[PT914]

Hi,

I am new to this site but have built the smaller kits from Hagerman Tech and am very impressed by the board quality.  I am using the PowerSupply kit to power an active crossover and need a little more mAs.  I dropped the transformer supply voltage and regulated the voltage to 12 which should give me about 150 mA, hopefully.  I noticed that my mains run at 124V to 125V and with the lower voltage transformer, I still get 21 volts just before the regulator.  My question is, can use the 15 volt regulator while still using the lower voltage transformer and still get the higher mA.  I read that the 15 volt regulator needs 17.5 volts.

Thanks,
Phil

[hagtech]

My question is, can use the 15 volt regulator while still using the lower voltage transformer and still get the higher mA. I read that the 15 volt regulator needs 17.5 volts?

Unfortunately not.  The transformer is limited by power, not current.  I forget, but I think it is a 5W core.  So that's all you get from the output; current equals power divided by voltage.  You can substitute a larger transformer.  It just won't fit into the board nicely.

jh

[PT914]

Jim,

I just noticed that a 7 watt transformer has the same pin deminstions as the 5 watt.  It is just a little taller.  I'll try that.

Phil