This flasher or light pulsator can be used in an ordinary flashlight. The circuit can be adapted to use a lamp instead of an LED. Transistors support equivalents. C1 determines the frequency range.
This circuit is from old documentation. The operational amplifier is uncommon nowadays. The...
The circuit shown was found in a Japanese publication from the 1960s. Transistors can be...
This oscillator can generate signals from 100 kHz to more than 50 MHz depending on the crystal used...