Hi new to forum and everything..
I have been tinkering with picaxe and this runs on 4.5 volt
In the same box I have 24v (22.2v) battery supply from 6x 18650 batteries to run relays and 24v prox sensors.
I don’t really want separate batteries for pic axe.
I need a circuit to reduce the 20 to 24v to run the pic axe and not fluctuate on input
Would like up to 1 amp
A drawing and parts would help a lot.
As only basic understanding. Thanks in advance

 

I need a circuit to reduce the 20 to 24v to run the pic axe and not fluctuate on input

Hi lv,
Welcome to AAC.
Is the 20 to 24v a typo.?
E

EDIT:
These would suitable.
https://www.amazon.co.uk/s/ref=nb_sb_noss_2?url=search-alias=aps&field-keywords=DC+buck+converter

 

Hi lv,
Welcome to AAC.
Is the 20 to 24v a typo.?
E

Hi
I thought 20 to 24v for when battery gets low.. and still want 4.5
I don’t really want to buy something. Want to fit parts to board with my relays etc.

 

hi,
If you don't want to buy something, we need to know what parts you have, so that we can suggest a circuit.

 

Do you have a car cigarette socket phone charger or similar?
Some of those can run on 24V as well as 12V. That could be a start. You can often find them at garage sales and OpShops.
But an Ebay buck converter for less that $1 is really pretty hard to beat.

 

hi,
If you don't want to buy something, we need to know what parts you have, so that we can suggest a circuit.

I don’t have any parts I can purchase all if I know what I need. Then put to pcb

 

hi,
Dropping from 24V to say 5V at 1Amp, using a linear voltage regulator would be very inefficient also it would mean dissipating ~19Watts!.
So a switching regulator would be the way to go.
I would recommend that you reconsider a ready built module, it would be cheaper and quicker to get into operation

E

 

Just one month ago I took one of those phone chargers apart. The kind that plug into the cigarette power outlet. Modified the reference voltage to drop the 5 volts output to give me 3 volts. Works like a champ. Didn't have to buy anything. Just used junk I have been accumulating.

To be honest, I think Dendad has the best advice. Yes, you don't want to buy. But I just don't see anything being easier. And fully adjustable (some of them are). You could dial in the exact voltage you want. And the amperage is there too.

 

For an example...
https://www.ebay.com.au/itm/1-2-5-1...m=191947937795&_trksid=p2047675.c100005.m1851

 

If you can tap into the battery pack at the first cell from the negative that should give you around 4 + volts and with a bit of filtering that should be fine. Hopefully you have a meter to verify the voltage. That is the simplest and most efficient way to get the voltage that you asked for.