1.5 v to 3v and 5v? Really confused.

[mvs_sarma]

Check whether the Receiver will not work at 3V, ?
if so the problem is simplified and you can have three cells at 1.5 each and have a LM1117-3.3 as a regulator for both Tx and Rx

[kevj]

Thank you Sarma-

Unfortunately the receiver will only run down to 4v, I've already called the manufacturer to verify this.

And again, I don't have room for 3 cells - I've only got room for 1 cell and not a bit more. I wish it was as easy as just adding a couple more cells.

[T.Jackson]

The TC7662B looks good. Might try one out one of these days. No inductors to wind yippee!

[Acetronics2]

Hi, Kevj

I have some R/C designs that need 5v from 4 NiCd cells ...

so, I've used the MAX 879 ( converter/regulator ) ... was fine, but out of production now .


Now, I Use a MAX 630 Upconverter ... 641 if you need more power, and a LM2940 LDO ...

Inductors are Std ones ... no soucy !!!

Alain

[BobP]

Hi,

Have you thought of using a Lithium battery? We use a 'AA' size but there may be a 'AAA'.

Good bit is they are 3.4 volts and have a very good capacity. Bad points, price and disposal....

Bob

[ronsimpson]

The MAX856 and 858 come in 8-dip. The Max 856/858 has a pin to select 3 or 5 volts out. Cannot be much simpler. Vin 0.8 to 3 volts and 3.3 or 5 out.