Hi,
I need an isolated 5 volt supply for a digital meter in a bench power supply project. I was wondering if it was possible to tap into the power supply transformer's secondary and connect a completely separate 5 volt supply for the meter, or an I going to have to fit in another transformer just for the meter?
The reason I ask is because space is getting very tight in the case and I'm not sure I can find a small enough transformer to fit.
I tried using a 7805 off the existing rectified and filtered supply, but that doesn't work right for some reason, the 5 volts out of the 7805 drops in half when the meter is connected.
The meter will work off the regulated voltage, but if the voltage is set below 5 the display gets dim and at very low voltage it shuts off completely.
Thanks for any help
- Rick
I need an isolated 5 volt supply for a digital meter in a bench power supply project. I was wondering if it was possible to tap into the power supply transformer's secondary and connect a completely separate 5 volt supply for the meter, or an I going to have to fit in another transformer just for the meter?
The reason I ask is because space is getting very tight in the case and I'm not sure I can find a small enough transformer to fit.
I tried using a 7805 off the existing rectified and filtered supply, but that doesn't work right for some reason, the 5 volts out of the 7805 drops in half when the meter is connected.
The meter will work off the regulated voltage, but if the voltage is set below 5 the display gets dim and at very low voltage it shuts off completely.
Thanks for any help
- Rick