This adjustable frequency circuit was found in December 1986, Radio Electronics magazine. The base frequency is given by C1 and the power supply must be 5 V.
This circuit was found in a 1967 publication. Transistors can be modern general purpose. Component...
This circuit was found in an 80's Radio Electronics. The circuit multiplies the frequency of a low...
This flasher for power loads such as lamps and LEDs uses a 555 as an oscillator. The supply...