Hi All,
Never paid much attention to this detail.... :
A year ago i bought a 24VA planar encapsulated transformer unit with 18-0-18 secondaries, it works good but it is a bit too big for my 1u rack box. So i'm going to get a lower wattage model : 6VA. 2x18v 2x167ma 2x24,3v unloaded
(My supplier only has 24VA or 6VA). Its unload voltage regulation(after datasheet specs) shows 6v difference from loaded condition. ¿is that unload regulation CRITICAL or dangerous?
When i used 30w toroidal transformers there was a 2-3 volts difference between load unload voltage, but under load the voltages where ok 18v, 17,6v or so.
The power supply i built (with the 24VA transformer) is made with lm317/337 regulators, 2200uf filter caps.
Now i realize that bigger transformers have better load/unload voltage regulation.
The circuit to feed is small signal, two dip10 DPDT relays and opamps LM833P only and draws 40ma. So by power cappability 6va is clearly enough, but voltage regulation worries me..
¡Thank you for your help!
JAY X
Never paid much attention to this detail.... :
A year ago i bought a 24VA planar encapsulated transformer unit with 18-0-18 secondaries, it works good but it is a bit too big for my 1u rack box. So i'm going to get a lower wattage model : 6VA. 2x18v 2x167ma 2x24,3v unloaded
(My supplier only has 24VA or 6VA). Its unload voltage regulation(after datasheet specs) shows 6v difference from loaded condition. ¿is that unload regulation CRITICAL or dangerous?
When i used 30w toroidal transformers there was a 2-3 volts difference between load unload voltage, but under load the voltages where ok 18v, 17,6v or so.
The power supply i built (with the 24VA transformer) is made with lm317/337 regulators, 2200uf filter caps.
Now i realize that bigger transformers have better load/unload voltage regulation.
The circuit to feed is small signal, two dip10 DPDT relays and opamps LM833P only and draws 40ma. So by power cappability 6va is clearly enough, but voltage regulation worries me..
¡Thank you for your help!
JAY X