This xenon flasher version for the power grid is from an 80's EDN. The circuit uses a folder and a pulse transformer to trigger the lamp. C1 determines the intensity of the pulses.
The CMOS TLC555 [equivalent to the bipolar 555] can be used as a monostable in the configuration...
This very simple circuit must use coal microphones of the type found in very old equipment. The...
This circuit was found in an English publication from the 70's. The circuit requires symmetrical...