Single push-pull amplifier with cross over compensation

This is just going to be a quick one. Double push-pull amplifier with cross over compensation explained a high-power amplifier circuit which creates a balance point and corrects for cross over. A much simpler version of the circuit depends on two equal voltage sources creating that 0V balance point, so it used a single push-pull … Continue reading Single push-pull amplifier with cross over compensation

Mysql: the definition of table prevents operation … on table

This is a tricky one affecting MySql table updates which have views. Documentation about this error actually explains the cause, but doesn't connect the dots. I have a view V on table T and want to delete some rows from T. That works fine as long as the DELETE statement doesn't involve the view, so … Continue reading Mysql: the definition of table prevents operation … on table

Ubuntu 20.04 getting wrong IP address

Yesterday (early August 2021) my Ubuntu 20.04 installation started configuring all network interfaces (wifi, ethernet) with IPv4 addresses from the wrong network segment block, namely 192.168.0.x. IPv6 still worked fine. I didn't figure out whether that's due to a change in the router or the OS (I suspect the router, because the situation improved when … Continue reading Ubuntu 20.04 getting wrong IP address