This variable frequency oscillator with the 4093 was found in a Popular Electronics from the 90s. The table gives the component values for various frequency ranges.
This oscillator, from a 1978 amateur radio manual, can oscillate in frequencies from 2 to 22 MHz...
The purpose of this circuit is to determine from the position of the float which of the pumps...
This circuit uses two operational amplifiers, which can be of the type 741, in a full wave...