[ARC5] restoring hacked vhf receiver

[Scott Robinson]

Hi Robert,

Any switching power supply is chick full of harmonics, and needs a 
shielded enclosure and very careful filtering of both input and 
output--probably including feed-through capacitors--to quiet it.  The 
fundamental might be anywhere between 50 KHz and 1 MHz.

Good luck!

Scott Robinson

On 1/5/18 8:35 AM, Robert  Eleazer wrote:
> Gordon:

> By the way, I am wondering about those buck-boost converters you see for 
> sale for a few bucks the ones that can take in around 5 to 30VDC and put 
> out 1.5 V to 35 VDC.  I have been trying to build am LM350 circuit to 
> provide a little over an amp at 28 VDC to power a radio and while it 
> worked at first it's been driving me nuts.  Is the power out of those 
> buck/boost converters fairly clean or are there lots of harmonics?
> Thanks,
> 
> Wayne
> WB5WSV
> 
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