I have started assembling a PSU out of some scrap.
My unloaded power transformer delivers approx. 390-0-390 volts AC at the secondary.
After diode rectification, I obtain around 358 Vdc (again, unloaded).
However, if I connect a power supply filtering/smoothing circuit (50uF/2.2K/50uF) to the output, the voltage at C1 and/or C2 jumps to over 500 Vdc - again, this is without any additional circuitry to load down the transformer.
Is this normal? Would B+ return to safer levels under load? Can I damage my input capacitor (rated for a mere 500V) by running the PSU unloaded?
I would like to build another RH84, wonder how I'd go about settling on or around 300 Vdc under load with this particular transformer?
Why does the voltage increase after C1, C2?
Thanks,
My unloaded power transformer delivers approx. 390-0-390 volts AC at the secondary.
After diode rectification, I obtain around 358 Vdc (again, unloaded).
However, if I connect a power supply filtering/smoothing circuit (50uF/2.2K/50uF) to the output, the voltage at C1 and/or C2 jumps to over 500 Vdc - again, this is without any additional circuitry to load down the transformer.
Is this normal? Would B+ return to safer levels under load? Can I damage my input capacitor (rated for a mere 500V) by running the PSU unloaded?
I would like to build another RH84, wonder how I'd go about settling on or around 300 Vdc under load with this particular transformer?
Why does the voltage increase after C1, C2?
Thanks,