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 simple bridge circuit can be used for impedance or resistance measurement using a high...
This circuit can source up to 1,000 V from a 9 V battery. Output current is very low, some...
The figure shows how to change the frequency of a 5 V LED blinking. The capacitor can have other...