This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a gas lamp of the time.
This circuit can be used as a shield for microcontrollers. The circuit is from American...
This 80's circuit has been winning. It is a 1 000 gain sample and hold circuit and an offset...
This watt meter was found in an old telecommunications documentation. The circuit is interspersed...