The 7812 has been around for nearly 50 years now.? If you happen to have some collecting dust in a drawer, go ahead and use them.? But the dropout voltage at 1 Amp is 2 Volts, meaning you need at least a 14 Volt battery to get 12 Volts into the rig.? Newer parts such as the LM2940CT-12 and MIC29150-12WT have a dropout voltage of only 0.3 or 0.5 Volts, and offer reverse polarity protection.??
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Jerry, KE7ER
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On Fri, Nov 1, 2024 at 12:53 PM, <dhorner@...> wrote:
Yes until you tweaked it in and wanted the little scary extra output at 16v , i would go with more diodes, a 9v power supply or maybe a 12v regulator or supply. I find some of the switching voltage droppers to be really noisy as they run at about 49khz and make lots of noise. The old 7809 and 7812's are still a nice way to go with appropriate heat sink.
