You cannot. the 7905 requires a negative input voltage.Easiest way to get -5V from +9V is to use Voltage regulator 7905.
Here's a clever method to obtain a negative supply from positive pulses.
www.edaboard.com/attachments/8893d1115569736-555_179.gif
Also:
newelectronicdesings2011.blogspot.com/2009/11/negative-supply-from-single-positive.html
Provides low power only. If you want more than a few mA...
Then you'll send the oscillator pulses to drive a mosfet. It will chop the pure + supply DC. Then you send that through the conversion stage. Use higher value capacitors depending.
I have seen that before. It works, but only for low current. I do not believe it can provide 300-500mA of current as it is.
I am interested to see the final though
These integrated solutions all work I am pretty sure and thank you.
Has anyone seen a way todo it using discrete components and avoiding the tapped coil?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?