This circuit was found in the September 1984 issue of Radio Electronics magazine. The frequency is given by the capacitors. The diodes help in the starting process.
This configuration with complementary transistors causes an LED to flash at a frequency that is...
June 2017 - Mouser Electronics already has to ship the new MC Crystal Real Time Crystal Modules...
This amplifier was found in a 1957 Rayrtheon documentation. The circuit can be fitted with a BC558...