This circuit of the 80s makes use of an operational one of the time. It can be designed with modern operationals and must use a symmetrical power supply.
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...