Hi navy Sure, a PWM circuit could be made for this purpose but I would try to find a ready built unit, try Zapi or Sevcon they have compact and protected systems. Ante ::)
Quite often the things you connect to a PSU are equipped with big capacitors on their input. If you have a big capacitor on the PSU output it reduces the rushin current from the powerstage. The zener can easily be checked by connecting it in series with a resistor and measure the voltage across. Ante ::)
Mastrilla, Sometimes a variac is not isolated from mains and in that case it is dangerous to use for a PSU. If you take a look here http://www.action-electronics.com/variac.htm#Vary you can see that only one out of five is insulated. When it is not insulated means that the secondary winding is part of the primary and if you connect live to the wrong side you can kill yourself! :o And we don
Hi John Some research in old books: 2SD2065 :NPN power/audio/switch ,140Volts 7A 80W Can be replaced with BD245D 2SC2706 2SC2837 2SC3907 Question : Does the 2SD2065 have an insulated case? One of my books states that the comparison type does not have insulated case, so makes me wonder :-\ Ante ::)
Hi Kevin, Do you have a multimeter? If so why not measure the voltage over the Zener? Why do you think a large capacitor on the output is negligent design? Ante ::)
Siddhu, While we are waiting........................ To charge any form of battery there are a threshold for the current/voltage. If there is not enough energy you cannot overcome this threshold and there will be no charging done. Ante ::)
Hi, John I found the info in a book, and now I found it on the net also: http://perso.wanadoo.fr/pouzou/site/composants/sd/2s2000.htm Good Luck! Ante ::)