This circuit was found in Motorola documentation from 1966. The lamps are according to power and current according to the components used which are uncommon today.
August 2017 - Mouser Electronics is announcing the availability of TDK ICS-52000 microphones with...
This circuit was obtained from a 1986 Spanish magazine Resistor. The magazine no longer exists, but...
This comparator application circuit was obtained from the June 1986 Radio Electronics magazine. The...