Hi, I bought a GPSDO. It outputs somewhere around 3V. This is connected to a picdiv and then to a raspberry pi. The picdiv is happy with 3.3v, the rpi as well. All good.
Now I bought a "Square Wave Amplifier" by BG7TBL ( https://www.aliexpress.com/item/4000192799858.html?gatewayAdapt=glo2nld&spm=a2g0o.9042311.0.0.3d764c4dMZPAX8 ). Documentation I could find was a bit vague about the output voltage but I measured 5v with a scope (see https://vanheusden.com/permshare/scope.png - the scope software says 2MHz but output is really 10MHz). I did not study electronics, am only a electronics-hobbyist so bare with me when this is a dumb question. The RPI doesn't like 5v on its GPIO pins. So I wonder: - can I feed the picdiv 5v on its GPIO pin while giving it a 3.3v voltage so that it outputs 3.3v as well to the rpi pins? - or should I use a voltage divider? I was thinking of a 4.7k ohm and 8.2k ohm resistor giving slightly less than 3.2v - will that work? or will that attenuate the signal too much? The 50 ohm bnc cable between the amplifier and the rpi is 3m long. Anything else I should be aware of? Regards, Folkert van Heusden PD9FVH _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.