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Suggestion Hedgehog Mk.1 minor upgrade

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Lloyd
(@lloyd)
Noble Member
Topic starter
 

Just thought I’d see what the team think of this, I have been using one of my Hedghog standards converters with my TV22 whilst reviving it and couldn’t help notice the amount of heat given off by the regulator, a simple 7805 jobbie, and after reading Chris’ thread about his Owon bench multimeter I decided I might try one of those little 7805 switch mode replacements. I got 5 of them and they arrived yesterday, so today I set about testing one, firstly to make sure it was outputting 5V (it is) and also to see if it was noisy in any way.

On the scope there is a little noise, and loading up the regulator makes it drop significantly, so I was happy enough to try it in the Hedghog.

So far so good! there is an audible noise coming from the regulator, a faint sort of hiss noise, the Hedghog doesn’t seem to be protesting in any way yet, and the picture on the TV22 looks the same as it did before, no patterning and nothing obvious on the audio.

So can anyone see any reason not to fit one of these in place of the good old 7805?

 Regards 

Lloyd 

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Posted : 06/08/2022 2:29 pm
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Jac Janssen
(@jac-janssen)
Estimable Member
 

@lloyd 

Frank did the same in the Hedghog PSC - no reason not to do it.
Saves some heat inside the housing and you don't need a heat sink for the regulator.

Jac

 
Posted : 06/08/2022 4:31 pm
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Lloyd
(@lloyd)
Noble Member
Topic starter
 

@jac-janssen

Cheers for that, if it’s good enough to go in the PSC, then I’m happy to keep it in!

I have since mounted it horizontally, as I found I couldn’t get the lid back on with it vertical, not unless I mounted it at a funny angle.

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 Regards 

Lloyd 

 
Posted : 06/08/2022 5:33 pm
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Jac Janssen
(@jac-janssen)
Estimable Member
 

Excellent!

Jac

 
Posted : 06/08/2022 6:45 pm
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freya
(@freya)
Noble Member
 

Good job Lloyd, 

Its been fitted as standard to all my built Hedghogs when they are in stock, but after the first 60 went, getting them proved difficult for a time. 

 
Posted : 06/08/2022 7:45 pm
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