what parameters do I need consider in replacing transistors?
my idea... please tell me if i'm wrong
Vceo must be greater than or equal than the original.
Ic must be greater than or equal than the original
Power dissipation must be greater than or equal than the original.
Frequency range -- no...
I found a site for calculating filter capacitor values...
http://my.integritynet.com.au/purdic/power1.html
If we accept the 2.5% ripple as adequate for our purposes then at 13V this becomes 13 * 0.025 = 0.325 Vrms. The peak to peak value is 2.828 times this value. Vrip = 0.325V X 2.828 = 0.92...
I just bought a transformer; multi-tapped 0-6-12-24, 12 Amp.
Does it mean it can go up to the max 24 volts rms - 12 Amp ???
What's the min filter capactior value if used as a dc power supply?
( big capactors are expensive >.< )
Some transformers are rated in VA, what does it mean?
Will it work for 3A?
and... ( from the site )
"NOTE: &nbspR2 is determined by the voltage across the 220 uF Cap.
(Volts - 1.2)
R2 = -------------
.015
Any Resistor close to the calculated value should be fine. Its only purpose is for an approximate 15 mA current...