DocWonder
join:2003-01-11
Miami, FL | reply to public
Re: Cayman 3220-H running hot with stock Power Adapter
So a 6.5 V 2.0A switching power adapter is the final answer? |
|
WB6PWJ
join:2004-05-12
Anaheim, CA
 ·VOIPo
| The voltage must be above the regulater min. As I recall a 7805 for example has a 2.5 to 3v difference. at 5V I would not feed less than eight. Later designs require less but they all must have more input than output. The problem is that that difference is thrown away as heat. With a large heat sink you could run twenty volts into the regulater. All that would do is heat up the cabinet. The reason that switching regulaters are prefeered is that they can run at 90% efficentcy. The 7805 in the above example would be 25% at 20v. 50% at 10V, etc. |
|
