# 10V DC Power Supply help

I've been researching power supply design techniques and information for the last few days and feel like I have a good understanding of how this is to work, but I can't seem to get my simulation to fruition.

The PS needs to have maximum of 5% error and .5% ripple. Current output isn't an issue, just something usable. SO basically the idea is I need something very smooth at 10V with basically no ripple. The other trick is that I can't use a solid state regulator, I have to design my own circuit.

So What I know is that I need a transformer to step down the ac voltage. Which then goes through a rectifier to convert to DC which steps down ~1.4 V if I use a full wave bridge rectifier (which I understand is the best for noise reduction)? Then I need a filter capacitor, which goes into a regulator circuit.

I have a design that simulates correctly on SPICE with a 12v rms transformer, but I don't actually have one. I think this would be cooler if I could use my 5V rms cell phone charger to get the 10V DC final result. Is this possible in a simple sense? This project is supposed to be fairly simple and I have most of the quirks figured out, I just can't produce the voltage I want with the 5v transformer.

BTW the regulator circuit I created is a shunt regulator just using a reference zener and some resistors to create feedback. I will post my circuit, any help is greatly appreciated!

Also the circuit is a complete rough draft which works for a 17v output from a transformer, but I would like to do it with a 7v if possible. Really Im just going for simplicity but need to meet specs.!

• You need to accept that any linear regulator will have LESS voltage at the output than at the input. If you want to build a switched mode power supply from 5V to 10V it is possible but requires an occilator with a tapped inductor at least, you can get an idea at the link electroschematics.com/7032/12v-to-120v-voltage-inverter on what is about the minimum to get a higher output voltage, you will still need your regulator circuit as well. Jul 14, 2015 at 16:44