3801Re: [Sangean803] Re: Tuning encoder and power supply
- Apr 18 9:47 PMOne wonders if the 803A has a regulator. What do you think causes the border of the LCD display to darken?
On Fri, Apr 18, 2014 11:42 AM BRT joerotello@... wrote:
>Under no-load, and coming from an unregulated AC adapter, 13.4v coming from a 9v DC output transformer-based AC adapter is just about normal.
> Under load, aka when the supplied receiver or equipment is powered on, the under-load DC as measured should be about 9v DC, plus or minus maybe 5% at best to as much as 10% "voltage variance", depending on the qualities of the AC adapter.
> The receivers generally -- but NOT always! -- have internal voltage regulators, say 5v, 7.5v, 9v, 15v, etc., that can safely handle that variance...
> Still, that variance and load/no-load differences is/are reasons why regulated AC adapters are sometimes preferred, (OR) we can prefer to make our own, (OR) in some cases, we can modify un-regulated AC adaptors to regulate them.
> All are options and choices.
> Joe Rotello / Knoxville, TN / USA
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