[Ronja] Twister2 power problem

[Bruce M Simpson]

Karel Kulhavy wrote:
>> I just looked at the LM2671 data sheet and I see that it seems to be 
>> very, very picky about the inductors which it needs.
>>
>> I haven't, unfortunately, been able to obtain the exact parts in the 
>> Twister2 BoM here in the UK. I have mostly been sourcing parts through 
>> Farnell, however it looks like RS have a number of parts which they don't.
>>     
>
> So what did you put there instead? How much inductance?
>   

Before I looked at the 'sheet, I tried a straight through jumper, and a 
premanufactured 100uH coil which I've been using for the RF suppression 
on the Twister1, TX and RX modules.

The square SMD inductors on the BoM weren't available from Farnell. I 
believe they may be available from RS, so I'm saving up back-orders for 
the next time I go shopping. However none of the big guys here seem to 
have SOIC 74HC164...

Haven't checked for output shorts yet...

Yesterday I cut the 316L steel with the jigsaw I picked up the day 
before OK. Bending it to fit the modules is a PITA for sure, I embedded 
a TX module in a piece of 110mm drain pipe, and fixed the 100mm loupe in 
place with plumber's putty and hot glue.

I need to go back to software land for a bit, so progress on this is 
slowing down.

This is pretty much the only thing holding me back at the moment. The RX 
module I produced with Ondrej's SMD design and a laser printer works OK, 
but I'm out of etchant, and Maplin never seem to have ferric chloride in 
stock.

cheers
BMS