a common
emitter NPN, using the collector to pull the negative
coil pin to a VCEsat above ground. While you are doing a 
circuit such as this, also add a delayed switching of the
output relays. This avoids pops caused by transients in
the amplifier supply line.