Sorry, I meant 7.5V, 2.5V is just the dropout voltage.
That's the dropout voltage of the LM78T05.
Therefore the minimum input voltage required for it to regulate properly will be 7.2V so you can increase the ripple to 3.33V
The circuit is fairly standard and can be found on Google.
Use this one if you like but with the following modifications:
- Increase 2,500µF capacitor to 10,000µF.
- Increase the 0.1µF capacitor to 0.33µF
- I've never seen an 8.5V transformer, use 9V instead.
- Use the LM78S05 instead of the LM7805.
- Use some diodes with a 3A rating instead of the 1N004 which is only rated to 1A.
**broken link removed**
**broken link removed**