tedmalone
Newbie level 4
![Newbie level 4](/styles/images/ranks/blevel1.gif)
I'm a noob to circuit design, but I am building a custom controller for my pool equipment and need to have 5v DC, 12v DC and 24v DC. The native transformer in the system is a 24v AC unit which I need to keep. To solve my problem, I've created a single circuit which supplies all of the DC voltages that I need. I believe that I've sized the capacitors properly and have chosen a combination of a bridge rectifier and 3 voltage regulators to provide the voltages I need.
I'm assuming that I may generate quite a bit of heat if I put too much load on the 5v circuit, so I'm planning to put a heat sink on that IC and measure temperature of the enclosure to make sure I stay within operating temperature. I also think I'm cutting it a bit close on the 24v DC line. My transformer puts out closer to 28v AC, but there is definitely some signal loss through the circuit. Fortunately, the only thing I need 24v DC for is a few relays and their minimum voltage to activate is 18v DC.
I've uploaded the circuit diagram to Skydrive and made it public. If anyone has time for a quick review, I would really appreciate your comments. I'm getting ready to break out the soldering iron. Also, if anyone would like the Visio of the circuit I'd be glad to share. I've included a parts list in case any other readers would like to try this at home.
Circuit design - https://skydrive.live.com/redir?resid=A7637C7D6CC3DC5!23878
I'm assuming that I may generate quite a bit of heat if I put too much load on the 5v circuit, so I'm planning to put a heat sink on that IC and measure temperature of the enclosure to make sure I stay within operating temperature. I also think I'm cutting it a bit close on the 24v DC line. My transformer puts out closer to 28v AC, but there is definitely some signal loss through the circuit. Fortunately, the only thing I need 24v DC for is a few relays and their minimum voltage to activate is 18v DC.
I've uploaded the circuit diagram to Skydrive and made it public. If anyone has time for a quick review, I would really appreciate your comments. I'm getting ready to break out the soldering iron. Also, if anyone would like the Visio of the circuit I'd be glad to share. I've included a parts list in case any other readers would like to try this at home.
Circuit design - https://skydrive.live.com/redir?resid=A7637C7D6CC3DC5!23878