This circuit that converts voltages from a battery into high voltages for tube circuits was found in Radio Electronics magazine from February 1960. The transformer is of a special type.
This low frequency circuit was found in documentation from the 1980s. The values of R and C...
This source for devices for automotive use was found in a 1985 documentation. The power...
Found on Popular Electronics in the 1980s, this circuit detects a change in air pressure using a...