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Many thanks for your help Majenko. Do you think there is any way to get around the issues with the board as it is? I've (foolishly) already sent 10 of those to print. I'm guessing with 1, I could add the capacitors off board. Also doesn't the 1N4007 help at all?

oduffy
– oduffy

2017-01-05 19:45:07 +00:00
Commented Jan 5, 2017 at 19:45
Most things you can work out a way to solder them in afterwards. The biggest issue will be heat from the regulator. By adding a switching regulator on a separate board to feed the 7805 you would solve that problem. Regulate down to about 7v.

Majenko
– Majenko

2017-01-05 19:48:07 +00:00
Commented Jan 5, 2017 at 19:48
The 1N4007 will just drop 0.7V so does very little in the scheme of things. It is really only for reverse power protection.

Majenko
– Majenko

2017-01-05 19:49:04 +00:00
Commented Jan 5, 2017 at 19:49
Ah I see, so putting something like this to feed the 7805 should solve the problem? ebay.eu/2hVTZRX

oduffy
– oduffy

2017-01-05 20:19:48 +00:00
Commented Jan 5, 2017 at 20:19
No, exactly oposite of that - step-up converts low voltage to higher (say input 3.2V and output of 7V (to feed your own 7805). You want step-down (like this one ebay.co.uk/itm/… or any other with Input rang covering yours 12-24V (rather little more) and OUTPUT of 7V for your 7805. Maybe you can even go with some outputting 5V and big capacitor to filter the switching noise, if you want risk and save more money.

gilhad
– gilhad

2017-01-05 20:42:41 +00:00
Commented Jan 5, 2017 at 20:42

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