An article in Radio Electronics magazine from November 1958 showed the construction of this tube audio oscillator. Note the use of lamps as a stabilizer to obtain better sinusoidal signals.
This is a typical application circuit of a 565 PLL. The circuit is suitable for selecting a 67 kHz...
Mouser Electronics already has in stock the new RF transceivers Atmel / Microchip ATA8820 SIGFOX ™ for...
The frequency of this circuit is approximately 1 Hz. Whenever the output is at low level, the LED...