[Libre-soc-dev] daily kan-ban update 11mar2022

[Jacob Lifshay]

On Sun, Mar 13, 2022, 03:33 Luke Kenneth Casson Leighton <lkcl at lkcl.net>
wrote:

> ---
> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>
>
> On Sun, Mar 13, 2022 at 10:16 AM Jacob Lifshay <programmerjake at gmail.com>
> wrote:
>
>
> > i am planning on using 2 npn transistors per direction and some 1k (or
> > something) resistors. RTL (resistor-transistor-logic) to the rescue!
> >
>
>
> https://electronics.stackexchange.com/questions/329810/how-can-a-switching-diode-act-as-a-level-shifter
>
> resistor.  diode.  done.  note that the diodes point *from* receive *to*
> transmit!!
>

that's insufficient for my use-case, since you have to hope that 3.3V is
high enough voltage to make my 5V usb serial adaptor think it's a high
(probably works only if the input is ttl compatible). remember this is
bidirectional.

Jacob